如何解决simple_form_for错误:未定义的方法-关联的模型
| 在我的rails应用程序中,我有两个关联的模型,分别称为Magazine和Article。 杂志class Magazine < ActiveRecord::Base
has_many :articles
end
文章
class Article < ActiveRecord::Base
belongs_to :magazine
end
路线
Magazineapp::Application.routes.draw do
resources :magazines do
resources :articles
end
end
schema.rb
create_table \"articles\",:force => true do |t|
t.string \"title\"
t.string \"author\"
t.integer \"magazine_id\"
t.datetime \"created_at\"
t.datetime \"updated_at\"
end
create_table \"magazines\",:force => true do |t|
t.string \"title\"
t.datetime \"created_at\"
t.datetime \"updated_at\"
end
我正在尝试从文章的新页面创建与杂志相关的新文章。因此,我在杂志的显示页面上创建了一个链接,以将所选杂志传递到新文章的页面。
views / magazines / show.html.erb
<p id=\"notice\"><%= notice %></p>
<p>
<b>Title:</b>
<%= @magazine.title %>
</p>
<%= link_to \'Edit\',edit_magazine_path(@magazine) %> |
<%= link_to \'Back\',magazines_path %> |
<%= link_to \'New Article\',new_magazine_article_path(@magazine) %>
在文章的新页面中呈现的部分内容是:
views / articles / _form.html.erb
<%= simple_form_for([@magazine,@article]) do |f| %>
<%= f.error_notification %>
<div class=\"inputs\">
<%= f.input :title %>
<%= f.input :author %>
</div>
<div class=\"actions\">
<%= f.button :submit %>
</div>
<% end %>
从文章的控制器创建方法是:
def create
@magazine = Magazine.find(params[:magazine_id])
@article = @magazine.articles.create(params[:article])
respond_to do |format|
if @article.save
format.html { redirect_to(@article,:notice => \'Article was successfully created.\') }
format.xml { render :xml => @article,:status => :created,:location => @article }
else
format.html { render :action => \"new\" }
format.xml { render :xml => @article.errors,:status => :unprocessable_entity }
end
end
end
但是,当我尝试创建与该杂志相关的新文章时,我收到了错误消息:
Showing /home/wilson/magazineapp/app/views/articles/_form.html.erb where line #1 raised:
undefined method `articles_path\' for #<#<Class:0x00000001944070>:0x00000001926ed0>
Extracted source (around line #1):
1: <%= simple_form_for([@magazine,@article]) do |f| %>
2: <%= f.error_notification %>
3:
4: <div class=\"inputs\">
Request
Parameters:
{\"magazine_id\"=>\"2\"}
耙路
magazine_articles GET /magazines/:magazine_id/articles(.:format) {:action=>\"index\",:controller=>\"articles\"}
POST /magazines/:magazine_id/articles(.:format) {:action=>\"create\",:controller=>\"articles\"}
new_magazine_article GET /magazines/:magazine_id/articles/new(.:format) {:action=>\"new\",:controller=>\"articles\"}
edit_magazine_article GET /magazines/:magazine_id/articles/:id/edit(.:format) {:action=>\"edit\",:controller=>\"articles\"}
magazine_article GET /magazines/:magazine_id/articles/:id(.:format) {:action=>\"show\",:controller=>\"articles\"}
PUT /magazines/:magazine_id/articles/:id(.:format) {:action=>\"update\",:controller=>\"articles\"}
DELETE /magazines/:magazine_id/articles/:id(.:format) {:action=>\"destroy\",:controller=>\"articles\"}
magazines GET /magazines(.:format) {:action=>\"index\",:controller=>\"magazines\"}
POST /magazines(.:format) {:action=>\"create\",:controller=>\"magazines\"}
new_magazine GET /magazines/new(.:format) {:action=>\"new\",:controller=>\"magazines\"}
edit_magazine GET /magazines/:id/edit(.:format) {:action=>\"edit\",:controller=>\"magazines\"}
magazine GET /magazines/:id(.:format) {:action=>\"show\",:controller=>\"magazines\"}
PUT /magazines/:id(.:format) {:action=>\"update\",:controller=>\"magazines\"}
DELETE /magazines/:id(.:format) {:action=>\"destroy\",:controller=>\"magazines\"}
我怎么解决这个问题?在这种情况下,传递给simple_form_for的正确参数是什么?
解决方法
嵌套资源后,必须确保始终在请求之间传递更高级别的资源。
您的路线将是使用耙路时注意到的路线。
该表格应如下所示:
<%= simple_form_for([@magazine,@article]) do |f| %>
<%= f.error_notification %>
<div class=\"inputs\">
<%= f.input :title %>
<%= f.input :author %>
</div>
<div class=\"actions\">
<%= f.button :submit %>
</div>
<% end %>
这样,您现在必须在文章控制器和文章查看页面(其中包括杂志本身)上的所有地方使用新路线。
您在控制器中的创建动作将是:
def create
@magazine = Magazine.find(params[:magazine_id])
@article = @magazine.articles.create(params[:article])
respond_to do |format|
if @article.save
format.html { redirect_to([@magazine,@article],:notice => \'Article was successfully created.\') }
format.xml { render :xml => @article,:status => :created,:location => @article }
else
format.html { render :action => \"new\" }
format.xml { render :xml => @article.errors,:status => :unprocessable_entity }
end
end
end
因此,现在您的所有路线也都应引用@magazine。
,在控制台中运行rake routes
,并确保存在articles_path
。
似乎应该命名为magazines_articles_path(...)
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