为什么设计不在登录页面上显示身份验证错误？ [英] Why is devise not displaying authentication errors on sign in page?

问题描述

我正在使用rails 4.2

我有一个名为devise_helper.rb的帮助文件

 模块DeviseHelper 
 def devise_error_messages！ 
 return如果resource.errors.empty？ 
 
 messages = resource.errors.full_messages.map {| msg | content_tag（：li，msg）} .join 
 sentence = I18n.t（errors.messages.not_saved，
 count：resource.errors.count，
 resource：resource.class。 model_name.human.downcase）
 
 html =< -HTML 
< div class =row> 
< div class =large-12 columns> 
< div data-alert class =alert-box alert radius> 
< h4>＃{sentence}< / h4> 
< ul>＃{messages}< / ul> 
< / div> 
< / div> 
< / div> 
 HTML 
 html.html_safe 
 end 
 end 
  

自定义错误消息，它适用于注册和密码页面，但不适用于会话页面。为什么是这样？我知道我可以添加如下内容：

 < div class =row> 
<％if通知％> 
< div data-alert class =alert-box info radius> 
<％= notice％><％= link_toX，'＃'，：class => 'close'％> 
< / div> 
<％end％> 
<％如果警报％> 
< div data-alert class =alert-box alert radius> 
<％= alert％><％= link_toX，'＃'，：class => 'close'％> 
< / div> 
<％end％> 
< / div> 
  

对我的application.html.erb文件和错误消息将显示在那里，但我不明白为什么我必须补充说，当我有设备帮手已经。
对于密码和注册，我只需要添加<％= devise_error_messages！ ％>但是会话页面似乎不会这样工作。我不知道这是只是如何工作，还是有缺少的东西。

编辑：
我生成会话控制器，但是我从来没有改变任何内容。从我的理解，设计只会使用其默认控制器，直到我更改我生成的。我的密码控制器也是这样的。我已经对注册控制器进行了一些修改以配置允许的参数。

  class Users :: SessionsController< Devise :: SessionsController 
 
 end 
  

解决方案

p>具有空白/错误字段的登录不会在模型上触发（您的）验证，因此不会显示验证错误！

如果您使用 byebug （在您的视图的第一行）进行调试，您会注意到

  resource.errors.count＃=> 0 
 flash＃=> .... @ flash = {alert=>无效的电子邮件或密码。} 
  

Devise使用特定的登录错误消息填充警报闪存，这个登录的上下文是唯一的。

为什么看不到所有的模型验证错误消息？因为没有意义：假设你的模型有一个强制性的：gender 属性与 validates_presence_of：gender 。如果添加了正常模型错误，那么您的用户尝试以错误的登录名登录时，您还会看到错误列表中的性别不能为空白：oops：。

devise_error_messages！是一种特定的设计方法，旨在显示这些特定的错误。您可以将其视为对用于登录的字段（并在您的设计配置文件中定义）的部分验证。

替代方法： / strong>

如果您真的想显示所有错误消息，您可以明确地运行验证：

开头的 devise_error_messages！

  resource.validate＃将生成错误并填充`resource.errors` 
  

我相信不应该搞砸其他动作这已经很好了（注册等）

I'm using rails 4.2

I have a helper file called devise_helper.rb

module DeviseHelper
    def devise_error_messages!
        return "" if resource.errors.empty?

    messages = resource.errors.full_messages.map { |msg| content_tag(:li, msg) }.join
    sentence = I18n.t("errors.messages.not_saved",
                  count: resource.errors.count,
                  resource: resource.class.model_name.human.downcase)

     html = <<-HTML
     <div class="row">
     <div class="large-12 columns">
        <div data-alert class="alert-box alert radius">
          <h4>#{sentence}</h4>
          <ul>#{messages}</ul>
        </div>
     </div>
     </div>
     HTML
     html.html_safe
  end
end

to customize error messages and it's working for registrations and passwords pages, but not for sessions pages. Why is this? I know that I can add something like this:

  <div class="row">
    <% if notice %>
      <div data-alert class="alert-box info radius">
        <%= notice %><%= link_to "X", '#', :class => 'close' %>
      </div>
    <% end %>
    <% if alert %>
      <div data-alert class="alert-box alert radius">
        <%= alert %><%= link_to "X", '#', :class => 'close' %>
      </div>
    <% end %>
  </div>

To my application.html.erb file and error messages will display there, but I don't understand why I have to add that when I have the devise helper already. For the passwords and registrations, I just had to add <%= devise_error_messages! %> but the sessions pages don't seem to work that way. I'm not sure if this is just how devise works or if there's something I'm missing.

EDIT: I generated the sessions controller but I never changed anything in it since generating it. From what I understand, devise will just use its default controller until I change the one i generated. My passwords controller is like this as well. I did make some changes to the registrations controller to configure permitted parameters.

class Users::SessionsController < Devise::SessionsController

end

解决方案

A login with blank/wrong fields does not trigger (your) validations on the model, and therefore won't show your validation errors !

if you debug with byebug (in the first line of your view for example), you'll notice

resource.errors.count # => 0
flash # => ....@flashes={"alert"=>"Invalid email or password."}

Devise populates the "alert flash" with specific sign in error messages unique to this context of sign-in.

Why do you not see all model validation error messages ? Because that wouldn't make sense : suppose your model has a mandatory :gender attribute with validates_presence_of :gender. If normal model errors were added, then you would also see "gender cannot be blank" in the list of errors when your user tries to sign in with a wrong login :oops:.

devise_error_messages! is a specific devise method meant to show those specific errors. You can think of it as a partial validation on the fields that are used for sign in (and that are defined in your devise config file)

WORKAROUND :

If you really want to show all your error messages, you could just explicitely run the validations :

at the beginning of devise_error_messages!

resource.validate # It will generate errors and populate `resource.errors`

I believe it shouldn't mess up with other actions that already work well (register, etc.)

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