docs: def inject_to(self, objects, field_name, get_inject_object = lambda obj: obj, **kwargs):
          '''
          ``objects`` is an iterable. Images (or other generic-related model instances)
              will be attached to elements of this iterable.
  
          ``field_name`` is the attached object attribute name
  
          ``get_inject_object`` is a callable that takes object in `objects` iterable.
              Image will be available as an attribute of the result of
              `get_injector_object(object)`. Images attached to `get_injector_object(object)`
              will be selected.
  
          All other kwargs will be passed as arguments to queryset filter function.
  
          Example: you have a list of comments. Each comment has 'user' attribute.
          You want to fetch 10 comments and their authors with avatars. Avatars should
          be accessible as `user.avatar`::
  
              comments = Comment.objects.all().select_related('user')[:10]
              AttachedImage.injector.inject_to(comments, 'avatar', lambda obj: obj.user, is_main=True)
  
          '''
  
          try:
              content_type = ContentType.objects.get_for_model(get_inject_object(objects[0]))
          except IndexError:
              return objects
  
          kwargs.update({self.ct_field: content_type})
          return super(GenericInjector, self).inject_to(objects, field_name, get_inject_object, **kwargs)