Rspec argumenterror when passing invalid parameters

Question

I'm creating an Rspec controller test for a create action that takes parameters for two objects, story and ku. Story validates presence of title and large_cover_url. Not sure why rspec throws an argument error when passing invalid parameters, and could use some insight on this issue.

Here is the error:

Failure/Error: post :create, story: {title: nil, large_cover_url: "present"}, ku: Fabricate.attributes_for(:ku)
     ArgumentError:
       wrong number of arguments (0 for 2)
     # ./app/controllers/stories_controller.rb:18:in `create'
     # ./spec/controllers/stories_controller_spec.rb:59:in `block (4 levels) in <top (required)>'

Here is the spec:

context "failed story creation" do
    let(:bob) { Fabricate(:user) }
    before { sign_in_user(bob) }

    it "does not create a new story" do
        post :create, story: {title: nil, large_cover_url: "present"}, ku: Fabricate.attributes_for(:ku)
        expect(Story.count).to eq(0)
    end
end

Here is the controller action:

def create
    @story = Story.new(params[:story])
    @ku = Ku.new(params[:ku])
  if @story.save && @ku.save
    @story.update_column(:user_id, current_user.id)
    @ku.update_column(:user_id, current_user.id)
    @story.kus << @ku
    redirect_to story_path(@story), flash: {success: "Your story was published."}
  else
    flash[:error] = "#{@story.errors.full_message.join(', ')}"
    render :new
  end
end

akhanubis · Accepted Answer · 2013-09-09 01:45:44Z

1

The method full_message accepts as parameters the name of an attribute an the error string, so when you do flash[:error] = "#{@story.errors.full_message.join(', ')}", you are calling full_message without any parameters. You should use full_messages instead that returns an array with all the error messages.

ActiveModel::Errors api ref

answered Sep 9, 2013 at 1:45

akhanubis

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1 Comment

Stephen A Over a year ago

Thank you Pablo, that was spot on!

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