Rails has_many self referential

问题

I have an accounts model as follows (simplified):

class Account < ActiveRecord::Base
    attr_accessible :account_number, :display_name, :master_account_id

    has_many :child_accounts, :class_name => "Account", :foreign_key => "id"
    belongs_to :master_account, :class_name => "Account", :foreign_key => "master_account_id"
end

@account.master_account is currently working correctly, but I also want to be able to access @account.child_accounts - what do I need to do in order to fix that?

回答1:

I think it has to be the other way round:

class Account < ActiveRecord::Base
  has_many :child_accounts, :class_name => "Account", :foreign_key => "master_account_id"
  belongs_to :master_account, :class_name => "Account"
end

来源：https://stackoverflow.com/questions/11100091/rails-has-many-self-referential