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Simplified calculation of used joins in Query.build_filter().

This commit is contained in:
Sergey Fedoseev 2017-08-11 19:46:11 +05:00 committed by Tim Graham
parent 68f0bcb012
commit 0ec134e340
1 changed files with 4 additions and 9 deletions
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13
django/db/models/sql/query.py
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@ -970,25 +970,18 @@ class Query:
return self.get_compiler(connection=connection).as_sql()
def resolve_lookup_value(self, value, can_reuse, allow_joins):
used_joins = set()
if hasattr(value, 'resolve_expression'):
pre_joins = self.alias_refcount.copy()
value = value.resolve_expression(self, reuse=can_reuse, allow_joins=allow_joins)
used_joins = {k for k, v in self.alias_refcount.items() if v > pre_joins.get(k, 0)}
elif isinstance(value, (list, tuple)):
# The items of the iterable may be expressions and therefore need
# to be resolved independently.
processed_values = []
for sub_value in value:
if hasattr(sub_value, 'resolve_expression'):
pre_joins = self.alias_refcount.copy()
processed_values.append(
sub_value.resolve_expression(self, reuse=can_reuse, allow_joins=allow_joins)
)
# The used_joins for a tuple of expressions is the union of
# the used_joins for the individual expressions.
used_joins.update(k for k, v in self.alias_refcount.items() if v > pre_joins.get(k, 0))
return value, used_joins
return value
def solve_lookup_type(self, lookup):
"""
@ -1136,7 +1129,9 @@ class Query:
if not allow_joins and len(parts) > 1:
raise FieldError("Joined field references are not permitted in this query")
value, used_joins = self.resolve_lookup_value(value, can_reuse, allow_joins)
pre_joins = self.alias_refcount.copy()
value = self.resolve_lookup_value(value, can_reuse, allow_joins)
used_joins = {k for k, v in self.alias_refcount.items() if v > pre_joins.get(k, 0)}
clause = self.where_class()
if reffed_expression: