title: expected result to have changed by 1, but was changed by 0
body: <p>I'm new to RSpec and this error is all new to me. Everything seems routine so I can't seem to debug this issue myself. ERROR: expected result to have changed by 1, but was changed by 0. I'll post my code for clarity.</p>
  
  <p>SUBSCRIBER FACTORY:</p>
  
  <pre><code>FactoryGirl.define do
  factory :subscriber do
   first_name "Tyler"
   last_name "Durden"
   email "tyler@example.com"
   phone_number "8765555"
  end
  end
  </code></pre>
  
  <p>CONTROLLER: </p>
  
  <pre><code> class CommentsController &lt; ApplicationController
   def new
    @comment = Comment.new
   end
  
   def create
    @subscriber = Subscriber.order('updated_at desc').first
    @comment = @subscriber.comments.build(comments_params)
   if @comment.save
    flash[:notice] = "Thank you!"
    redirect_to subscribers_search_path(:comments)
   else
    render "new"
   end
  end
  
  private
  
  def comments_params
   params.require(:comment).permit(:fav_drink, :subscriber_id)
  end
  end
  </code></pre>
  
  <p>SPEC:</p>
  
  <pre><code>require "rails_helper"
  
  describe SubscribersController do
  include Devise::TestHelpers
  
  let(:user) { FactoryGirl.create(:user) }
  let(:subscriber) { FactoryGirl.attributes_for(:subscriber) }
  
  it "creates a new comment" do
    sign_in(user)
    comment = FactoryGirl.attributes_for(:comment)
  
    expect { post :create, subscriber: subscriber, comment: comment }.to change{ Comment.count }.by(1)
  end
  end
  </code></pre>
  
  <p>ERROR:</p>
  
  <pre><code>  Failure/Error: expect { post :create, subscriber: subscriber, comment: comment }.to change{ Comment.count }.by(1)
     expected result to have changed by 1, but was changed by 0
   # ./spec/controllers/comment_spec.rb:13:in `block (2 levels) in &lt;top (required)&gt;'
  </code></pre>