设计认证 - devise_error_messages！在一个视图中导致“undefined方法”错误为nil：NilClass [英] Devise authentication - devise_error_messages! in a view causes "undefined method `errors' for nil:NilClass

问题描述

devise_error_messages！在一个视图中导致

 未定义的方法'n'的错误：NilClass 
  $ 创建方法之后，pre $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $继承自Devise :: RegistrationsController而不是ApplicationController的RegistrationsController之后，就开始了。初始化新方法不会引起任何例外。
 
 
 
覆盖注册控制器：
  class RegistrationsController< Devise :: RegistrationsController 
 def create 
 begin 
 raise I18n.t（registration_disabled）除非registration_enabled？ 
 .................... 
 rescue => ex 
 flash [：alert] = ex.message 
 render：new 
 end 
 end 
 end 
  
视图注册/ new.html.erb：
  ; h2><％= I18n.t（sign_up_title）％>< / h2> 
 
<％= form_for（resource，：as => resource_name，：url => registration_path（resource_name））do | f | ％GT; 
<％= devise_error_messages！ ％GT; 
 
< div><％= f.label：login，I18n.t（the_login）％> < span class =mandatory> *< / span>< br /> 
<％= f.text_field：login％>< / div> 
 
< div><％= f.label：password，I18n.t（password）％> < span class =mandatory> *< / span>< br /> 
<％= f.password_field：password％>< / div> 
 
< div><％= f.label：password_confirmation，I18n.t（password_confirmation）％> < span class =mandatory> *< / span>< br /> 
<％= f.password_field：password_confirmation％>< / div> 
 
< div><％= f.submit from_admin？ ？ I18n.t（sign_up_other）：I18n.t（sign_up）％>< / div> 
< p class =mandatory> *  - <％= I18n.t（mandatory_fields）％>< / p> 
<％end％> 
 
<％= renderdevise / links％> 
  
 
 
解决方案
我相信这是因为你提前出现异常对象（devise称它为资源）被创建。 
  devise_error_messages 需要它帮助者。
 
 
 
如果您想阻止访问注册，还有其他方法可以实现：
 
 
 
一种方法可以是：
  class RegistrationsController< Devise :: RegistrationsController 
 def create 
如果registration_enabled？ 
 super 
 else 
 flash [：alert] = I18n.t（registration_disabled）
 redirect_to action：：new 
 end 
 end 
 end 
  
我不是100％肯定这是否可以工作，但这个想法是渲染视图如果用户无法注册，那么这样做会像初始渲染一样。
 
 
 
编辑：其实我相信改变你的
 渲染动作：：新
  
到
  redirect_to action：：new 
  
将足以防止错误，因为redirect_to将执行方法，而渲染只是呈现关联视图。
 
devise_error_messages! in a view causes
undefined method 'errors' for nil:NilClass
after render :new in create method. This started happening after I inherited RegistrationsController from "Devise::RegistrationsController" instead of "ApplicationController". Initial rendering of "new" method does not cause any exceptions.

Overridden registrations controller:
class RegistrationsController < Devise::RegistrationsController
  def create
    begin
      raise I18n.t("registration_disabled") unless registration_enabled?
      ....................
    rescue => ex
      flash[:alert] = ex.message
      render :new
    end
  end
end
The view registrations/new.html.erb:
<h2><%= I18n.t("sign_up_title") %></h2>

<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
    <%= devise_error_messages! %>

    <div><%= f.label :login, I18n.t("the_login") %> <span class="mandatory">*</span><br />
      <%= f.text_field :login %></div>

    <div><%= f.label :password, I18n.t("password") %> <span class="mandatory">*</span><br />
      <%= f.password_field :password %></div>

    <div><%= f.label :password_confirmation, I18n.t("password_confirmation") %> <span class="mandatory">*</span><br />
      <%= f.password_field :password_confirmation %></div>

    <div><%= f.submit from_admin? ? I18n.t("sign_up_other") : I18n.t("sign_up") %></div>
    <p class="mandatory">* - <%= I18n.t("mandatory_fields") %></p>
<% end %>

<%= render "devise/links" %>

解决方案
I believe it's because you're raising the exception before the object (devise calls it the resource) is created.
And it is needed by the devise_error_messages helper.

If you want to prevent access to the registration, there are other ways to achieve this:

One way could be :
class RegistrationsController < Devise::RegistrationsController
  def create
    if registration_enabled?
      super
    else
      flash[:alert] = I18n.t("registration_disabled")
      redirect_to action: :new
    end
  end
end
I'm not 100% sure if this would work but this idea is to render the view with the flash if user can't register, so this would behave as the "initial rendering"

EDIT : Actually I believe that changing your
render action: :new
to
redirect_to action: :new
would be enough to prevent the error as the redirect_to will execute the methode whereas the render just render the associate view.

                        
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