Method _apply_annotations

pydantic/_internal/_generate_schema.py:2210–2256

Apply arguments from `Annotated` or from `FieldInfo` to a schema. This gets called by `GenerateSchema._annotated_schema` but differs from it in that it does not expect `source_type` to be an `Annotated` object, it expects it to be the first argument of that (in other words,

(
        self,
        source_type: Any,
        annotations: list[Any],
        transform_inner_schema: Callable[[CoreSchema], CoreSchema] = lambda x: x,
        check_unsupported_field_info_attributes: bool = True,
    )

        return schema

    def _apply_annotations(
        self,
        source_type: Any,
        annotations: list[Any],
        transform_inner_schema: Callable[[CoreSchema], CoreSchema] = lambda x: x,
        check_unsupported_field_info_attributes: bool = True,
    ) -> CoreSchema:
        """Apply arguments from `Annotated` or from `FieldInfo` to a schema.

        This gets called by `GenerateSchema._annotated_schema` but differs from it in that it does
        not expect `source_type` to be an `Annotated` object, it expects it to be  the first argument of that
        (in other words, `GenerateSchema._annotated_schema` just unpacks `Annotated`, this process it).
        """
        annotations = list(_known_annotated_metadata.expand_grouped_metadata(annotations))

        pydantic_js_annotation_functions: list[GetJsonSchemaFunction] = []

        def inner_handler(obj: Any) -> CoreSchema:
            schema = self._generate_schema_from_get_schema_method(obj, source_type)

            if schema is None:
                schema = self._generate_schema_inner(obj)

            metadata_js_function = _extract_get_pydantic_json_schema(obj)
            if metadata_js_function is not None:
                metadata_schema = resolve_original_schema(schema, self.defs)
                if metadata_schema is not None:
                    self._add_js_function(metadata_schema, metadata_js_function)
            return transform_inner_schema(schema)

        get_inner_schema = CallbackGetCoreSchemaHandler(inner_handler, self)

        for annotation in annotations:
            if annotation is None:
                continue
            get_inner_schema = self._get_wrapped_inner_schema(
                get_inner_schema,
                annotation,
                pydantic_js_annotation_functions,
                check_unsupported_field_info_attributes=check_unsupported_field_info_attributes,
            )

        schema = get_inner_schema(source_type)
        if pydantic_js_annotation_functions:
            core_metadata = schema.setdefault('metadata', {})
            update_core_metadata(core_metadata, pydantic_js_annotation_functions=pydantic_js_annotation_functions)
        return _add_custom_serialization_from_json_encoders(self._config_wrapper.json_encoders, source_type, schema)

    def _apply_single_annotation(
        self,