How to fix this RSpec error with Mongoid? "can't convert Symbol into Integer"

I'm writing tests for my controller. They are very simple, but this error has kept popping up. This is my controller

  def show
    id=params[:id]
    @user=User.find(:first,id)
  end

My test

  before(:each) do
    @user = Fabricate(:user)
    sign_in @user
  end
  ...
  it "should be successful" do
    开发者_运维百科get "show", :id => @user
    response.should be_success
  end

And the error message

  1) UsersController GET 'show' for the logged in user should be successful
     Failure/Error: get "show", :id => @user
     TypeError:
       can't convert Symbol into Integer
     # ./app/controllers/users_controller.rb:6:in `show'
     # ./spec/controllers/users_controller_spec.rb:31:in `block (4 levels) in <top (required)>'

your controller is where the mistake is. The find method automatically only returns the first result (it is equivalent in code to User.where(:id => params[:id]).first). Try removing the :first symbol and simply pass in id (User.find(id))

get "show", :id => @user

Your problem here is likely with @user, whose value in the context of your spec is not clear from the example you've posted. You should be passing an integer record id as the value for the params argument to get, for example :id => 1.