Question

Given the code from the Complex Form part III how would you go about testing the virtual attribute?

  def new_task_attributes=(task_attributes)     task_attributes.each do |attributes|       tasks.build(attributes)     end   end 

I am currently trying to test it like this:

  def test_adding_task_to_project     p = Project.new     params = {"new_tasks_attributes" => [{ "name" => "paint fence"}]}     p.new_tasks_attributes=(params)     p.save     assert p.tasks.length == 1   end 

But I am getting the following error:

NoMethodError: undefined method `stringify_keys!’ for "new_tasks_attributes":String

Any suggestions on improving this test would be greatly appreciated.

Answer 1

It looks as if new_task_attributes= is expecting an array of hashes, but you’re passing it a hash. Try this:

def test_adding_task_to_project   p = Project.new   new_tasks_attributes = [{ 'name' => 'paint fence'}]   p.new_tasks_attributes = (new_tasks_attributes)   p.save   assert p.tasks.length == 1 end