155 lines
6.9 KiB
Python
155 lines
6.9 KiB
Python
from django.db.models.lookups import (
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Exact, GreaterThan, GreaterThanOrEqual, In, IsNull, LessThan,
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LessThanOrEqual,
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)
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class MultiColSource:
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contains_aggregate = False
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def __init__(self, alias, targets, sources, field):
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self.targets, self.sources, self.field, self.alias = targets, sources, field, alias
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self.output_field = self.field
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def __repr__(self):
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return "{}({}, {})".format(
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self.__class__.__name__, self.alias, self.field)
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def relabeled_clone(self, relabels):
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return self.__class__(relabels.get(self.alias, self.alias),
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self.targets, self.sources, self.field)
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def get_lookup(self, lookup):
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return self.output_field.get_lookup(lookup)
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def get_normalized_value(value, lhs):
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from django.db.models import Model
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if isinstance(value, Model):
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value_list = []
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sources = lhs.output_field.get_path_info()[-1].target_fields
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for source in sources:
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while not isinstance(value, source.model) and source.remote_field:
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source = source.remote_field.model._meta.get_field(source.remote_field.field_name)
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try:
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value_list.append(getattr(value, source.attname))
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except AttributeError:
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# A case like Restaurant.objects.filter(place=restaurant_instance),
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# where place is a OneToOneField and the primary key of Restaurant.
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return (value.pk,)
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return tuple(value_list)
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if not isinstance(value, tuple):
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return (value,)
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return value
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class RelatedIn(In):
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def get_prep_lookup(self):
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if not isinstance(self.lhs, MultiColSource) and self.rhs_is_direct_value():
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# If we get here, we are dealing with single-column relations.
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self.rhs = [get_normalized_value(val, self.lhs)[0] for val in self.rhs]
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# We need to run the related field's get_prep_value(). Consider case
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# ForeignKey to IntegerField given value 'abc'. The ForeignKey itself
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# doesn't have validation for non-integers, so we must run validation
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# using the target field.
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if hasattr(self.lhs.output_field, 'get_path_info'):
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# Run the target field's get_prep_value. We can safely assume there is
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# only one as we don't get to the direct value branch otherwise.
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target_field = self.lhs.output_field.get_path_info()[-1].target_fields[-1]
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self.rhs = [target_field.get_prep_value(v) for v in self.rhs]
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return super().get_prep_lookup()
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def as_sql(self, compiler, connection):
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if isinstance(self.lhs, MultiColSource):
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# For multicolumn lookups we need to build a multicolumn where clause.
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# This clause is either a SubqueryConstraint (for values that need to be compiled to
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# SQL) or an OR-combined list of (col1 = val1 AND col2 = val2 AND ...) clauses.
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from django.db.models.sql.where import WhereNode, SubqueryConstraint, AND, OR
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root_constraint = WhereNode(connector=OR)
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if self.rhs_is_direct_value():
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values = [get_normalized_value(value, self.lhs) for value in self.rhs]
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for value in values:
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value_constraint = WhereNode()
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for source, target, val in zip(self.lhs.sources, self.lhs.targets, value):
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lookup_class = target.get_lookup('exact')
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lookup = lookup_class(target.get_col(self.lhs.alias, source), val)
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value_constraint.add(lookup, AND)
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root_constraint.add(value_constraint, OR)
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else:
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root_constraint.add(
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SubqueryConstraint(
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self.lhs.alias, [target.column for target in self.lhs.targets],
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[source.name for source in self.lhs.sources], self.rhs),
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AND)
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return root_constraint.as_sql(compiler, connection)
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else:
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if (not getattr(self.rhs, 'has_select_fields', True) and
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not getattr(self.lhs.field.target_field, 'primary_key', False)):
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self.rhs.clear_select_clause()
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if (getattr(self.lhs.output_field, 'primary_key', False) and
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self.lhs.output_field.model == self.rhs.model):
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# A case like Restaurant.objects.filter(place__in=restaurant_qs),
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# where place is a OneToOneField and the primary key of
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# Restaurant.
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target_field = self.lhs.field.name
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else:
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target_field = self.lhs.field.target_field.name
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self.rhs.add_fields([target_field], True)
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return super().as_sql(compiler, connection)
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class RelatedLookupMixin:
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def get_prep_lookup(self):
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if not isinstance(self.lhs, MultiColSource) and self.rhs_is_direct_value():
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# If we get here, we are dealing with single-column relations.
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self.rhs = get_normalized_value(self.rhs, self.lhs)[0]
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# We need to run the related field's get_prep_value(). Consider case
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# ForeignKey to IntegerField given value 'abc'. The ForeignKey itself
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# doesn't have validation for non-integers, so we must run validation
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# using the target field.
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if self.prepare_rhs and hasattr(self.lhs.output_field, 'get_path_info'):
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# Get the target field. We can safely assume there is only one
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# as we don't get to the direct value branch otherwise.
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target_field = self.lhs.output_field.get_path_info()[-1].target_fields[-1]
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self.rhs = target_field.get_prep_value(self.rhs)
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return super().get_prep_lookup()
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def as_sql(self, compiler, connection):
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if isinstance(self.lhs, MultiColSource):
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assert self.rhs_is_direct_value()
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self.rhs = get_normalized_value(self.rhs, self.lhs)
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from django.db.models.sql.where import WhereNode, AND
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root_constraint = WhereNode()
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for target, source, val in zip(self.lhs.targets, self.lhs.sources, self.rhs):
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lookup_class = target.get_lookup(self.lookup_name)
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root_constraint.add(
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lookup_class(target.get_col(self.lhs.alias, source), val), AND)
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return root_constraint.as_sql(compiler, connection)
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return super().as_sql(compiler, connection)
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class RelatedExact(RelatedLookupMixin, Exact):
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pass
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class RelatedLessThan(RelatedLookupMixin, LessThan):
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pass
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class RelatedGreaterThan(RelatedLookupMixin, GreaterThan):
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pass
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class RelatedGreaterThanOrEqual(RelatedLookupMixin, GreaterThanOrEqual):
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pass
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class RelatedLessThanOrEqual(RelatedLookupMixin, LessThanOrEqual):
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pass
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class RelatedIsNull(RelatedLookupMixin, IsNull):
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pass
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