          """
          for model in models:
              # Store as 'name: model' pair in a dictionary
              # in the app_models dictionary
              model_name = model._meta.object_name.lower()
              model_dict = self.app_models.setdefault(app_label, SortedDict())
              if model_name in model_dict:
                  # The same model may be imported via different paths (e.g.
                  # appname.models and project.appname.models). We use the source
                  # filename as a means to detect identity.
 
</s> remove         (model._meta.object_name.lower(), model)
 </s> add         (model._meta.model_name, model) </s> remove         return self.rel.related_name or self.opts.object_name.lower()
 </s> add         return self.rel.related_name or self.opts.model_name </s> remove                 model = opts.object_name.lower(),
 </s> add                 model = opts.model_name, </s> remove                 raise AlreadyModerated("The model '%s' is already being moderated" % model._meta.module_name)
 </s> add                 raise AlreadyModerated("The model '%s' is already being moderated" % model._meta.model_name) </s> remove                                     rel_to._meta.module_name),
 </s> add                                     rel_to._meta.model_name),
            model_name = model._meta.model_name
          """
          for model in models:
              # Store as 'name: model' pair in a dictionary
              # in the app_models dictionary
            model_name = model._meta.model_name
              model_dict = self.app_models.setdefault(app_label, SortedDict())
              if model_name in model_dict:
                  # The same model may be imported via different paths (e.g.
                  # appname.models and project.appname.models). We use the source
                  # filename as a means to detect identity.
keep keep keep keep replace keep keep keep keep keep
 Fixed #19689 -- Renamed `Model._meta.module_name` to `model_name`. 
django/db/models/loading.py