class DjangoFilterBackend(DjangoFilterBackend):
 def get_schema_operation_parameters(self, view):
 """
 Convert backend filter `name` to JSON:API-style `filter[name]`.
 For filters that are relationship paths, rewrite ORM-style `__` to our preferred `.`.
 For example: `blog__name__contains` becomes `filter[blog.name.contains]`.

 This is basically the reverse of `get_filterset_kwargs` above.
 """
 result = super().get_schema_operation_parameters(view)
 for res in result:
 if "name" in res:
 name = format_field_name(res["name"].replace("__", "."))
 res["name"] = "filter[{}]".format(name)
 return result

class AutoSchema(drf_openapi.AutoSchema):
 """
 Extend DRF's openapi.AutoSchema for JSON:API serialization.
 """
 ...
 def map_serializer(self, serializer):
 ...
 if field.required:
 required.append(format_field_name(field.field_name))