Ruby on rails Rails 3的联系人表单中没有方法错误

我使用以下教程将一个联系人表单组合在一起：

我已经按照所有说明进行了操作，但由于某些原因，我在尝试访问我的应用程序中的联系人页面时一直出现此错误：

NoMethodError in Contact#new

undefined method `[]' for nil:NilClass
Extracted source (around line #1):

1: <%= form_for @message, :url => contact_path do |form| %>
2:   <fieldset class="fields">
3:     <div class="field">
4:       <%= form.label :name %>

NoMethodError处于接触状态#新增
nil:NilClass的未定义方法“[]”
提取的源（第1行附近）：
1:联系方式|表格|%>
2:   
三：
4:       

我错过了什么

new.html.erb

<%= form_for @message, :url => contact_path do |form| %>
<fieldset class="fields">
<div class="field">
  <%= form.label :name %>
  <%= form.text_field :name %>
</div>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>
<div class="field">
  <%= form.label :subject %>
  <%= form.text_field :subject %>
</div>

<div class="field">
  <%= form.label :body %>
  <%= form.text_area :body %>
</div>
</fieldset>

<fieldset class="actions">
<%= form.submit "Send" %>
</fieldset>
<% end %>

class ContactController < ApplicationController

def new
  @message = Message.new
end

def create
  @message = Message.new(params[:message])

if @message.valid?
  NotificationsMailer.new_message(@message).deliver
  redirect_to(root_path, :notice => "Message was successfully sent.")
else
  flash.now.alert = "Please fill all fields."
  render :new
end
end
end

class NotificationsMailer < ActionMailer::Base

default :from => "myemail@gmail.com"
default :to => "myemail@gmail.com"

def new_message(message)
  @message = message
  mail(:subject => "[myemail@gmail.com] #{message.subject}")
end
end

contact|u path do| form|%>

联系控制器。rb

<%= form_for @message, :url => contact_path do |form| %>
<fieldset class="fields">
<div class="field">
  <%= form.label :name %>
  <%= form.text_field :name %>
</div>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>
<div class="field">
  <%= form.label :subject %>
  <%= form.text_field :subject %>
</div>

<div class="field">
  <%= form.label :body %>
  <%= form.text_area :body %>
</div>
</fieldset>

<fieldset class="actions">
<%= form.submit "Send" %>
</fieldset>
<% end %>

class ContactController < ApplicationController

def new
  @message = Message.new
end

def create
  @message = Message.new(params[:message])

if @message.valid?
  NotificationsMailer.new_message(@message).deliver
  redirect_to(root_path, :notice => "Message was successfully sent.")
else
  flash.now.alert = "Please fill all fields."
  render :new
end
end
end

class NotificationsMailer < ActionMailer::Base

default :from => "myemail@gmail.com"
default :to => "myemail@gmail.com"

def new_message(message)
  @message = message
  mail(:subject => "[myemail@gmail.com] #{message.subject}")
end
end

class ContactController“消息已成功发送”。）
其他的
flash.now.alert=“请填写所有字段。”
渲染：新
结束
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通知\u mailer.rb

<%= form_for @message, :url => contact_path do |form| %>
<fieldset class="fields">
<div class="field">
  <%= form.label :name %>
  <%= form.text_field :name %>
</div>

<div class="field">
  <%= form.label :email %>
  <%= form.text_field :email %>
</div>
<div class="field">
  <%= form.label :subject %>
  <%= form.text_field :subject %>
</div>

<div class="field">
  <%= form.label :body %>
  <%= form.text_area :body %>
</div>
</fieldset>

<fieldset class="actions">
<%= form.submit "Send" %>
</fieldset>
<% end %>

class ContactController < ApplicationController

def new
  @message = Message.new
end

def create
  @message = Message.new(params[:message])

if @message.valid?
  NotificationsMailer.new_message(@message).deliver
  redirect_to(root_path, :notice => "Message was successfully sent.")
else
  flash.now.alert = "Please fill all fields."
  render :new
end
end
end

class NotificationsMailer < ActionMailer::Base

default :from => "myemail@gmail.com"
default :to => "myemail@gmail.com"

def new_message(message)
  @message = message
  mail(:subject => "[myemail@gmail.com] #{message.subject}")
end
end

class NotificationsMailer”myemail@gmail.com"
默认值：to=>”myemail@gmail.com"
def新建_消息（消息）
@消息=消息
邮件（：主题=>）[myemail@gmail.com]#{message.subject}”）
结束
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我在本教程中遇到了类似的问题。这是因为我忘了从Message类中删除

。我还忘了将

attr\u accessible

更改为

attr\u accessor

。您可能需要再次检查这两点。

您的路线设置正确吗？是的，路线绝对不错。还有其他想法吗？我认为有两种可能性。您的消息模型可能有问题，或者您应该重新启动服务器。