"self referencing association in ruby on rails" Code Answer's
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rails self relation
class MyModel < ActiveRecord::Base
belongs_to :parent, :class_name => 'MyModel'
has_many :children, :class_name => 'MyModel', :foreign_key => 'parent_id'
end
self referencing association in ruby on rails
has_many :users, class_name: 'User'
belongs_to :manager, class_name: 'User', optional: true
Source: stackoverflow.com
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