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1291 lines
46 KiB
1291 lines
46 KiB
# orm/dependency.py
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# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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"""Relationship dependencies.
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"""
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from . import attributes
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from . import exc
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from . import sync
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from . import unitofwork
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from . import util as mapperutil
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from .interfaces import MANYTOMANY
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from .interfaces import MANYTOONE
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from .interfaces import ONETOMANY
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from .. import exc as sa_exc
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from .. import sql
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from .. import util
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class DependencyProcessor(object):
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def __init__(self, prop):
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self.prop = prop
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self.cascade = prop.cascade
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self.mapper = prop.mapper
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self.parent = prop.parent
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self.secondary = prop.secondary
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self.direction = prop.direction
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self.post_update = prop.post_update
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self.passive_deletes = prop.passive_deletes
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self.passive_updates = prop.passive_updates
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self.enable_typechecks = prop.enable_typechecks
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if self.passive_deletes:
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self._passive_delete_flag = attributes.PASSIVE_NO_INITIALIZE
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else:
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self._passive_delete_flag = attributes.PASSIVE_OFF
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if self.passive_updates:
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self._passive_update_flag = attributes.PASSIVE_NO_INITIALIZE
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else:
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self._passive_update_flag = attributes.PASSIVE_OFF
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self.sort_key = "%s_%s" % (self.parent._sort_key, prop.key)
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self.key = prop.key
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if not self.prop.synchronize_pairs:
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raise sa_exc.ArgumentError(
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"Can't build a DependencyProcessor for relationship %s. "
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"No target attributes to populate between parent and "
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"child are present" % self.prop
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)
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@classmethod
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def from_relationship(cls, prop):
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return _direction_to_processor[prop.direction](prop)
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def hasparent(self, state):
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"""return True if the given object instance has a parent,
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according to the ``InstrumentedAttribute`` handled by this
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``DependencyProcessor``.
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"""
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return self.parent.class_manager.get_impl(self.key).hasparent(state)
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def per_property_preprocessors(self, uow):
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"""establish actions and dependencies related to a flush.
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These actions will operate on all relevant states in
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the aggregate.
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"""
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uow.register_preprocessor(self, True)
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def per_property_flush_actions(self, uow):
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after_save = unitofwork.ProcessAll(uow, self, False, True)
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before_delete = unitofwork.ProcessAll(uow, self, True, True)
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parent_saves = unitofwork.SaveUpdateAll(
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uow, self.parent.primary_base_mapper
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)
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child_saves = unitofwork.SaveUpdateAll(
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uow, self.mapper.primary_base_mapper
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)
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parent_deletes = unitofwork.DeleteAll(
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uow, self.parent.primary_base_mapper
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)
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child_deletes = unitofwork.DeleteAll(
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uow, self.mapper.primary_base_mapper
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)
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self.per_property_dependencies(
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uow,
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parent_saves,
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child_saves,
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parent_deletes,
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child_deletes,
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after_save,
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before_delete,
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)
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def per_state_flush_actions(self, uow, states, isdelete):
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"""establish actions and dependencies related to a flush.
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These actions will operate on all relevant states
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individually. This occurs only if there are cycles
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in the 'aggregated' version of events.
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"""
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child_base_mapper = self.mapper.primary_base_mapper
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child_saves = unitofwork.SaveUpdateAll(uow, child_base_mapper)
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child_deletes = unitofwork.DeleteAll(uow, child_base_mapper)
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# locate and disable the aggregate processors
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# for this dependency
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if isdelete:
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before_delete = unitofwork.ProcessAll(uow, self, True, True)
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before_delete.disabled = True
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else:
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after_save = unitofwork.ProcessAll(uow, self, False, True)
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after_save.disabled = True
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# check if the "child" side is part of the cycle
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if child_saves not in uow.cycles:
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# based on the current dependencies we use, the saves/
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# deletes should always be in the 'cycles' collection
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# together. if this changes, we will have to break up
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# this method a bit more.
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assert child_deletes not in uow.cycles
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# child side is not part of the cycle, so we will link per-state
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# actions to the aggregate "saves", "deletes" actions
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child_actions = [(child_saves, False), (child_deletes, True)]
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child_in_cycles = False
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else:
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child_in_cycles = True
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# check if the "parent" side is part of the cycle
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if not isdelete:
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parent_saves = unitofwork.SaveUpdateAll(
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uow, self.parent.base_mapper
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)
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parent_deletes = before_delete = None
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if parent_saves in uow.cycles:
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parent_in_cycles = True
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else:
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parent_deletes = unitofwork.DeleteAll(uow, self.parent.base_mapper)
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parent_saves = after_save = None
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if parent_deletes in uow.cycles:
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parent_in_cycles = True
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# now create actions /dependencies for each state.
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for state in states:
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# detect if there's anything changed or loaded
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# by a preprocessor on this state/attribute. In the
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# case of deletes we may try to load missing items here as well.
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sum_ = state.manager[self.key].impl.get_all_pending(
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state,
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state.dict,
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self._passive_delete_flag
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if isdelete
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else attributes.PASSIVE_NO_INITIALIZE,
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)
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if not sum_:
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continue
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if isdelete:
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before_delete = unitofwork.ProcessState(uow, self, True, state)
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if parent_in_cycles:
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parent_deletes = unitofwork.DeleteState(uow, state)
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else:
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after_save = unitofwork.ProcessState(uow, self, False, state)
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if parent_in_cycles:
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parent_saves = unitofwork.SaveUpdateState(uow, state)
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if child_in_cycles:
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child_actions = []
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for child_state, child in sum_:
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if child_state not in uow.states:
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child_action = (None, None)
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else:
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(deleted, listonly) = uow.states[child_state]
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if deleted:
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child_action = (
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unitofwork.DeleteState(uow, child_state),
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True,
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)
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else:
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child_action = (
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unitofwork.SaveUpdateState(uow, child_state),
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False,
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)
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child_actions.append(child_action)
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# establish dependencies between our possibly per-state
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# parent action and our possibly per-state child action.
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for child_action, childisdelete in child_actions:
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self.per_state_dependencies(
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uow,
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parent_saves,
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parent_deletes,
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child_action,
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after_save,
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before_delete,
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isdelete,
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childisdelete,
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)
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def presort_deletes(self, uowcommit, states):
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return False
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def presort_saves(self, uowcommit, states):
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return False
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def process_deletes(self, uowcommit, states):
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pass
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def process_saves(self, uowcommit, states):
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pass
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def prop_has_changes(self, uowcommit, states, isdelete):
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if not isdelete or self.passive_deletes:
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passive = attributes.PASSIVE_NO_INITIALIZE
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elif self.direction is MANYTOONE:
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# here, we were hoping to optimize having to fetch many-to-one
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# for history and ignore it, if there's no further cascades
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# to take place. however there are too many less common conditions
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# that still take place and tests in test_relationships /
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# test_cascade etc. will still fail.
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passive = attributes.PASSIVE_NO_FETCH_RELATED
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else:
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passive = attributes.PASSIVE_OFF
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for s in states:
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# TODO: add a high speed method
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# to InstanceState which returns: attribute
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# has a non-None value, or had one
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history = uowcommit.get_attribute_history(s, self.key, passive)
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if history and not history.empty():
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return True
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else:
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return (
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states
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and not self.prop._is_self_referential
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and self.mapper in uowcommit.mappers
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)
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def _verify_canload(self, state):
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if self.prop.uselist and state is None:
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raise exc.FlushError(
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"Can't flush None value found in "
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"collection %s" % (self.prop,)
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)
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elif state is not None and not self.mapper._canload(
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state, allow_subtypes=not self.enable_typechecks
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):
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if self.mapper._canload(state, allow_subtypes=True):
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raise exc.FlushError(
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"Attempting to flush an item of type "
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"%(x)s as a member of collection "
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'"%(y)s". Expected an object of type '
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"%(z)s or a polymorphic subclass of "
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"this type. If %(x)s is a subclass of "
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'%(z)s, configure mapper "%(zm)s" to '
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"load this subtype polymorphically, or "
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"set enable_typechecks=False to allow "
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"any subtype to be accepted for flush. "
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% {
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"x": state.class_,
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"y": self.prop,
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"z": self.mapper.class_,
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"zm": self.mapper,
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}
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)
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else:
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raise exc.FlushError(
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"Attempting to flush an item of type "
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"%(x)s as a member of collection "
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'"%(y)s". Expected an object of type '
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"%(z)s or a polymorphic subclass of "
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"this type."
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% {
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"x": state.class_,
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"y": self.prop,
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"z": self.mapper.class_,
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}
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)
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def _synchronize(self, state, child, associationrow, clearkeys, uowcommit):
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raise NotImplementedError()
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def _get_reversed_processed_set(self, uow):
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if not self.prop._reverse_property:
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return None
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process_key = tuple(
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sorted([self.key] + [p.key for p in self.prop._reverse_property])
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)
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return uow.memo(("reverse_key", process_key), set)
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def _post_update(self, state, uowcommit, related, is_m2o_delete=False):
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for x in related:
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if not is_m2o_delete or x is not None:
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uowcommit.register_post_update(
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state, [r for l, r in self.prop.synchronize_pairs]
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)
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break
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def _pks_changed(self, uowcommit, state):
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raise NotImplementedError()
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def __repr__(self):
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return "%s(%s)" % (self.__class__.__name__, self.prop)
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class OneToManyDP(DependencyProcessor):
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def per_property_dependencies(
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self,
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uow,
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parent_saves,
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child_saves,
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parent_deletes,
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child_deletes,
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after_save,
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before_delete,
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):
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if self.post_update:
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child_post_updates = unitofwork.PostUpdateAll(
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uow, self.mapper.primary_base_mapper, False
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)
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child_pre_updates = unitofwork.PostUpdateAll(
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uow, self.mapper.primary_base_mapper, True
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)
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uow.dependencies.update(
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[
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(child_saves, after_save),
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(parent_saves, after_save),
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(after_save, child_post_updates),
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(before_delete, child_pre_updates),
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(child_pre_updates, parent_deletes),
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(child_pre_updates, child_deletes),
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]
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)
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else:
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uow.dependencies.update(
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[
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(parent_saves, after_save),
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(after_save, child_saves),
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(after_save, child_deletes),
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(child_saves, parent_deletes),
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(child_deletes, parent_deletes),
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(before_delete, child_saves),
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(before_delete, child_deletes),
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]
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)
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def per_state_dependencies(
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self,
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uow,
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save_parent,
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delete_parent,
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child_action,
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after_save,
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before_delete,
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isdelete,
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childisdelete,
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):
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if self.post_update:
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child_post_updates = unitofwork.PostUpdateAll(
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uow, self.mapper.primary_base_mapper, False
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)
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child_pre_updates = unitofwork.PostUpdateAll(
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uow, self.mapper.primary_base_mapper, True
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)
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# TODO: this whole block is not covered
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# by any tests
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if not isdelete:
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if childisdelete:
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uow.dependencies.update(
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[
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(child_action, after_save),
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(after_save, child_post_updates),
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]
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)
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else:
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uow.dependencies.update(
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[
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(save_parent, after_save),
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(child_action, after_save),
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(after_save, child_post_updates),
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]
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)
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else:
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if childisdelete:
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uow.dependencies.update(
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[
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(before_delete, child_pre_updates),
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(child_pre_updates, delete_parent),
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]
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)
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else:
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uow.dependencies.update(
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[
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(before_delete, child_pre_updates),
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(child_pre_updates, delete_parent),
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]
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)
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elif not isdelete:
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uow.dependencies.update(
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[
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(save_parent, after_save),
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(after_save, child_action),
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(save_parent, child_action),
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]
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)
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else:
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uow.dependencies.update(
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[(before_delete, child_action), (child_action, delete_parent)]
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)
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def presort_deletes(self, uowcommit, states):
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# head object is being deleted, and we manage its list of
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# child objects the child objects have to have their
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# foreign key to the parent set to NULL
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should_null_fks = (
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not self.cascade.delete and not self.passive_deletes == "all"
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)
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|
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for state in states:
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history = uowcommit.get_attribute_history(
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state, self.key, self._passive_delete_flag
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)
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if history:
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for child in history.deleted:
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if child is not None and self.hasparent(child) is False:
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if self.cascade.delete_orphan:
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uowcommit.register_object(child, isdelete=True)
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else:
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uowcommit.register_object(child)
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if should_null_fks:
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for child in history.unchanged:
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if child is not None:
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uowcommit.register_object(
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child, operation="delete", prop=self.prop
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)
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def presort_saves(self, uowcommit, states):
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children_added = uowcommit.memo(("children_added", self), set)
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|
should_null_fks = (
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not self.cascade.delete_orphan
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and not self.passive_deletes == "all"
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)
|
|
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for state in states:
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pks_changed = self._pks_changed(uowcommit, state)
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if not pks_changed or self.passive_updates:
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passive = attributes.PASSIVE_NO_INITIALIZE
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else:
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passive = attributes.PASSIVE_OFF
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|
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history = uowcommit.get_attribute_history(state, self.key, passive)
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if history:
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for child in history.added:
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if child is not None:
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uowcommit.register_object(
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child,
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cancel_delete=True,
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operation="add",
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prop=self.prop,
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)
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|
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children_added.update(history.added)
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|
for child in history.deleted:
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if not self.cascade.delete_orphan:
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if should_null_fks:
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uowcommit.register_object(
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child,
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isdelete=False,
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operation="delete",
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prop=self.prop,
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)
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elif self.hasparent(child) is False:
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|
uowcommit.register_object(
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child,
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isdelete=True,
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operation="delete",
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prop=self.prop,
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)
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for c, m, st_, dct_ in self.mapper.cascade_iterator(
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"delete", child
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):
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uowcommit.register_object(st_, isdelete=True)
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if pks_changed:
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if history:
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for child in history.unchanged:
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if child is not None:
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uowcommit.register_object(
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child,
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False,
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self.passive_updates,
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operation="pk change",
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prop=self.prop,
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)
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def process_deletes(self, uowcommit, states):
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|
# head object is being deleted, and we manage its list of
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|
# child objects the child objects have to have their foreign
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|
# key to the parent set to NULL this phase can be called
|
|
# safely for any cascade but is unnecessary if delete cascade
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|
# is on.
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|
|
if self.post_update or not self.passive_deletes == "all":
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children_added = uowcommit.memo(("children_added", self), set)
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for state in states:
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|
history = uowcommit.get_attribute_history(
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state, self.key, self._passive_delete_flag
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|
)
|
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if history:
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|
for child in history.deleted:
|
|
if (
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child is not None
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|
and self.hasparent(child) is False
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|
):
|
|
self._synchronize(
|
|
state, child, None, True, uowcommit, False
|
|
)
|
|
if self.post_update and child:
|
|
self._post_update(child, uowcommit, [state])
|
|
|
|
if self.post_update or not self.cascade.delete:
|
|
for child in set(history.unchanged).difference(
|
|
children_added
|
|
):
|
|
if child is not None:
|
|
self._synchronize(
|
|
state, child, None, True, uowcommit, False
|
|
)
|
|
if self.post_update and child:
|
|
self._post_update(
|
|
child, uowcommit, [state]
|
|
)
|
|
|
|
# technically, we can even remove each child from the
|
|
# collection here too. but this would be a somewhat
|
|
# inconsistent behavior since it wouldn't happen
|
|
# if the old parent wasn't deleted but child was moved.
|
|
|
|
def process_saves(self, uowcommit, states):
|
|
should_null_fks = (
|
|
not self.cascade.delete_orphan
|
|
and not self.passive_deletes == "all"
|
|
)
|
|
|
|
for state in states:
|
|
history = uowcommit.get_attribute_history(
|
|
state, self.key, attributes.PASSIVE_NO_INITIALIZE
|
|
)
|
|
if history:
|
|
for child in history.added:
|
|
self._synchronize(
|
|
state, child, None, False, uowcommit, False
|
|
)
|
|
if child is not None and self.post_update:
|
|
self._post_update(child, uowcommit, [state])
|
|
|
|
for child in history.deleted:
|
|
if (
|
|
should_null_fks
|
|
and not self.cascade.delete_orphan
|
|
and not self.hasparent(child)
|
|
):
|
|
self._synchronize(
|
|
state, child, None, True, uowcommit, False
|
|
)
|
|
|
|
if self._pks_changed(uowcommit, state):
|
|
for child in history.unchanged:
|
|
self._synchronize(
|
|
state, child, None, False, uowcommit, True
|
|
)
|
|
|
|
def _synchronize(
|
|
self, state, child, associationrow, clearkeys, uowcommit, pks_changed
|
|
):
|
|
source = state
|
|
dest = child
|
|
self._verify_canload(child)
|
|
if dest is None or (
|
|
not self.post_update and uowcommit.is_deleted(dest)
|
|
):
|
|
return
|
|
if clearkeys:
|
|
sync.clear(dest, self.mapper, self.prop.synchronize_pairs)
|
|
else:
|
|
sync.populate(
|
|
source,
|
|
self.parent,
|
|
dest,
|
|
self.mapper,
|
|
self.prop.synchronize_pairs,
|
|
uowcommit,
|
|
self.passive_updates and pks_changed,
|
|
)
|
|
|
|
def _pks_changed(self, uowcommit, state):
|
|
return sync.source_modified(
|
|
uowcommit, state, self.parent, self.prop.synchronize_pairs
|
|
)
|
|
|
|
|
|
class ManyToOneDP(DependencyProcessor):
|
|
def __init__(self, prop):
|
|
DependencyProcessor.__init__(self, prop)
|
|
for mapper in self.mapper.self_and_descendants:
|
|
mapper._dependency_processors.append(DetectKeySwitch(prop))
|
|
|
|
def per_property_dependencies(
|
|
self,
|
|
uow,
|
|
parent_saves,
|
|
child_saves,
|
|
parent_deletes,
|
|
child_deletes,
|
|
after_save,
|
|
before_delete,
|
|
):
|
|
|
|
if self.post_update:
|
|
parent_post_updates = unitofwork.PostUpdateAll(
|
|
uow, self.parent.primary_base_mapper, False
|
|
)
|
|
parent_pre_updates = unitofwork.PostUpdateAll(
|
|
uow, self.parent.primary_base_mapper, True
|
|
)
|
|
|
|
uow.dependencies.update(
|
|
[
|
|
(child_saves, after_save),
|
|
(parent_saves, after_save),
|
|
(after_save, parent_post_updates),
|
|
(after_save, parent_pre_updates),
|
|
(before_delete, parent_pre_updates),
|
|
(parent_pre_updates, child_deletes),
|
|
(parent_pre_updates, parent_deletes),
|
|
]
|
|
)
|
|
else:
|
|
uow.dependencies.update(
|
|
[
|
|
(child_saves, after_save),
|
|
(after_save, parent_saves),
|
|
(parent_saves, child_deletes),
|
|
(parent_deletes, child_deletes),
|
|
]
|
|
)
|
|
|
|
def per_state_dependencies(
|
|
self,
|
|
uow,
|
|
save_parent,
|
|
delete_parent,
|
|
child_action,
|
|
after_save,
|
|
before_delete,
|
|
isdelete,
|
|
childisdelete,
|
|
):
|
|
|
|
if self.post_update:
|
|
|
|
if not isdelete:
|
|
parent_post_updates = unitofwork.PostUpdateAll(
|
|
uow, self.parent.primary_base_mapper, False
|
|
)
|
|
if childisdelete:
|
|
uow.dependencies.update(
|
|
[
|
|
(after_save, parent_post_updates),
|
|
(parent_post_updates, child_action),
|
|
]
|
|
)
|
|
else:
|
|
uow.dependencies.update(
|
|
[
|
|
(save_parent, after_save),
|
|
(child_action, after_save),
|
|
(after_save, parent_post_updates),
|
|
]
|
|
)
|
|
else:
|
|
parent_pre_updates = unitofwork.PostUpdateAll(
|
|
uow, self.parent.primary_base_mapper, True
|
|
)
|
|
|
|
uow.dependencies.update(
|
|
[
|
|
(before_delete, parent_pre_updates),
|
|
(parent_pre_updates, delete_parent),
|
|
(parent_pre_updates, child_action),
|
|
]
|
|
)
|
|
|
|
elif not isdelete:
|
|
if not childisdelete:
|
|
uow.dependencies.update(
|
|
[(child_action, after_save), (after_save, save_parent)]
|
|
)
|
|
else:
|
|
uow.dependencies.update([(after_save, save_parent)])
|
|
|
|
else:
|
|
if childisdelete:
|
|
uow.dependencies.update([(delete_parent, child_action)])
|
|
|
|
def presort_deletes(self, uowcommit, states):
|
|
if self.cascade.delete or self.cascade.delete_orphan:
|
|
for state in states:
|
|
history = uowcommit.get_attribute_history(
|
|
state, self.key, self._passive_delete_flag
|
|
)
|
|
if history:
|
|
if self.cascade.delete_orphan:
|
|
todelete = history.sum()
|
|
else:
|
|
todelete = history.non_deleted()
|
|
for child in todelete:
|
|
if child is None:
|
|
continue
|
|
uowcommit.register_object(
|
|
child,
|
|
isdelete=True,
|
|
operation="delete",
|
|
prop=self.prop,
|
|
)
|
|
t = self.mapper.cascade_iterator("delete", child)
|
|
for c, m, st_, dct_ in t:
|
|
uowcommit.register_object(st_, isdelete=True)
|
|
|
|
def presort_saves(self, uowcommit, states):
|
|
for state in states:
|
|
uowcommit.register_object(state, operation="add", prop=self.prop)
|
|
if self.cascade.delete_orphan:
|
|
history = uowcommit.get_attribute_history(
|
|
state, self.key, self._passive_delete_flag
|
|
)
|
|
if history:
|
|
for child in history.deleted:
|
|
if self.hasparent(child) is False:
|
|
uowcommit.register_object(
|
|
child,
|
|
isdelete=True,
|
|
operation="delete",
|
|
prop=self.prop,
|
|
)
|
|
|
|
t = self.mapper.cascade_iterator("delete", child)
|
|
for c, m, st_, dct_ in t:
|
|
uowcommit.register_object(st_, isdelete=True)
|
|
|
|
def process_deletes(self, uowcommit, states):
|
|
if (
|
|
self.post_update
|
|
and not self.cascade.delete_orphan
|
|
and not self.passive_deletes == "all"
|
|
):
|
|
|
|
# post_update means we have to update our
|
|
# row to not reference the child object
|
|
# before we can DELETE the row
|
|
for state in states:
|
|
self._synchronize(state, None, None, True, uowcommit)
|
|
if state and self.post_update:
|
|
history = uowcommit.get_attribute_history(
|
|
state, self.key, self._passive_delete_flag
|
|
)
|
|
if history:
|
|
self._post_update(
|
|
state, uowcommit, history.sum(), is_m2o_delete=True
|
|
)
|
|
|
|
def process_saves(self, uowcommit, states):
|
|
for state in states:
|
|
history = uowcommit.get_attribute_history(
|
|
state, self.key, attributes.PASSIVE_NO_INITIALIZE
|
|
)
|
|
if history:
|
|
if history.added:
|
|
for child in history.added:
|
|
self._synchronize(
|
|
state, child, None, False, uowcommit, "add"
|
|
)
|
|
elif history.deleted:
|
|
self._synchronize(
|
|
state, None, None, True, uowcommit, "delete"
|
|
)
|
|
if self.post_update:
|
|
self._post_update(state, uowcommit, history.sum())
|
|
|
|
def _synchronize(
|
|
self,
|
|
state,
|
|
child,
|
|
associationrow,
|
|
clearkeys,
|
|
uowcommit,
|
|
operation=None,
|
|
):
|
|
if state is None or (
|
|
not self.post_update and uowcommit.is_deleted(state)
|
|
):
|
|
return
|
|
|
|
if (
|
|
operation is not None
|
|
and child is not None
|
|
and not uowcommit.session._contains_state(child)
|
|
):
|
|
util.warn(
|
|
"Object of type %s not in session, %s "
|
|
"operation along '%s' won't proceed"
|
|
% (mapperutil.state_class_str(child), operation, self.prop)
|
|
)
|
|
return
|
|
|
|
if clearkeys or child is None:
|
|
sync.clear(state, self.parent, self.prop.synchronize_pairs)
|
|
else:
|
|
self._verify_canload(child)
|
|
sync.populate(
|
|
child,
|
|
self.mapper,
|
|
state,
|
|
self.parent,
|
|
self.prop.synchronize_pairs,
|
|
uowcommit,
|
|
False,
|
|
)
|
|
|
|
|
|
class DetectKeySwitch(DependencyProcessor):
|
|
"""For many-to-one relationships with no one-to-many backref,
|
|
searches for parents through the unit of work when a primary
|
|
key has changed and updates them.
|
|
|
|
Theoretically, this approach could be expanded to support transparent
|
|
deletion of objects referenced via many-to-one as well, although
|
|
the current attribute system doesn't do enough bookkeeping for this
|
|
to be efficient.
|
|
|
|
"""
|
|
|
|
def per_property_preprocessors(self, uow):
|
|
if self.prop._reverse_property:
|
|
if self.passive_updates:
|
|
return
|
|
else:
|
|
if False in (
|
|
prop.passive_updates
|
|
for prop in self.prop._reverse_property
|
|
):
|
|
return
|
|
|
|
uow.register_preprocessor(self, False)
|
|
|
|
def per_property_flush_actions(self, uow):
|
|
parent_saves = unitofwork.SaveUpdateAll(uow, self.parent.base_mapper)
|
|
after_save = unitofwork.ProcessAll(uow, self, False, False)
|
|
uow.dependencies.update([(parent_saves, after_save)])
|
|
|
|
def per_state_flush_actions(self, uow, states, isdelete):
|
|
pass
|
|
|
|
def presort_deletes(self, uowcommit, states):
|
|
pass
|
|
|
|
def presort_saves(self, uow, states):
|
|
if not self.passive_updates:
|
|
# for non-passive updates, register in the preprocess stage
|
|
# so that mapper save_obj() gets a hold of changes
|
|
self._process_key_switches(states, uow)
|
|
|
|
def prop_has_changes(self, uow, states, isdelete):
|
|
if not isdelete and self.passive_updates:
|
|
d = self._key_switchers(uow, states)
|
|
return bool(d)
|
|
|
|
return False
|
|
|
|
def process_deletes(self, uowcommit, states):
|
|
assert False
|
|
|
|
def process_saves(self, uowcommit, states):
|
|
# for passive updates, register objects in the process stage
|
|
# so that we avoid ManyToOneDP's registering the object without
|
|
# the listonly flag in its own preprocess stage (results in UPDATE)
|
|
# statements being emitted
|
|
assert self.passive_updates
|
|
self._process_key_switches(states, uowcommit)
|
|
|
|
def _key_switchers(self, uow, states):
|
|
switched, notswitched = uow.memo(
|
|
("pk_switchers", self), lambda: (set(), set())
|
|
)
|
|
|
|
allstates = switched.union(notswitched)
|
|
for s in states:
|
|
if s not in allstates:
|
|
if self._pks_changed(uow, s):
|
|
switched.add(s)
|
|
else:
|
|
notswitched.add(s)
|
|
return switched
|
|
|
|
def _process_key_switches(self, deplist, uowcommit):
|
|
switchers = self._key_switchers(uowcommit, deplist)
|
|
if switchers:
|
|
# if primary key values have actually changed somewhere, perform
|
|
# a linear search through the UOW in search of a parent.
|
|
for state in uowcommit.session.identity_map.all_states():
|
|
if not issubclass(state.class_, self.parent.class_):
|
|
continue
|
|
dict_ = state.dict
|
|
related = state.get_impl(self.key).get(
|
|
state, dict_, passive=self._passive_update_flag
|
|
)
|
|
if (
|
|
related is not attributes.PASSIVE_NO_RESULT
|
|
and related is not None
|
|
):
|
|
if self.prop.uselist:
|
|
if not related:
|
|
continue
|
|
related_obj = related[0]
|
|
else:
|
|
related_obj = related
|
|
related_state = attributes.instance_state(related_obj)
|
|
if related_state in switchers:
|
|
uowcommit.register_object(
|
|
state, False, self.passive_updates
|
|
)
|
|
sync.populate(
|
|
related_state,
|
|
self.mapper,
|
|
state,
|
|
self.parent,
|
|
self.prop.synchronize_pairs,
|
|
uowcommit,
|
|
self.passive_updates,
|
|
)
|
|
|
|
def _pks_changed(self, uowcommit, state):
|
|
return bool(state.key) and sync.source_modified(
|
|
uowcommit, state, self.mapper, self.prop.synchronize_pairs
|
|
)
|
|
|
|
|
|
class ManyToManyDP(DependencyProcessor):
|
|
def per_property_dependencies(
|
|
self,
|
|
uow,
|
|
parent_saves,
|
|
child_saves,
|
|
parent_deletes,
|
|
child_deletes,
|
|
after_save,
|
|
before_delete,
|
|
):
|
|
|
|
uow.dependencies.update(
|
|
[
|
|
(parent_saves, after_save),
|
|
(child_saves, after_save),
|
|
(after_save, child_deletes),
|
|
# a rowswitch on the parent from deleted to saved
|
|
# can make this one occur, as the "save" may remove
|
|
# an element from the
|
|
# "deleted" list before we have a chance to
|
|
# process its child rows
|
|
(before_delete, parent_saves),
|
|
(before_delete, parent_deletes),
|
|
(before_delete, child_deletes),
|
|
(before_delete, child_saves),
|
|
]
|
|
)
|
|
|
|
def per_state_dependencies(
|
|
self,
|
|
uow,
|
|
save_parent,
|
|
delete_parent,
|
|
child_action,
|
|
after_save,
|
|
before_delete,
|
|
isdelete,
|
|
childisdelete,
|
|
):
|
|
if not isdelete:
|
|
if childisdelete:
|
|
uow.dependencies.update(
|
|
[(save_parent, after_save), (after_save, child_action)]
|
|
)
|
|
else:
|
|
uow.dependencies.update(
|
|
[(save_parent, after_save), (child_action, after_save)]
|
|
)
|
|
else:
|
|
uow.dependencies.update(
|
|
[(before_delete, child_action), (before_delete, delete_parent)]
|
|
)
|
|
|
|
def presort_deletes(self, uowcommit, states):
|
|
# TODO: no tests fail if this whole
|
|
# thing is removed !!!!
|
|
if not self.passive_deletes:
|
|
# if no passive deletes, load history on
|
|
# the collection, so that prop_has_changes()
|
|
# returns True
|
|
for state in states:
|
|
uowcommit.get_attribute_history(
|
|
state, self.key, self._passive_delete_flag
|
|
)
|
|
|
|
def presort_saves(self, uowcommit, states):
|
|
if not self.passive_updates:
|
|
# if no passive updates, load history on
|
|
# each collection where parent has changed PK,
|
|
# so that prop_has_changes() returns True
|
|
for state in states:
|
|
if self._pks_changed(uowcommit, state):
|
|
history = uowcommit.get_attribute_history(
|
|
state, self.key, attributes.PASSIVE_OFF
|
|
)
|
|
|
|
if not self.cascade.delete_orphan:
|
|
return
|
|
|
|
# check for child items removed from the collection
|
|
# if delete_orphan check is turned on.
|
|
for state in states:
|
|
history = uowcommit.get_attribute_history(
|
|
state, self.key, attributes.PASSIVE_NO_INITIALIZE
|
|
)
|
|
if history:
|
|
for child in history.deleted:
|
|
if self.hasparent(child) is False:
|
|
uowcommit.register_object(
|
|
child,
|
|
isdelete=True,
|
|
operation="delete",
|
|
prop=self.prop,
|
|
)
|
|
for c, m, st_, dct_ in self.mapper.cascade_iterator(
|
|
"delete", child
|
|
):
|
|
uowcommit.register_object(st_, isdelete=True)
|
|
|
|
def process_deletes(self, uowcommit, states):
|
|
secondary_delete = []
|
|
secondary_insert = []
|
|
secondary_update = []
|
|
|
|
processed = self._get_reversed_processed_set(uowcommit)
|
|
tmp = set()
|
|
for state in states:
|
|
# this history should be cached already, as
|
|
# we loaded it in preprocess_deletes
|
|
history = uowcommit.get_attribute_history(
|
|
state, self.key, self._passive_delete_flag
|
|
)
|
|
if history:
|
|
for child in history.non_added():
|
|
if child is None or (
|
|
processed is not None and (state, child) in processed
|
|
):
|
|
continue
|
|
associationrow = {}
|
|
if not self._synchronize(
|
|
state,
|
|
child,
|
|
associationrow,
|
|
False,
|
|
uowcommit,
|
|
"delete",
|
|
):
|
|
continue
|
|
secondary_delete.append(associationrow)
|
|
|
|
tmp.update((c, state) for c in history.non_added())
|
|
|
|
if processed is not None:
|
|
processed.update(tmp)
|
|
|
|
self._run_crud(
|
|
uowcommit, secondary_insert, secondary_update, secondary_delete
|
|
)
|
|
|
|
def process_saves(self, uowcommit, states):
|
|
secondary_delete = []
|
|
secondary_insert = []
|
|
secondary_update = []
|
|
|
|
processed = self._get_reversed_processed_set(uowcommit)
|
|
tmp = set()
|
|
|
|
for state in states:
|
|
need_cascade_pks = not self.passive_updates and self._pks_changed(
|
|
uowcommit, state
|
|
)
|
|
if need_cascade_pks:
|
|
passive = attributes.PASSIVE_OFF
|
|
else:
|
|
passive = attributes.PASSIVE_NO_INITIALIZE
|
|
history = uowcommit.get_attribute_history(state, self.key, passive)
|
|
if history:
|
|
for child in history.added:
|
|
if processed is not None and (state, child) in processed:
|
|
continue
|
|
associationrow = {}
|
|
if not self._synchronize(
|
|
state, child, associationrow, False, uowcommit, "add"
|
|
):
|
|
continue
|
|
secondary_insert.append(associationrow)
|
|
for child in history.deleted:
|
|
if processed is not None and (state, child) in processed:
|
|
continue
|
|
associationrow = {}
|
|
if not self._synchronize(
|
|
state,
|
|
child,
|
|
associationrow,
|
|
False,
|
|
uowcommit,
|
|
"delete",
|
|
):
|
|
continue
|
|
secondary_delete.append(associationrow)
|
|
|
|
tmp.update((c, state) for c in history.added + history.deleted)
|
|
|
|
if need_cascade_pks:
|
|
|
|
for child in history.unchanged:
|
|
associationrow = {}
|
|
sync.update(
|
|
state,
|
|
self.parent,
|
|
associationrow,
|
|
"old_",
|
|
self.prop.synchronize_pairs,
|
|
)
|
|
sync.update(
|
|
child,
|
|
self.mapper,
|
|
associationrow,
|
|
"old_",
|
|
self.prop.secondary_synchronize_pairs,
|
|
)
|
|
|
|
secondary_update.append(associationrow)
|
|
|
|
if processed is not None:
|
|
processed.update(tmp)
|
|
|
|
self._run_crud(
|
|
uowcommit, secondary_insert, secondary_update, secondary_delete
|
|
)
|
|
|
|
def _run_crud(
|
|
self, uowcommit, secondary_insert, secondary_update, secondary_delete
|
|
):
|
|
connection = uowcommit.transaction.connection(self.mapper)
|
|
|
|
if secondary_delete:
|
|
associationrow = secondary_delete[0]
|
|
statement = self.secondary.delete().where(
|
|
sql.and_(
|
|
*[
|
|
c == sql.bindparam(c.key, type_=c.type)
|
|
for c in self.secondary.c
|
|
if c.key in associationrow
|
|
]
|
|
)
|
|
)
|
|
result = connection.execute(statement, secondary_delete)
|
|
|
|
if (
|
|
result.supports_sane_multi_rowcount()
|
|
) and result.rowcount != len(secondary_delete):
|
|
raise exc.StaleDataError(
|
|
"DELETE statement on table '%s' expected to delete "
|
|
"%d row(s); Only %d were matched."
|
|
% (
|
|
self.secondary.description,
|
|
len(secondary_delete),
|
|
result.rowcount,
|
|
)
|
|
)
|
|
|
|
if secondary_update:
|
|
associationrow = secondary_update[0]
|
|
statement = self.secondary.update().where(
|
|
sql.and_(
|
|
*[
|
|
c == sql.bindparam("old_" + c.key, type_=c.type)
|
|
for c in self.secondary.c
|
|
if c.key in associationrow
|
|
]
|
|
)
|
|
)
|
|
result = connection.execute(statement, secondary_update)
|
|
|
|
if (
|
|
result.supports_sane_multi_rowcount()
|
|
) and result.rowcount != len(secondary_update):
|
|
raise exc.StaleDataError(
|
|
"UPDATE statement on table '%s' expected to update "
|
|
"%d row(s); Only %d were matched."
|
|
% (
|
|
self.secondary.description,
|
|
len(secondary_update),
|
|
result.rowcount,
|
|
)
|
|
)
|
|
|
|
if secondary_insert:
|
|
statement = self.secondary.insert()
|
|
connection.execute(statement, secondary_insert)
|
|
|
|
def _synchronize(
|
|
self, state, child, associationrow, clearkeys, uowcommit, operation
|
|
):
|
|
|
|
# this checks for None if uselist=True
|
|
self._verify_canload(child)
|
|
|
|
# but if uselist=False we get here. If child is None,
|
|
# no association row can be generated, so return.
|
|
if child is None:
|
|
return False
|
|
|
|
if child is not None and not uowcommit.session._contains_state(child):
|
|
if not child.deleted:
|
|
util.warn(
|
|
"Object of type %s not in session, %s "
|
|
"operation along '%s' won't proceed"
|
|
% (mapperutil.state_class_str(child), operation, self.prop)
|
|
)
|
|
return False
|
|
|
|
sync.populate_dict(
|
|
state, self.parent, associationrow, self.prop.synchronize_pairs
|
|
)
|
|
sync.populate_dict(
|
|
child,
|
|
self.mapper,
|
|
associationrow,
|
|
self.prop.secondary_synchronize_pairs,
|
|
)
|
|
|
|
return True
|
|
|
|
def _pks_changed(self, uowcommit, state):
|
|
return sync.source_modified(
|
|
uowcommit, state, self.parent, self.prop.synchronize_pairs
|
|
)
|
|
|
|
|
|
_direction_to_processor = {
|
|
ONETOMANY: OneToManyDP,
|
|
MANYTOONE: ManyToOneDP,
|
|
MANYTOMANY: ManyToManyDP,
|
|
}
|