unit test failing

error - not averaging

attyc@appcity:~/workspace (comments) $ rspec
F

Failures:

  1) Product#average_rating when the product has comments returns the average rating of all comments
     Failure/Error: @product.comments.create!(:rating => 1, :user_id => 10, :body => "hello")
     ActiveRecord::RecordInvalid:
       Validation failed: User can't be blank
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/validations.rb:79:in `raise_record_invalid'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/validations.rb:43:in `save!'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/attribute_methods/dirty.rb:29:in `save!'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/transactions.rb:291:in `block in save!'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/transactions.rb:347:in `block in with_transaction_returning_status'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/transactions.rb:220:in `transaction'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/transactions.rb:344:in `with_transaction_returning_status'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/transactions.rb:291:in `save!'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/has_many_association.rb:39:in `insert_record'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/collection_association.rb:501:in `block (2 levels) in _create_record'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/collection_association.rb:408:in `replace_on_target'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/collection_association.rb:403:in `add_to_target'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/collection_association.rb:499:in `block in _create_record'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/collection_association.rb:183:in `block in transaction'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract/transaction.rb:188:in `within_new_transaction'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/transactions.rb:220:in `transaction'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/collection_association.rb:182:in `transaction'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/collection_association.rb:498:in `_create_record'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/has_many_association.rb:180:in `_create_record'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/collection_association.rb:157:in `create!'
     # /usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.2.1/lib/active_record/associations/collection_proxy.rb:306:in `create!'
     # ./spec/models/product_spec.rb:11:in `block (4 levels) in <top (required)>'

Finished in 0.07311 seconds (files took 4.02 seconds to load)
1 example, 1 failure

Failed examples:

rspec ./spec/models/product_spec.rb:16 # Product#average_rating when the product has comments returns the average rating of all comments

product.rb

class Product < ActiveRecord::Base
  has_many :orders
  has_many :comments
  
  def average_rating
    comments.average(:rating).to_f
  end
  validates :name, presence: true
end

product_spec.rb

require 'rails_helper' # also requires spec_helper and adds other stuff - if didnt need Rails just use spec_helper but unlikely

describe Product do
  
  describe "#average_rating" do # - the '#' signifies that we are testing an instance method - describe the method you will be testing (which belongs to the Class)
    
    #context 4, test 4
    context "when the product has comments" do # create context
      before do # before running the test...
        @product = Product.create!(:name => "ball")
        @product.comments.create!(:rating => 1, :user_id => 10, :body => "hello")
        @product.comments.create!(:rating => 3, :user_id => 11, :body => "good")
        @product.comments.create!(:rating => 5, :user_id => 12, :body => "night")
      end

      it 'returns the average rating of all comments' do
        expect(@product.average_rating).to eq 3
      end
    end
    
    
    #context 5, test 5
   #context "when the product has no rating" do # create context
      #before do # before running the test...
       # @product = Product.create(:name => "ball")
       # @product.comments.create(:rating => '', :user_id => 10, :body => "hello")
      #end

     # it 'returns falsy' do
        #expect(@product.average_rating).to be_nil
      #end
    #end
  
  end #end describe #average_rating     
  
end #end describe Product