在不同视图中设计表单“ nil：NilClass的未定义方法'[]'”； [英] Devise form within different view "undefined method `[]' for nil:NilClass"

问题描述

因此，我试图做与在其他控制器中设计表单几乎相同的事情

完全在另一页上设计登录表单

我有一个辅助模块，该模块具有

I have a helper module that has

def resource_name
  :user
end

def resource
  @resource ||= User.new
end

def devise_mapping
  @devise_mapping ||= Devise.mappings[:user]
end

但是我得到的是未定义的方法'[]'对于行上的nil：NilClass

<%= f.email_field :email, :autofocus => true %></div>

我在视图/设计/会话/new.html中将<％提高resource.inspect％> .erb

I put <% raise resource.inspect %> in views/devise/sessions/new.html.erb

，而我在Home＃index #User not initialized

and I got RuntimeError in Home#index #User not initialized

<h2>Sign in</h2>

<%= form_for(resource, :as => resource_name, :url => user_session_path(resource_name)) do |f| %>
  <% raise resource.inspect %>
  <div><%= f.label :email %><br />
  <%= f.email_field :email, :autofocus => true %></div>

  <div><%= f.label :password %><br />
  <%= f.password_field :password %></div>

  <% if devise_mapping.rememberable? -%>
  <div><%= f.check_box :remember_me %> <%= f.label :remember_me %></div>
  <% end -%>

  <div><%= f.submit "Sign in" %></div>
<% end %>

<%= render "devise/shared/links" %>

我也为辅助程序模块尝试过此操作

and I also tried this for the helper module

def resource_name
  :user
end

def resource
  @resource = User.new
end

def devise_mapping
  @devise_mapping = Devise.mappings[:user]
end

在Home＃index中，我有以下

In Home#index, I have the following

<div class="loginform" id="login">
  <%= render :file => "devise/sessions/new" %>
</div>

如果视图/设计错误，错误为nil：NilClass的未定义方法'[]'将消失/sessions/new.html.erb编辑为

The error "undefined method `[]' for nil:NilClass" will be gone if views/devise/sessions/new.html.erb edits to be

<%= form_for(:user, :as => @user, :url => user_session_path(@user)) do |f| %>

，但如果放置<％提高资源。检查％>，则返回视图/设计/会话/新.html.erb

but if put <% raise resource.inspect %> back in views/devise/sessions/new.html.erb

仍会得到#User未初始化>

will still get #User not initialized>

在user.rb

devise :database_authenticatable, :registerable, :confirmable,
     :recoverable, :rememberable, :trackable, :validatable

在application_controller.rb

In application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
  helper :all
end

使用'rails'，'3.2.11'

using 'rails', '3.2.11'

我不确定为什么辅助模块不能像它预期的那样工作。谁能帮助我了解原因？以及为什么要为nil：NilClass获取未定义的方法'[]'？

I am not sure why the helper module doesn't work the way it supposes be for resource. Can anyone help me to understand why? and why getting "undefined method `[]' for nil:NilClass" ?

谢谢。

推荐答案

我认为这行

<%= form_for(:user, :as => @user, :url => user_session_path(@user)) do |f| %>

应该是

<%= form_for(@user, :as => :user, :url => user_session_path(@user)) do |f| %>

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