old_contents: import { Serializer } from '../../models'
  
  
  export function addSerializer() {
    return new Serializer("subscribers", {
      select: ['id', 'username', 'screenName', 'type', 'updatedAt', 'createdAt',
               'isPrivate', 'isRestricted', 'profilePictureLargeUrl', 'profilePictureMediumUrl']
    })
  }
  
new_contents: import { Serializer, AdminSerializer } from '../../models'
  
  
  export function addSerializer() {
    return new Serializer("subscribers", {
      select: ['id', 'username', 'screenName', 'type', 'updatedAt', 'createdAt',
               'isPrivate', 'isRestricted', 'profilePictureLargeUrl', 'profilePictureMediumUrl',
               'administrators'],
      administrators: { through: AdminSerializer, embed: true }
    })
  }
  
subject: Add admins of subscribed groups to /users/whoami