<%= simple_form_for(@column, url: backend_content_row_columns_path(@row)) do |f| %>
  <div class="card">
    <div class="card-header">
      <%= t 'b.edit_column' %>
    </div>

    <div class="card-block">
      <div class="row">
        <div class="col-md-6">
          <%= f.input :width, as: :integer %>
        </div>

        <div class="col-md-6">
          <%= f.input :content_type, collection: options_for_content_types, disabled: true, include_blank: false %>
        </div>
      </div>
    </div>
  </div>

  <%= render 'backend/form_actions', cancel_url: cancel_url %>
<% end %>

<%= simple_form_for(@column, url: backend_content_row_column_path(@row, @column)) do |f| %>
  <div class="card">
    <div class="card-header">
      <%= t 'b.edit_column' %>
    </div>

    <div class="card-block">
      <div class="row">
        <div class="col-md-6">
          <%= f.input :width, as: :integer %>
        </div>

        <div class="col-md-6">
          <%= f.input :content_type, collection: options_for_content_types, disabled: true, include_blank: false %>
        </div>
      </div>
    </div>
  </div>

  <%= render 'backend/form_actions', cancel_url: cancel_url %>
<% end %>

Fix column edit form action.
Fix column edit form action.
