Module: DataMapper::Associations::ManyToOne

Extended by:
DataMapper::Assertions
Defined in:
lib/dm-core/associations/many_to_one.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 one relationship between two models -



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# File 'lib/dm-core/associations/many_to_one.rb', line 9

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}\n      \#{name}_association.nil? ? nil : \#{name}_association\n    end\n\n    def \#{name}=(parent)\n      \#{name}_association.replace(parent)\n    end\n\n    private\n\n    def \#{name}_association\n      @\#{name}_association ||= begin\n        unless relationship = model.relationships(\#{repository_name.inspect})[:\#{name}]\n          raise ArgumentError, \"Relationship \#{name.inspect} does not exist in \\\#{model}\"\n        end\n        association = Proxy.new(relationship, self)\n        child_associations << association\n        association\n      end\n    end\n  EOS\n\n  model.relationships(repository_name)[name] = Relationship.new(\n    name,\n    repository_name,\n    model,\n    options.fetch(:class_name, Extlib::Inflection.classify(name)),\n    options\n  )\nend\n", __FILE__, __LINE__