mirror of https://github.com/django/django.git
Added Query.join_parent_model()
This simplifies especially compiler.py a lot, where almost the same code was repeated multiple times. Refs #19385
This commit is contained in:
Anssi Kääriäinen
parent
4511aeb6b8
commit
68985db482
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@ -261,27 +261,14 @@ class SQLCompiler(object):
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qn2 = self.connection.ops.quote_name
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aliases = set()
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only_load = self.deferred_to_columns()
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seen = self.query.included_inherited_models.copy()
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if start_alias:
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seen = {None: start_alias}
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seen[None] = start_alias
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for field, model in opts.get_fields_with_model():
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if from_parent and model is not None and issubclass(from_parent, model):
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# Avoid loading data for already loaded parents.
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continue
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if start_alias:
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try:
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alias = seen[model]
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except KeyError:
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link_field = opts.get_ancestor_link(model)
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alias = self.query.join((start_alias, model._meta.db_table,
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link_field.column, model._meta.pk.column),
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join_field=link_field)
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seen[model] = alias
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else:
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# If we're starting from the base model of the queryset, the
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# aliases will have already been set up in pre_sql_setup(), so
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# we can save time here.
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alias = self.query.included_inherited_models[model]
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alias = self.query.join_parent_model(opts, model, start_alias, seen)
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table = self.query.alias_map[alias].table_name
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if table in only_load and field.column not in only_load[table]:
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continue
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@ -623,26 +610,7 @@ class SQLCompiler(object):
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continue
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table = f.rel.to._meta.db_table
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promote = nullable or f.null
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if model:
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int_opts = opts
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alias = root_alias
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alias_chain = []
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for int_model in opts.get_base_chain(model):
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# Proxy model have elements in base chain
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# with no parents, assign the new options
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# object and skip to the next base in that
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# case
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if not int_opts.parents[int_model]:
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int_opts = int_model._meta
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continue
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lhs_col = int_opts.parents[int_model].column
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link_field = int_opts.get_ancestor_link(int_model)
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int_opts = int_model._meta
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alias = self.query.join((alias, int_opts.db_table, lhs_col,
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int_opts.pk.column), promote=promote, join_field=link_field)
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alias_chain.append(alias)
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else:
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alias = root_alias
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alias = self.query.join_parent_model(opts, model, root_alias, {})
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alias = self.query.join((alias, table, f.column,
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f.rel.get_related_field().column),
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@ -670,28 +638,8 @@ class SQLCompiler(object):
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only_load.get(model), reverse=True):
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continue
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alias = self.query.join_parent_model(opts, f.rel.to, root_alias, {})
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table = model._meta.db_table
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int_opts = opts
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alias = root_alias
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alias_chain = []
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chain = opts.get_base_chain(f.rel.to)
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if chain is not None:
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for int_model in chain:
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# Proxy model have elements in base chain
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# with no parents, assign the new options
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# object and skip to the next base in that
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# case
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if not int_opts.parents[int_model]:
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int_opts = int_model._meta
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continue
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lhs_col = int_opts.parents[int_model].column
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link_field = int_opts.get_ancestor_link(int_model)
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int_opts = int_model._meta
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alias = self.query.join(
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(alias, int_opts.db_table, lhs_col, int_opts.pk.column),
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promote=True, join_field=link_field
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)
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alias_chain.append(alias)
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alias = self.query.join(
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(alias, table, f.rel.get_related_field().column, f.column),
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promote=True, join_field=f
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@ -1004,12 +1004,40 @@ class Query(object):
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for field, model in opts.get_fields_with_model():
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if model not in seen:
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link_field = opts.get_ancestor_link(model)
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seen[model] = self.join(
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(root_alias, model._meta.db_table, link_field.column,
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model._meta.pk.column), join_field=link_field)
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self.join_parent_model(opts, model, root_alias, seen)
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self.included_inherited_models = seen
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def join_parent_model(self, opts, model, alias, seen):
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"""
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Makes sure the given 'model' is joined in the query. If 'model' isn't
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a parent of 'opts' or if it is None this method is a no-op.
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The 'alias' is the root alias for starting the join, 'seen' is a dict
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of model -> alias of existing joins.
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"""
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if model in seen:
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return seen[model]
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int_opts = opts
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chain = opts.get_base_chain(model)
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if chain is None:
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return alias
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for int_model in chain:
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if int_model in seen:
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return seen[int_model]
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# Proxy model have elements in base chain
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# with no parents, assign the new options
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# object and skip to the next base in that
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# case
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if not int_opts.parents[int_model]:
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int_opts = int_model._meta
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continue
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link_field = int_opts.get_ancestor_link(int_model)
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int_opts = int_model._meta
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connection = (alias, int_opts.db_table, link_field.column, int_opts.pk.column)
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alias = seen[int_model] = self.join(connection, nullable=False,
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join_field=link_field)
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return alias
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def remove_inherited_models(self):
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"""
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Undoes the effects of setup_inherited_models(). Should be called
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