method
through_model
v7.1.3.2 -
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Class: HasAndBelongsToMany
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through_model()
public
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# File activerecord/lib/active_record/associations/builder/has_and_belongs_to_many.rb, line 13 def through_model join_model = Class.new(ActiveRecord::Base) { class << self attr_accessor :left_model attr_accessor :name attr_accessor :table_name_resolver attr_accessor :left_reflection attr_accessor :right_reflection end @table_name = nil def self.table_name # Table name needs to be resolved lazily # because RHS class might not have been loaded @table_name ||= table_name_resolver.call end def self.compute_type(class_name) left_model.compute_type class_name end def self.add_left_association(name, options) belongs_to name, required: false, **options self.left_reflection = _reflect_on_association(name) end def self.add_right_association(name, options) rhs_name = name.to_s.singularize.to_sym belongs_to rhs_name, required: false, **options self.right_reflection = _reflect_on_association(rhs_name) end def self.retrieve_connection left_model.retrieve_connection end } join_model.name = "HABTM_#{association_name.to_s.camelize}" join_model.table_name_resolver = -> { table_name } join_model.left_model = lhs_model join_model.add_left_association :left_side, anonymous_class: lhs_model join_model.add_right_association association_name, belongs_to_options(options) join_model end