Module: DataMapper::Associations::OneToOne

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

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 one to one relationship between two models -



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# File 'lib/dm-core/associations/one_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 <<-EOS, __FILE__, __LINE__
    def #{name}
      #{name}_association.first
    end

    def #{name}=(child_resource)
      #{name}_association.replace(child_resource.nil? ? [] : [ child_resource ])
    end

    private

    def #{name}_association
      @#{name}_association ||= begin
        unless relationship = model.relationships(#{repository_name.inspect})[:#{name}]
          raise ArgumentError, "Relationship #{name.inspect} does not exist in \#{model}"
        end
        association = Associations::OneToMany::Proxy.new(relationship, self)
        parent_associations << association
        association
      end
    end
  EOS

  model.relationships(repository_name)[name] = if options.has_key?(:through)
    RelationshipChain.new(
      :child_model              => options.fetch(:class_name, Extlib::Inflection.classify(name)),
      :parent_model             => model,
      :repository_name          => repository_name,
      :near_relationship_name   => options[:through],
      :remote_relationship_name => options.fetch(:remote_name, name),
      :parent_key               => options[:parent_key],
      :child_key                => options[:child_key]
    )
  else
    Relationship.new(
      name,
      repository_name,
      options.fetch(:class_name, Extlib::Inflection.classify(name)),
      model,
      options
    )
  end
end