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MOdel Why when i put: Member.find(params[:id]).genealogy, it tells: undefined method `genealogy'' for #<Matrix:0x4682280> class Member < ActiveRecord::Base set_primary_key :userid has_many :matrix, :foreign_key => :userid has_many :matrix, :foreign_key => :parent def genealogy result = matrix.clone matrix.each do |m| m.children.each do |c|