require "spec_helper" describe Positionable do def positions TestItem.order('position asc, id asc').pluck(:id) end context "move_to" do before do class TestItem < ActiveRecord::Base include Positionable end Topic.exec_sql("create temporary table test_items(id int primary key, position int)") end after do Topic.exec_sql("drop table test_items") # import is making my life hard, we need to nuke this out of orbit des = ActiveSupport::DescendantsTracker.class_variable_get :@@direct_descendants des[ActiveRecord::Base].delete(TestItem) end it "can position stuff correctly" do 5.times do |i| Topic.exec_sql("insert into test_items(id,position) values(#{i}, #{i})") end expect(positions).to eq([0,1,2,3,4]) TestItem.find(3).move_to(0) expect(positions).to eq([3,0,1,2,4]) expect(TestItem.pluck(:position).sort).to eq([0,1,2,3,4]) TestItem.find(3).move_to(1) expect(positions).to eq([0,3,1,2,4]) # this is somewhat odd, but when there is no such position, not much we can do TestItem.find(1).move_to(5) expect(positions).to eq([0,3,2,4,1]) expect(TestItem.pluck(:position).sort).to eq([0,1,2,3,4]) item = TestItem.new item.id = 7 item.save expect(item.position).to eq(5) end end end