Module: DataMapper::Associations::ManyToMany

Extended by:
DataMapper::Assertions
Defined in:
lib/dm-core/associations/many_to_many.rb

Defined Under Namespace

Classes: Proxy

Class Method Summary collapse

Methods included from DataMapper::Assertions

assert_kind_of

Class Method Details

.setup(name, model, options = {}) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Setup many to many relationship between two models -



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# File 'lib/dm-core/associations/many_to_many.rb', line 10

def self.setup(name, model, options = {})
  assert_kind_of 'name',    name,    Symbol
  assert_kind_of 'model',   model,   Model
  assert_kind_of 'options', options, Hash

  repository_name = model.repository.name

  model.class_eval "    def \#{name}(query = {})\n      \#{name}_association.all(query)\n    end\n\n    def \#{name}=(children)\n      \#{name}_association.replace(children)\n    end\n\n    private\n\n    def \#{name}_association\n      @\#{name}_association ||= begin\n        unless relationship = model.relationships(\#{repository_name.inspect})[\#{name.inspect}]\n          raise ArgumentError, \"Relationship \#{name.inspect} does not exist in \\\#{model}\"\n        end\n        association = Proxy.new(relationship, self)\n        parent_associations << association\n        association\n      end\n    end\n  EOS\n\n  opts = options.dup\n  opts.delete(:through)\n  opts[:child_model]              ||= opts.delete(:class_name)  || Extlib::Inflection.classify(name)\n  opts[:parent_model]             =   model\n  opts[:repository_name]          =   repository_name\n  opts[:remote_relationship_name] ||= opts.delete(:remote_name) || Extlib::Inflection.tableize(opts[:child_model])\n  opts[:parent_key]               =   opts[:parent_key]\n  opts[:child_key]                =   opts[:child_key]\n  opts[:mutable]                  =   true\n\n  names        = [ opts[:child_model], opts[:parent_model].name ].sort\n  model_name   = names.join.gsub(\"::\", \"\")\n  storage_name = Extlib::Inflection.tableize(Extlib::Inflection.pluralize(names[0]) + names[1])\n\n  opts[:near_relationship_name] = Extlib::Inflection.tableize(model_name).to_sym\n\n  model.has(model.n, opts[:near_relationship_name])\n\n  relationship = model.relationships(repository_name)[name] = RelationshipChain.new(opts)\n\n  unless Object.const_defined?(model_name)\n    model = DataMapper::Model.new(storage_name)\n\n    model.class_eval <<-EOS, __FILE__, __LINE__\n      def self.name; \#{model_name.inspect} end\n      def self.default_repository_name; \#{repository_name.inspect} end\n      def self.many_to_many; true end\n    EOS\n\n    names.each do |n|\n      model.belongs_to(Extlib::Inflection.underscore(n).gsub(\"/\", \"_\").to_sym, :class_name => n)\n    end\n\n    Object.const_set(model_name, model)\n  end\n\n  relationship\nend\n", __FILE__, __LINE__