title: ActiveModel::MassAssignmentSecurity::Error in PostsController#create
body: <p>I'm almost finished step 11 on <a href="http://guides.rubyonrails.org/getting_started.html" rel="nofollow">http://guides.rubyonrails.org/getting_started.html</a> .
  There is something wrong with my tags though, i keep getting this when trying to create a new post.</p>
  
  <p><strong>ActiveModel::MassAssignmentSecurity::Error in PostsController#create</strong></p>
  
  <p>Can't mass-assign protected attributes: tags_attributes
  Rails.root: /Users/david/blog</p>
  
  <p>Application Trace | Framework Trace | Full Trace
  app/controllers/posts_controller.rb:46:in <code>new'
  app/controllers/posts_controller.rb:46:in</code>create'
  Request</p>
  
  <p>Parameters:</p>
  
  <pre><code>    {"post"=&gt;{"name"=&gt;"David",
      "content"=&gt;"Foobar",
      "title"=&gt;"Programmer",
      "tags_attributes"=&gt;{"0"=&gt;{"name"=&gt;"Tea,
      Cake"}}},
      "utf8"=&gt;"✓",
      "commit"=&gt;"Create Post",
      "authenticity_token"=&gt;"MhvAkAPcAey1Z4YXy7nKFmW/wETlu+USSvWOEBBN4po="}
  </code></pre>
  
  <p>I've been over and over every line of code containing the implementation of tags, and i can't figure it out.  Some guidance to what i should be looking for? </p>
  
  <p>Thank you.</p>