Error self.user.update_attribute undefined method nil:Class - ruby-on-rails

Question

UPDATE POST I'm noob in RoR and i start the test. I have an application and I try to use test with rspec and capybara, I want create user and test the login. But when i do my test i have some error with my models users, because in my app I create user and i call an after_create :create_order
I modify my factories.rb but i have an error in my update_attributes
See my model user.rb
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :token_authenticatable, :confirmable,
# :lockable, :timeoutable and :omniauthable
has_many :ratings
has_many :rated_sounds, :through => :ratings, :source => :sounds
has_many :sounds ,:dependent => :destroy
has_many :orders ,:dependent => :destroy
has_many :song_ups ,:dependent => :destroy
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable,
:registerable, :confirmable
# Setup accessible (or protected) attributes for your model
attr_accessible :email, :password, :password_confirmation, :remember_me,
:nom, :prenom, :societe, :tel, :cgu, :sign_in_count, :trans_simu,
:trans_limit, :project, :vat_number, :adress, :zip_code, :city, :tutorial
after_create :create_order
def create_order
order = Order.create(user_id: self.id,files_left: 3)
order.subscription = Subscription.where(category: 'test').first || Subscription.create(category: 'test')
self.update_attribute(:trans_limit, 1)
#Ancien Order
# Order.create(user_id: self.id, subscription_id: Subscription.where(category: 'test').first.id, files_left: 3)
# self.update_attribute(:trans_limit, 1)
end
def test?
self.orders.trial.present? && self.orders.count==1
end
def unlimited?
!self.test? && self.orders.current.where(time_left: -1).any?
end
def allow_send?
!self.finish_order? && self.sounds.in_progress.count < self.trans_limit.to_i
end
def finish_order?
self.orders.current.empty?
end
end
For create my user in my test I use FactoryGirl. And i write this :
require 'factory_girl'
FactoryGirl.define do
factory :user do
sequence(:email) {|n| "email#{n}#factory.com" }
password "foobar"
password_confirmation "foobar"
societe "RspecTest"
prenom "John"
nom "Doe"
tel "0101010101"
confirmed_at Time.now
association :order
end
factory :order do
association :subscription
end
factory :subscription do
end
end
And one of my test is :
scenario "User login right" do
visit new_user_session_path
current_path.should == "/users/sign_in"
page.html.should include('<h2>Se connecter</h2>')
user = FactoryGirl.create(:user)
fill_in "Email", :with => user.email
fill_in "Mot de passe", :with => user.password
check "user_remember_me"
click_button "Connexion"
page.should have_content('Mon compte')
current_path.should == root_path
end
My order.rb
class Order < ActiveRecord::Base
attr_accessible :nb_files, :user_id, :period, :time_left, :subscription_id, :promo_id, :promo_end_date, :max_time_file, :files_left, :ended_at
belongs_to :user
belongs_to :subscription
scope :current, where('files_left != ? AND time_left != ? AND (ended_at >= ? OR ended_at IS ?)', 0, 0, Time.now, nil)
before_create :init_value
def self.trial
self.where(subscription_id: Subscription.where(category: 'test').first.id).first
end
def init_value
self.time_left = self.subscription.trans_seconds
self.max_time_file = self.subscription.max_time_file
if self.subscription.category != 'test'
self.user.update_attribute(:trans_limit, 1)
Order.where(user_id: self.user_id, subscription_id: Subscription.where(category: 'test')).destroy_all
else
self.files_left = 3
end
end
end
My error :
Failure/Error: user = FactoryGirl.create(:user)
NoMethodError:
undefined method `trans_seconds' for nil:NilClass
# ./app/models/order.rb:13:in `init_value'
# ./app/models/user.rb:21:in `create_order'
I hope you can help me. Thank's

Answer 1

You don't have Subscription with category 'test' in your database. Solution depend on how you want to handle this kind of error.
If you expect this subscription always to be in your database, use db:seed rake task for prepopulating your db. (try googling it to find out how to do this)
If you don't want to assign any subscription if given doesn't exist try:
def create_order
order = Order.create(user_id: self.id,files_left: 3)
order.subscription = Subscription.where(category: 'test').first
self.update_attribute(:trans_limit, 1)
end
And finally, if you want to create such a subscription if it doesn't exist:
def create_order
order = Order.create(user_id: self.id,files_left: 3)
order.subscription = Subscription.find_or_create_by_category('test')
self.update_attribute(:trans_limit, 1)
end

Answer 2

In create_order try using this:
Order.create!(user: self, subscription: Subscription.where(category: 'test').first, files_left: 3)
Use objects instead of plain ids.
On before_* methods
To make sure that validations pass, return true at the end of these methods. In your case, add return true at the end of the init_value method.