mirror of
https://github.com/davidhalter/django-stubs.git
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b3ed9e4827
* Add testcase for queryset inheritance * Add PoC * Add condition for stop to looping over mro * Change harcoded queryset class name to constant from fullnames
78 lines
3.4 KiB
Python
78 lines
3.4 KiB
Python
from mypy.nodes import (
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GDEF, FuncDef, MemberExpr, NameExpr, RefExpr, StrExpr, SymbolTableNode, TypeInfo,
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)
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from mypy.plugin import ClassDefContext, DynamicClassDefContext
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from mypy.types import AnyType, Instance, TypeOfAny
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from mypy_django_plugin.lib import fullnames, helpers
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def create_new_manager_class_from_from_queryset_method(ctx: DynamicClassDefContext) -> None:
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semanal_api = helpers.get_semanal_api(ctx)
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callee = ctx.call.callee
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assert isinstance(callee, MemberExpr)
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assert isinstance(callee.expr, RefExpr)
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base_manager_info = callee.expr.node
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if base_manager_info is None:
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if not semanal_api.final_iteration:
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semanal_api.defer()
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return
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assert isinstance(base_manager_info, TypeInfo)
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new_manager_info = semanal_api.basic_new_typeinfo(ctx.name,
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basetype_or_fallback=Instance(base_manager_info,
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[AnyType(TypeOfAny.unannotated)]))
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new_manager_info.line = ctx.call.line
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new_manager_info.defn.line = ctx.call.line
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new_manager_info.metaclass_type = new_manager_info.calculate_metaclass_type()
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current_module = semanal_api.cur_mod_node
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current_module.names[ctx.name] = SymbolTableNode(GDEF, new_manager_info,
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plugin_generated=True)
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passed_queryset = ctx.call.args[0]
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assert isinstance(passed_queryset, NameExpr)
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derived_queryset_fullname = passed_queryset.fullname
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assert derived_queryset_fullname is not None
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sym = semanal_api.lookup_fully_qualified_or_none(derived_queryset_fullname)
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assert sym is not None
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if sym.node is None:
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if not semanal_api.final_iteration:
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semanal_api.defer()
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else:
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# inherit from Any to prevent false-positives, if queryset class cannot be resolved
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new_manager_info.fallback_to_any = True
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return
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derived_queryset_info = sym.node
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assert isinstance(derived_queryset_info, TypeInfo)
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if len(ctx.call.args) > 1:
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expr = ctx.call.args[1]
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assert isinstance(expr, StrExpr)
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custom_manager_generated_name = expr.value
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else:
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custom_manager_generated_name = base_manager_info.name + 'From' + derived_queryset_info.name
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custom_manager_generated_fullname = '.'.join(['django.db.models.manager', custom_manager_generated_name])
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if 'from_queryset_managers' not in base_manager_info.metadata:
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base_manager_info.metadata['from_queryset_managers'] = {}
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base_manager_info.metadata['from_queryset_managers'][custom_manager_generated_fullname] = new_manager_info.fullname
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class_def_context = ClassDefContext(cls=new_manager_info.defn,
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reason=ctx.call, api=semanal_api)
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self_type = Instance(new_manager_info, [])
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# we need to copy all methods in MRO before django.db.models.query.QuerySet
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for class_mro_info in derived_queryset_info.mro:
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if class_mro_info.fullname == fullnames.QUERYSET_CLASS_FULLNAME:
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break
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for name, sym in class_mro_info.names.items():
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if isinstance(sym.node, FuncDef):
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helpers.copy_method_to_another_class(class_def_context,
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self_type,
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new_method_name=name,
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method_node=sym.node)
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