title: found unpermitted parameters: utf8, authenticity_token only for update method
body: <p>I have the update method in user managements controller like this</p>
  
  <pre><code>def update
    @user.update(user_permitted_params)
    redirect_to admin_user_managements_path
  end
  </code></pre>
  
  <p>My strong parameters is set as </p>
  
  <pre><code>def user_permitted_params
    params.require(:user).permit(:name, :email, :password,
    :password_confirmation,
    :address, :zip_code,
    :phone_number, :role_id)
  end
  </code></pre>
  
  <p>I am getting following issue</p>
  
  <blockquote>
    <p>Unpermitted parameters: utf8, _method, authenticity_token, user, commit</p>
  </blockquote>