如何在rails中处理消息中的错误标志

Question

我在表单中将Ajax添加到我的签名中，当我输入真正的信息时，它会很好地工作，但是当我输入错误信息时，我无法处理错误消息。

sessions_controller.rb

class SessionsController < Devise::SessionsController
  skip_before_filter :verify_authenticity_token, :only => [:destroy, :create]

  def create
    self.resource = warden.authenticate!(auth_options)
    set_flash_message(:notice, :signed_in) if is_flashing_format?
    sign_in(resource_name, resource)
    yield resource if block_given?

    respond_to do |format|
      format.html { redirect_to root_path }
      format.js
    end
  end
end

形式上的签名

<div class="sign_in_modal">
  <div class="modal fade" id="sign_in" tabindex="-1" role="dialog" aria-labelledby="sign_in">
    <div class="modal-dialog" role="document">
      <div class="modal-content">
        <div class="modal-header">
          <h4 class="modal-title" id="myModalLabel">Login</h4>
        </div>
        <div class="modal-body">
          <%= form_for(resource, as: resource_name, url: user_session_path, remote: true) do |f| %>
            <div class="form-group">
              <%= f.label :username, 'Username' %>
              <%= f.text_field :username, autofocus: true, class: 'form-control txt-main', id: 'sign_in_auto_focus' %>
            </div>

            <div class="form-group">
              <%= f.label :password, 'Password' %>
              <%= f.password_field :password, autocomplete: "off", class: 'form-control txt-main' %>
            </div>

            <% if devise_mapping.rememberable? -%>
              <%= f.check_box :remember_me %>
              <%= f.label :remember_me, 'Save your login?' %>
            <% end -%>
        </div>
        <div class="modal-footer">
            <%= f.submit "Login", class: 'btn btn-main btn-md' %>
          <% end %>
        </div>
      </div>
    </div>
  </div>
</div>

create.js.erb

$('.sign_in_modal .modal').modal('hide');
$('.header h1').after('<p class="username"><%= current_user.username.capitalize %></p>');
$('.sign_up_and_in').remove();
$('.navbar-nav').append('<li><a tabindex="-1" title="Edit Account Setting" href="/users/edit"><i class="fa fa-cog fa-lg"></i><span style="display: none;"  class="cog-text">Edit Account Setting</span></a></li>');
$('.navbar-nav').append('<li><%= link_to sanitize('<i class="fa fa-sign-out fa-lg"></i><span style="display: none;" class="sign-out-text">LogOut</span>'), destroy_user_session_path, :method => :delete, :tabindex => -1, title: "LogOut" %></li>');

在这种情况下，我如何处理错误消息？

Answer 1

我通过覆盖会话控制器的新操作来解决这个问题，如下所示：

def new
  respond_to do |format|
    format.js
  end
end

如果用户输入真实用户名和密码将登录，如果输入错误的用户名或密码，则new.js.erb文件将运行并显示错误的数据消息。