def typecheck_queryset_filter(ctx: MethodContext,
django_context: DjangoContext) -> MypyType:
# Expected formal arguments for filter methods are `*args` and `**kwargs`. We'll only typecheck
# `**kwargs`, which means that `arg_names[1]` is what we're interested in.
lookup_kwargs = ctx.arg_names[1]
provided_lookup_types = ctx.arg_types[1]
assert isinstance(ctx.type, Instance)
if not ctx.type.args or not isinstance(ctx.type.args[0], Instance):
return ctx.default_return_type
model_cls_fullname = ctx.type.args[0].type.fullname
model_cls = django_context.get_model_class_by_fullname(model_cls_fullname)
if model_cls is None:
return ctx.default_return_type
for lookup_kwarg, provided_type in zip(lookup_kwargs,
provided_lookup_types):
if lookup_kwarg is None:
continue
if isinstance(provided_type, Instance) and provided_type.type.has_base(
fullnames.COMBINABLE_EXPRESSION_FULLNAME):
provided_type = resolve_combinable_type(provided_type,
django_context)
lookup_type: MypyType
if is_annotated_model_fullname(model_cls_fullname):
lookup_type = AnyType(TypeOfAny.implementation_artifact)
else:
lookup_type = django_context.resolve_lookup_expected_type(
ctx, model_cls, lookup_kwarg)
# Managers as provided_type is not supported yet
if isinstance(provided_type, Instance) and helpers.has_any_of_bases(
provided_type.type, (fullnames.MANAGER_CLASS_FULLNAME,
fullnames.QUERYSET_CLASS_FULLNAME)):
return ctx.default_return_type
helpers.check_types_compatible(
ctx,
expected_type=lookup_type,
actual_type=provided_type,
error_message=f"Incompatible type for lookup {lookup_kwarg!r}:",
)
return ctx.default_return_type
def transform_into_proper_return_type(ctx: FunctionContext, django_context: DjangoContext) -> MypyType:
default_return_type = ctx.default_return_type
assert isinstance(default_return_type, Instance)
outer_model_info = helpers.get_typechecker_api(ctx).scope.active_class()
if (outer_model_info is None
or not helpers.is_model_subclass_info(outer_model_info, django_context)):
return ctx.default_return_type
assert isinstance(outer_model_info, TypeInfo)
if helpers.has_any_of_bases(default_return_type.type, fullnames.RELATED_FIELDS_CLASSES):
return fill_descriptor_types_for_related_field(ctx, django_context)
if default_return_type.type.has_base(fullnames.ARRAY_FIELD_FULLNAME):
return determine_type_of_array_field(ctx, django_context)
return set_descriptor_types_for_field(ctx)
def typecheck_queryset_filter(ctx: MethodContext,
django_context: DjangoContext) -> MypyType:
lookup_kwargs = ctx.arg_names[1]
provided_lookup_types = ctx.arg_types[1]
assert isinstance(ctx.type, Instance)
if not ctx.type.args or not isinstance(ctx.type.args[0], Instance):
return ctx.default_return_type
model_cls_fullname = ctx.type.args[0].type.fullname
model_cls = django_context.get_model_class_by_fullname(model_cls_fullname)
if model_cls is None:
return ctx.default_return_type
for lookup_kwarg, provided_type in zip(lookup_kwargs,
provided_lookup_types):
if lookup_kwarg is None:
continue
if isinstance(provided_type, Instance) and provided_type.type.has_base(
"django.db.models.expressions.Combinable"):
provided_type = resolve_combinable_type(provided_type,
django_context)
lookup_type: MypyType
if is_annotated_model_fullname(model_cls_fullname):
lookup_type = AnyType(TypeOfAny.implementation_artifact)
else:
lookup_type = django_context.resolve_lookup_expected_type(
ctx, model_cls, lookup_kwarg)
# Managers as provided_type is not supported yet
if isinstance(provided_type, Instance) and helpers.has_any_of_bases(
provided_type.type, (fullnames.MANAGER_CLASS_FULLNAME,
fullnames.QUERYSET_CLASS_FULLNAME)):
return ctx.default_return_type
helpers.check_types_compatible(
ctx,
expected_type=lookup_type,
actual_type=provided_type,
error_message=f"Incompatible type for lookup {lookup_kwarg!r}:",
)
return ctx.default_return_type