single_record_friendship_model.rb

require "dm_spec"
require 'dm-core'

require 'dm-migrations'
require 'dm-types'
require 'dm-validations'

require 'dm-timestamps'

describe DmSpec do

	before(:all) do
		DataMapper.setup(:default, 'sqlite::memory:')

		class User
			include DataMapper::Resource

			property :id, Serial

			has n, :friendship_requests,'FriendshipRequest', :child_key => [ :sender_id ]
			has n, :friendship_offers,	'FriendshipRequest', :child_key => [ :receiver_id ]
			has n, :friendships_requested, 'Friendship', :child_key => [:user_id]
			has n, :friendships_offered, 'Friendship', :child_key => [:friend_id]
		end

		class FriendshipRequest
			include DataMapper::Resource

			belongs_to :sender,		'User', :key => true
			belongs_to :receiver,	'User', :key => true

			has 1, :friendship, :child_key => [:user_id,:friend_id]

		end
		
		class Friendship
			include DataMapper::Resource

			belongs_to :user,	'User', :key => true
			belongs_to :friend,	'User', :key => true

			belongs_to :request, 'FriendshipRequest' #, :child_key => [:sender_id,:receiver_id]

		end
		
		DataMapper.auto_migrate!
	end

	describe 'Friendship' do
		it do
			user = User.create
			friend = User.create
			req = FriendshipRequest.create(:sender => user, :receiver => friend)
			fs = Friendship.create(:user => user, :friend => friend, :request => req)

			fs.request.should == req
			fs.reload
			# Since the request-property is not present in the DB, it is set to nil
			fs.request.should_not be_nil
		end
	end
end