mirror of
https://github.com/davidhalter/django-stubs.git
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52 lines
2.2 KiB
Python
52 lines
2.2 KiB
Python
from mypy.plugin import MethodContext
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from mypy.types import AnyType, Instance
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from mypy.types import Type as MypyType
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from mypy.types import TypeOfAny
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from mypy_django_plugin.django.context import DjangoContext
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from mypy_django_plugin.lib import fullnames, helpers
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def typecheck_queryset_filter(ctx: MethodContext, django_context: DjangoContext) -> MypyType:
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lookup_kwargs = ctx.arg_names[1]
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provided_lookup_types = ctx.arg_types[1]
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assert isinstance(ctx.type, Instance)
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if not ctx.type.args or not isinstance(ctx.type.args[0], Instance):
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return ctx.default_return_type
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model_cls_fullname = ctx.type.args[0].type.fullname
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model_cls = django_context.get_model_class_by_fullname(model_cls_fullname)
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if model_cls is None:
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return ctx.default_return_type
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for lookup_kwarg, provided_type in zip(lookup_kwargs, provided_lookup_types):
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if lookup_kwarg is None:
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continue
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if (isinstance(provided_type, Instance)
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and provided_type.type.has_base('django.db.models.expressions.Combinable')):
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provided_type = resolve_combinable_type(provided_type, django_context)
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lookup_type = django_context.resolve_lookup_expected_type(ctx, model_cls, lookup_kwarg)
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# Managers as provided_type is not supported yet
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if (isinstance(provided_type, Instance)
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and helpers.has_any_of_bases(provided_type.type, (fullnames.MANAGER_CLASS_FULLNAME,
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fullnames.QUERYSET_CLASS_FULLNAME))):
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return ctx.default_return_type
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helpers.check_types_compatible(ctx,
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expected_type=lookup_type,
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actual_type=provided_type,
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error_message=f'Incompatible type for lookup {lookup_kwarg!r}:')
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return ctx.default_return_type
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def resolve_combinable_type(combinable_type: Instance, django_context: DjangoContext) -> MypyType:
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if combinable_type.type.fullname != fullnames.F_EXPRESSION_FULLNAME:
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# Combinables aside from F expressions are unsupported
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return AnyType(TypeOfAny.explicit)
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return django_context.resolve_f_expression_type(combinable_type)
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