未定义的局部变量或方法`城市'ROR

我创建了一个表格，使用scaffold，然后创建Models来制作一个nested model但我的浏览器出现错误，我无法解决它，我在这里寻找帮助，这个错误：未定义的局部变量或方法`城市'ROR

NameError in Clients#new 
    line #33 raised: 

undefined local variable or method `city' for #<#<Class:0xc4fb5bc>:0xb704f94> 

Extracted source (around line #33): 

30:  <% end %> 
31: </div> 
32: <div class="field"> 
33:  <%= city.fields_for :street do |street| %> 
34:  <%= street.label :street %> 
35:  <%= street.text_field :name %> 
36:  <% end %>

Client.rb

class Client < ActiveRecord::Base 
    attr_accessible :email, :name 
    has_one :city 
    accepts_nested_attributes_for :city 
end

city.rb

class City < ActiveRecord::Base 
    attr_accessible :client_id, :name 
    belongs_to :client 
    has_many :streets 
    accepts_nested_attributes_for :streets 
end

[由脚手架生成]

def new 
    @client = Client.new 
    @city = @client.build_city 
    @street = @city.build_street # I don't know should I add this line or not 

    respond_to do |format| 
     format.html # new.html.erb 
     format.json { render json: @client } 
    end 

    end

形式street.rb

class Street < ActiveRecord::Base 
    attr_accessible :city_id, :name 
    belongs_to :city 
end

clients_controller.rb

<%= form_for(@client) do |f| %> 
    <% if @client.errors.any? %> 
    <div id="error_explanation"> 
     <h2><%= pluralize(@client.errors.count, "error") %> prohibited this client from being saved:</h2> 

     <ul> 
     <% @client.errors.full_messages.each do |msg| %> 
     <li><%= msg %></li> 
     <% end %> 
     </ul> 
    </div> 
    <% end %> 

    <div class="field"> 
    <%= f.label :name %><br /> 
    <%= f.text_field :name %> 
    </div> 
    <div class="field"> 
    <%= f.label :email %><br /> 
    <%= f.text_field :email %> 
    </div> 
    <div class="field"> 
    <%= f.fields_for :city do |city| %> 
    <%= city.label :city %> 
    <%= city.text_field :name %> 
     <%= city.fields_for :street do |street| %> 
    <%= street.label :street %> 
    <%= street.text_field :name %> 
    <% end %> 
    <% end %> 
    </div> 
    <div class="field"> 

    </div> 

    <div class="actions"> 
    <%= f.submit "Submit Client", class: "btn btn-large btn-primary" %> 
    </div> 
<% end %>

的routes.rb

resources :clients do 
    resources :cities do 
     resources :streets 
    end 
    end

来源

2013-05-04 Mostafa Hussein

你必须改变哟UR模式：

class City < ActiveRecord::Base 
    attr_accessible :client_id, :name 
    belongs_to :client 
    has_many :streets 
    accepts_nested_attributes_for :streets # add the "s"! 
end

而且你必须修改_form.html.erb

<%= city.fields_for :streets do |street| %> ## add also the "s" 
    <%= street.label :street %> 
    <%= street.text_field :name %> 
<% end %>

而且你还必须修改您的控制器像mind.blank他回答说。

顺便说一句，也许这可以帮助您在一般的理解accepts_nested_attributes_for好一点..

来源

2013-05-04 14:49:03 Mattherick

我没有和我的客户得到了以下NameError＃新 /_form.html.erb其中线＃29提出：未定义的局部变量或方法'城市”为＃<＃<类别：0xb9b0e8c> ：0xb9aeed4> 提取的源（围绕线＃29）： 26：\t <% end %> 27：

28： 29：\t <％= city.fields_for：街道做|街道| ％> 30：\t <％= street.label：街道％> 31：\t <％= street.text_field：名称％> 32：\t <% end %> – 2013-05-04 14:52:21

我修改了我的答案 – Mattherick 2013-05-04 14:56:56

它提出了同样的错误 – 2013-05-04 15:02:00

还要确保您使用build_association为has_one协会，associations.build为has_many。

# has_one :city 
@city = @client.build_city 

# has_many :streets 
@street = @city.streets.build

来源

2013-05-04 14:52:01

未定义的局部变量或方法`城市'ROR

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