          if self.field.rel.multiple:
              # If this is a symmetrical m2m relation on self, there is no reverse accessor.
              if getattr(self.field.rel, 'symmetrical', False) and self.model == self.parent_model:
                  return None
              return self.field.rel.related_name or (self.opts.object_name.lower() + '_set')
          else:
              return self.field.rel.related_name or (self.opts.object_name.lower())
  
      def get_cache_name(self):
          return "_%s_cache" % self.get_accessor_name()
 
</s> remove             return self.field.rel.related_name or (self.opts.object_name.lower())
 </s> add             return self.field.rel.related_name or (self.opts.model_name) </s> remove                 self.model._meta.object_name.lower(),
 </s> add                 self.model._meta.model_name, </s> remove                 self.object._meta.object_name.lower(),
 </s> add                 self.object._meta.model_name, </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             return '%s_list' % object_list.model._meta.object_name.lower()
 </s> add             return '%s_list' % object_list.model._meta.model_name
            return self.field.rel.related_name or (self.opts.model_name + '_set')
          if self.field.rel.multiple:
              # If this is a symmetrical m2m relation on self, there is no reverse accessor.
              if getattr(self.field.rel, 'symmetrical', False) and self.model == self.parent_model:
                  return None
            return self.field.rel.related_name or (self.opts.model_name + '_set')
          else:
              return self.field.rel.related_name or (self.opts.object_name.lower())
  
      def get_cache_name(self):
          return "_%s_cache" % self.get_accessor_name()
keep keep keep keep replace keep keep keep keep keep
 Fixed #19689 -- Renamed `Model._meta.module_name` to `model_name`. 
django/db/models/related.py