old_contents: # -*- coding: utf-8 -*-
  from opps.core.tests.models.channel import *
  from opps.core.tests.models.source import *
  
new_contents: # -*- coding: utf-8 -*-
  from opps.core.tests.models.source import *
  
subject: fix models did not validate, Accessor for field CommandError: One or more models did not validate: core.channel: Accessor for field 'user' clashes with related field 'User.channel_set'. Add a related_name argument to the definition for 'user'. core.channel: Accessor for field 'site' clashes with related field 'Site.channel_set'. Add a related_name argument to the definition for 'site'. channel.channel: Accessor for field 'user' clashes with related field 'User.channel_set'. Add a related_name argument to the definition for 'user'. channel.channel: Accessor for field 'site' clashes with related field 'Site.channel_set'. Add a related_name argument to the definition for 'site'.