app/views/roles/edit.html.erb

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<%= form_for @role do |f| %>
  <div class="box-header">
    <h3 class="box-title">Edit Role</h3>
    <div class="box-tools pull-right">
      <div class="btn-group">
        <%= link_to "Cancel",roles_path, class: "btn btn-danger" %>
      </div>

      <%= f.submit "Update", class: "btn btn-primary" %>
    </div>
  </div>
  <div class="box-body">
      <div class="form-group">
        <%= f.label :name %>
        <%= f.text_field :name, class: "form-control"%>
      </div>
  </div>
<% end %>