title: How to delete asset in nested_form through carrierwave?
body: <p>Good day.
  Has somebody working solution for deleting asset in nested form in Carrierwave?</p>
  
  <h1>MODEL</h1>
  
  <pre><code>has_many :article_images, :dependent =&gt; :destroy    
  accepts_nested_attributes_for :article_images
  
  mount_uploader :image, ImageUploader    
  belongs_to :article, :polymorphic =&gt; true
  </code></pre>
  
  <h1>schema.rb</h1>
  
  <pre><code>create_table "article_images", :force =&gt; true do |t|
  t.string "image"
  t.string "article_id"
  end
  
  create_table "articles", :force =&gt; true do |t|
  t.string "title"
  end
  </code></pre>
  
  <h1>CONTROLLER</h1>
  
  <pre><code>def edit
  @article = Article.find(params[:id])
  @article.article_images.build
  end
  </code></pre>
  
  <h1>VIEW</h1>
  
  <pre><code>_form.html.erb
  &lt;%= f.fields_for :article_images do |article_image| %&gt;
  &lt;% if article_image.object.new_record? %&gt;
  &lt;%= article_image.file_field :image %&gt;
  &lt;% else %&gt;
  &lt;%= image_tag(article_image.object.image.url(:thumb)) %&gt;
  &lt;%= article_image.check_box :remove_image %&gt; #DON'T WORK
  &lt;% end %&gt;
  &lt;% end %&gt;
  </code></pre>