anchor.diff:  </div>
   <div class="form-group">
     <%= f.label :published_at, :class => "left-side-label" %>
  -  <%= f.text_field :published_at, :id => "simple-blog-post-form-published-at", :class => "js-simple-blog-published-at form-control", :value => f.object.published_at.present? ? f.object.published_at.strftime("%d/%m/%Y") : "" %>
  +  <%= f.text_field :published_at, :id => "simple-blog-post-form-published-at", :class => "js-simple-blog-published-at form-control", :value => blog_post.published_at.present? ? blog_post.published_at.strftime("%d/%m/%Y") : "" %>
   </div>
   <div class="form-group">
     <%= f.label :tag_list, :class => "left-side-label" %>
  -  <%= f.text_field :tag_list, :class => "form-control js-simple-blog-tag-list", :id => "simple-blog-post-form-tag-list" %>
  +  <%= f.text_field :tag_list, :class => "form-control js-simple-blog-tag-list", :id => "simple-blog-post-form-tag-list", :value => blog_post.tag_list.to_s %>
   </div>
   <div class="form-group">
     <%= f.label :keyword_list, :class => "left-side-label" %>
  -  <%= f.text_field :keyword_list, :class => "form-control js-simple-blog-keyword-list", :id => "simple-blog-post-form-keyword-list" %>
  +  <%= f.text_field :keyword_list, :class => "form-control js-simple-blog-keyword-list", :id => "simple-blog-post-form-keyword-list", :value => blog_post.keyword_list.to_s %>
   </div>
   <% if @blog_images.present? %>
     <table class="table table-bordered">
  
positive.code: <%= render "form_errors", :obj => f.object %>
  <div class="form-group">
    <%= f.label :title %>
    <%= f.text_field :title, :id => "simple-blog-post-form-title", :class => "js-simple-blog-title form-control", :size => 100 %>
  
negative.code:     <% end %>
    </table>
  <% end %>
  <%= f.fields_for :images, blog_post.images.build do |i| %>
    <div class="form-group">
      <%= i.label :image %>
      <%= i.file_field :image, :id => "simple-blog-post-form-image" %>
  