Tests for Devise user that has polymorphic profiles - ruby-on-rails

Question

My application has an User model that belongs_to :profile, :polymorphic => true. This profile can be Student, Manager, Enterprise or Employee and it needs to be approved, by its administrator, to log on the system. I used this approval approach.
I'm having a little troubles with the test part. It always outputs:
1) Error:
test_should_get_dashboard(ManagersControllerTest):
NoMethodError: undefined method `approved' for nil:NilClass
Probably relevant sources:
class User < ActiveRecord::Base
belongs_to :profile, :polymorphic => true
attr_accessible :approved
end
class ManagersControllerTest < ActionController::TestCase
include Devise::TestHelpers
fixtures :managers
fixtures :users
def setup
manager = Manager.create(:name => 'Manager', :cpf => '537.846.919-86')
#user = User.new(:email => 'user#user.com', :password => 'user#user.com')
#user.approved = true
#user.profile = manager
#user.save!
end
test "should get dashboard" do
sign_in #user
get :dashboard
assert_response :redirect
assert_redirected_to managers_root_path
end
end
class ManagersController < ApplicationController
def dashboard
p = Proc.new { |e| [e.name, e.id] if e.user.approved }
app_en = Enterprise.all.map(&p).compact.count
napp_en = Enterprise.count - app_en
app_em = Employee.all.map(&p).compact.count
napp_em = Employee.count - app_em
#app = [ app_en, app_em, 0 ]
#napp = [ napp_en, napp_em, 0 ]
#total = [ app_en + napp_en, app_em + napp_em, Student.count ]
tags_count = Activity.tag_counts.map(&:count)
#tags = Hash[Activity.tag_counts.map(&:name).zip(tags_count)]
#user = current_user
end
end
As I'm having troubles with the fixtures written, I'm ignoring them, but I would be very thankful if someone show a solution with fixtures. Even this way I'm getting stuck in this error. What should I do?
The Stack
/home/waldyr/Dropbox/Workspace/Rails/bancodevagas/app/controllers/managers_controller.rb:7:in `block in dashboard'
/home/waldyr/Dropbox/Workspace/Rails/bancodevagas/app/controllers/managers_controller.rb:8:in `map'
/home/waldyr/Dropbox/Workspace/Rails/bancodevagas/app/controllers/managers_controller.rb:8:in `dashboard'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/abstract_controller/base.rb:167:in `process_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/metal/rendering.rb:10:in `process_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/abstract_controller/callbacks.rb:18:in `block in process_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/callbacks.rb:425:in `_run__2212830968385571096__process_action__4077155092621945467__callbacks'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/callbacks.rb:405:in `__run_callback'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/callbacks.rb:81:in `run_callbacks'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/abstract_controller/callbacks.rb:17:in `process_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/metal/rescue.rb:29:in `process_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/notifications.rb:123:in `block in instrument'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/notifications.rb:123:in `instrument'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/metal/instrumentation.rb:29:in `process_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/metal/params_wrapper.rb:206:in `process_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.6/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/abstract_controller/base.rb:121:in `process'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/abstract_controller/rendering.rb:45:in `process'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/metal/testing.rb:17:in `process_with_new_base_test'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/test_case.rb:469:in `process'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/test_case.rb:49:in `process'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/devise-2.1.2/lib/devise/test_helpers.rb:19:in `block in process'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/devise-2.1.2/lib/devise/test_helpers.rb:71:in `catch'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/devise-2.1.2/lib/devise/test_helpers.rb:71:in `_catch_warden'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/devise-2.1.2/lib/devise/test_helpers.rb:19:in `process'
/home/waldyr/.rvm/gems/ruby-1.9.2-p320/gems/actionpack-3.2.6/lib/action_controller/test_case.rb:386:in `get'
/home/waldyr/Dropbox/Workspace/Rails/bancodevagas/test/functional/manager_controller_test.rb:24:in `block in <class:ManagersControllerTest>'

Answer 1

The answer appears to be that not all the Enterprise or Employee models actually have an associated user. When using map to e.user.approved, the controller tries to pass .approved to user which can be nil in this case.
One simple solution is to change your Proc to be nil safe:
p = Proc.new { |e| [e.name, e.id] if e.user && e.user.approved }