1. class DefaultOtherRouter:
    
  2.     def allow_migrate(self, db, app_label, model_name=None, **hints):
    
  3.         return db in {"default", "other"}
    
  4. 
    
  5. 
    
  6. class TestRouter:
    
  7.     def allow_migrate(self, db, app_label, model_name=None, **hints):
    
  8.         """
    
  9.         The Tribble model should be the only one to appear in the 'other' db.
    
  10.         """
    
  11.         if model_name == "tribble":
    
  12.             return db == "other"
    
  13.         elif db != "default":
    
  14.             return False