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Created by: nesrual

I have a Rails project with the following models:

account
username
user
address

With the following associations:

class Account < ActiveRecord::Base
  has_many :users, :inverse_of => :account
  has_many :addresses, :inverse_of => :account
  has_many :usernames, :inverse_of => :account

  accepts_nested_attributes_for :usernames
  accepts_nested_attributes_for :users
  accepts_nested_attributes_for :addresses
end

class Username < ActiveRecord::Base
  belongs_to :account
end

class User < ActiveRecord::Base
  belongs_to :account
  belongs_to :username
end

class Address < ActiveRecord::Base
  belongs_to :account
end

I build a new account:

account = Account.new(params.require(:account).permit(
    usernames_attributes: [:username], 
    users_attributes: [:password, :firstname, :lastname, :phone, :mobile, :fax],
    addresses_attributes: [:address_line_1, :address_line_2, :city, :zipcode, :state, :country]))

which validates and saves fine under Rails 4.2.0, however with Rails 4.2.1 I get the following error returned from PostgreSQL:

 ActiveRecord::StatementInvalid:
   PG::NotNullViolation: ERROR:  null value in column "account_id" violates not-null constraint

The error is on the username model when trying to save it. Seems like the reference to the account is missing when saving.