ruby on rails - Belongs_to association in ActiveModel::Serializer removes root from JSON -

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I currently write an API with rail. After seeing RailsCast about ActiveModel :: Serializer I wanted to try them out.

A brief overview on my current models: 

  class clubs & lt; ActiveRecord :: Base has_many: User and Class User & lt; ActiveRecord :: Base is valid: Username, Attendance: TrueSat_to: Club End   
 The following JSON returns from the user:  
  {"id": 1, "username": "test", "first name": "test", "last name": "test", "created_at": "2014-10- 10T12: 42: 12.186Z", "updated_at": "Test", "Mail": "Test", "Club_ID": 1}  < / Pre> 
 As an example, I have implemented UserSerializer as the following from the ActiveModel :: Serializer page:  
  class UserSerializer & lt; ActiveModel :: Serializer Features: ID ,: Username ,: First Name, Last Name :: Mail ,: Street,: City,: club_id end   
 This "user" adds: the root As my JSON format. In addition, for example  
  add_to: club   
 shows the serializer. But if I add related, then I do not get "user": as the root of my json Is it intentional behavior? Is there a way to change this? After additional testing it seems that "user": Root element randomly - you have not yet got a pattern - added or dropped.  
 I tried to add the root:   for my users_controller I came to know that to solve the problem , But I still want to make an explanation if someone knows what's wrong with the concerned.  
 The_On serves related functions and adds "user": as JSON root.

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