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constructor

django_spire.contrib.constructor.constructor

TypeAny = TypeVar('TypeAny', bound=Any, covariant=True) module-attribute

BaseConstructor

Bases: ABC, Generic[TypeAny]

Source code in django_spire/contrib/constructor/constructor.py 
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def __init__(self, obj: Any = None):
    self._obj_type_name: str = str(
        next(iter(self.__class__.__annotations__.values()))
    ).split('.')[-1]

    if obj is None:
        return

    self._obj_mro_type_names = [cls.__name__ for cls in obj.__class__.__mro__]

    if self._obj_type_name not in self._obj_mro_type_names:
        message = f'{self.__class__.__name__} was instantiated with obj type "{obj.__class__.__name__}" and failed as it was expecting "{self._obj_type_name}".'
        raise ConstructorError(message)

    self._obj_type: type[TypeAny] = obj.__class__

    if self._obj_type is None or self._obj_type is ...:
        message = f'{self.__class__.__name__} top class attribute must have an annotated type.'
        raise ConstructorError(message)

    self.obj: TypeAny = obj

    if ABC not in self.__class__.__bases__:
        if not self._obj_is_valid:
            message = f'{self._obj_type_name} failed to validate on {self.__class__.__name__}'
            raise ConstructorError(message)

    self.__post_init__()

obj = obj instance-attribute

obj_class property

__init_subclass__

Source code in django_spire/contrib/constructor/constructor.py 
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def __init_subclass__(cls):
    super().__init_subclass__()

    if ABC not in cls.__bases__:
        if 'obj' not in cls.__annotations__:
            message = f'{cls.__name__} must have an "obj" attribute annotated with a type.'
            raise ConstructorError(message)

        # Typing Does not work properly for services if you override __get__ in the BaseService class.
        # This is a workaround and should be fixed in future versions of the python lsp.
        def __get__(self, instance, owner):

            if instance is None:
                target: cls | Any = owner()
            else:
                target: cls | Any = instance

            if issubclass(target.__class__, BaseConstructor):

                self._validate_base_service_target_or_error(target)

                return cls(target.obj)

            return cls(target)

        cls.__get__ = __get__

__post_init__

Source code in django_spire/contrib/constructor/constructor.py 
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def __post_init__(self):
    pass