mirror of
https://github.com/davidhalter/django-stubs.git
synced 2025-12-07 12:44:29 +08:00
41 lines
1.5 KiB
Python
41 lines
1.5 KiB
Python
from typing import Optional, Callable
|
|
|
|
from mypy.nodes import Var, MDEF, SymbolTableNode
|
|
from mypy.plugin import Plugin, FunctionContext
|
|
from mypy.types import Type, CallableType, Instance
|
|
|
|
|
|
def set_related_name_manager_for_foreign_key(ctx: FunctionContext) -> Type:
|
|
if 'related_name' not in ctx.context.arg_names:
|
|
return ctx.default_return_type
|
|
|
|
assert 'to' in ctx.context.arg_names
|
|
to_arg_value = ctx.arg_types[ctx.context.arg_names.index('to')][0]
|
|
if not isinstance(to_arg_value, CallableType):
|
|
return ctx.default_return_type
|
|
|
|
referred_to = to_arg_value.ret_type
|
|
related_name = ctx.context.args[ctx.context.arg_names.index('related_name')].value
|
|
outer_class_info = ctx.api.tscope.classes[-1]
|
|
|
|
queryset_type = ctx.api.named_generic_type('django.db.models.QuerySet',
|
|
args=[Instance(outer_class_info, [])])
|
|
related_var = Var(related_name,
|
|
queryset_type)
|
|
related_var.info = queryset_type.type
|
|
referred_to.type.names[related_name] = SymbolTableNode(MDEF, related_var,
|
|
plugin_generated=True)
|
|
return ctx.default_return_type
|
|
|
|
|
|
class RelatedFieldsPlugin(Plugin):
|
|
def get_function_hook(self, fullname: str
|
|
) -> Optional[Callable[[FunctionContext], Type]]:
|
|
if fullname == 'django.db.models.fields.related.ForeignKey':
|
|
return set_related_name_manager_for_foreign_key
|
|
return None
|
|
|
|
|
|
def plugin(version):
|
|
return RelatedFieldsPlugin
|