Class: ActiveRecord::Associations::Builder::HasAndBelongsToMany

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record/associations/builder/has_and_belongs_to_many.rb

Overview

:nodoc:

Defined Under Namespace

Classes: JoinTableResolver

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(association_name, lhs_model, options) ⇒ HasAndBelongsToMany

Returns a new instance of HasAndBelongsToMany.



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# File 'lib/active_record/associations/builder/has_and_belongs_to_many.rb', line 38

def initialize(association_name, lhs_model, options)
  @association_name = association_name
  @lhs_model = lhs_model
  @options = options
end

Instance Attribute Details

#association_name ⇒ Object (readonly)

Returns the value of attribute association_name.



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# File 'lib/active_record/associations/builder/has_and_belongs_to_many.rb', line 36

def association_name
  @association_name
end

#lhs_model ⇒ Object (readonly)

Returns the value of attribute lhs_model.



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# File 'lib/active_record/associations/builder/has_and_belongs_to_many.rb', line 36

def lhs_model
  @lhs_model
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/active_record/associations/builder/has_and_belongs_to_many.rb', line 36

def options
  @options
end

Instance Method Details

#middle_reflection(join_model) ⇒ Object 



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# File 'lib/active_record/associations/builder/has_and_belongs_to_many.rb', line 86

def middle_reflection(join_model)
  middle_name = [lhs_model.name.downcase.pluralize,
                 association_name].join('_').gsub(/::/, '_').to_sym
  middle_options = middle_options join_model
  hm_builder = HasMany.create_builder(lhs_model,
                                      middle_name,
                                      nil,
                                      middle_options)
  hm_builder.build lhs_model
end

#through_model ⇒ Object 



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# File 'lib/active_record/associations/builder/has_and_belongs_to_many.rb', line 44

def through_model
  habtm = JoinTableResolver.build lhs_model, association_name, options

  join_model = Class.new(ActiveRecord::Base) {
    class << self;
      attr_accessor :class_resolver
      attr_accessor :name
      attr_accessor :table_name_resolver
      attr_accessor :left_reflection
      attr_accessor :right_reflection
    end

    def self.table_name
      table_name_resolver.join_table
    end

    def self.compute_type(class_name)
      class_resolver.compute_type class_name
    end

    def self.add_left_association(name, options)
      belongs_to name, 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, options
      self.right_reflection = _reflect_on_association(rhs_name)
    end

  }

  join_model.name                = "HABTM_#{association_name.to_s.camelize}"
  join_model.table_name_resolver = habtm
  join_model.class_resolver      = lhs_model

  join_model.add_left_association :left_side, class: lhs_model
  join_model.add_right_association association_name, belongs_to_options(options)
  join_model
end