add

physical/DBRouter.py

 # !/usr/bin/env python
 # -*- coding: utf-8 -*-
+DATABASE_APPS_MAPPING = {'face': 'face', 'commodity': 'commodity'}
 
 
 class DBRouter:
@@ -15,8 +16,8 @@ class DBRouter:
         # if model._meta.app_label == 'face':
         #     return 'face'
 
-        if model._meta.app_label == 'commodity':
-            return 'commodity'
+        if model._meta.app_label in DATABASE_APPS_MAPPING:
+            return DATABASE_APPS_MAPPING[model._meta.app_label]
         return None
 
     def db_for_write(self, model, **hints):
@@ -26,29 +27,32 @@ class DBRouter:
         # if model._meta.app_label == 'face':
         #     return 'face'
 
-        if model._meta.app_label == 'commodity':
-            return 'commodity'
+        if model._meta.app_label in DATABASE_APPS_MAPPING:
+            return DATABASE_APPS_MAPPING[model._meta.app_label]
         return None
 
     def allow_relation(self, obj1, obj2, **hints):
         """
         Allow relations if a model in the user app is involved.
         # """
-        # if obj1._meta.app_label == 'face' or \
-        #         obj2._meta.app_label == 'face':
-        #     return True
-        if obj1._meta.app_label == 'commodity' or \
-                obj2._meta.app_label == 'commodity':
-            return True
-        return None
+        db_obj1 = DATABASE_APPS_MAPPING.get(obj1._meta.app_label)
+        db_obj2 = DATABASE_APPS_MAPPING.get(obj2._meta.app_label)
+        if db_obj1 and db_obj2:
+            if db_obj1 == db_obj2:
+                return True
+            else:
+                return False
+        else:
+            return None
 
     def allow_migrate(self, db, app_label, model_name=None, **hints):
         """
         Make sure the auth app only appears in the 'users_db'
         database.
         """
-        # if app_label == 'face':
-        #     return db == 'face'
-        if app_label == 'commodity':
-            return db == 'commodity'
+        if db in DATABASE_APPS_MAPPING.values():
+            return DATABASE_APPS_MAPPING.get(app_label) == db
+        elif app_label in DATABASE_APPS_MAPPING:
+            return False
+
         return None