Question

这个让我发疯。我的项目中有两个模型之间的嵌套关系，我决定不希望它变浅，因为子对象（年）在父项的上下文之外没有任何意义（节）。

因此，无论我在何处找到对它的引用，我都会将关系淡化，但我发现自己无法访问该页面来创建新的子对象。

以下是我理解的网址：/festivals/1/years/new

来自routes.rb的

：

resources :festivals do
   resources :years
end

来自years_controller.rb：

# GET festivals/1/years/new
# GET festivals/1/years/new.json
def new
  @festival = Festival.find(params[:festival_id])
  @year = @festival.years.build

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

用户按下按钮进入新页面（在父对象的“显示”页面上）：

<%= link_to 'Add Year', new_festival_year_path(@festival), :class => 'btn' %>

这会将用户带到正确的网址，但我得到：

No route matches {:action=>"show", :controller=>"years", :festival_id=>#<Festival id: 7, name: "Improganza", founded: nil, logo: "", mission: "This is that one that people spend a lot of money t...", city: "Honolulu", state_code: "HI", country_code: "US", created_at: "2013-07-26 14:49:19", updated_at: "2013-07-26 14:49:19">}

我创建了一个新的Rails项目并使用Akria Matsuda的nested_scaffold gem设置了脚手架，只是为了将该输出与我的代码进行比较......结果文件看起来像我在这里所示。我不知道自己可能缺少什么。

只是为了衡量，我rake routes的输出：

            festival_years GET        /festivals/:festival_id/years(.:format)          years#index
                           POST       /festivals/:festival_id/years(.:format)          years#create
         new_festival_year GET        /festivals/:festival_id/years/new(.:format)      years#new
        edit_festival_year GET        /festivals/:festival_id/years/:id/edit(.:format) years#edit
             festival_year GET        /festivals/:festival_id/years/:id(.:format)      years#show
                           PUT        /festivals/:festival_id/years/:id(.:format)      years#update
                           DELETE     /festivals/:festival_id/years/:id(.:format)      years#destroy
                 festivals GET        /festivals(.:format)                             festivals#index
                           POST       /festivals(.:format)                             festivals#create
              new_festival GET        /festivals/new(.:format)                         festivals#new
             edit_festival GET        /festivals/:id/edit(.:format)                    festivals#edit
                  festival GET        /festivals/:id(.:format)                         festivals#show
                           PUT        /festivals/:id(.:format)                         festivals#update
                           DELETE     /festivals/:id(.:format)                         festivals#destroy
                           GET        /festivals(.:format)                             festivals#index
                           POST       /festivals(.:format)                             festivals#create
                           GET        /festivals/new(.:format)                         festivals#new
                           GET        /festivals/:id/edit(.:format)                    festivals#edit
                           GET        /festivals/:id(.:format)                         festivals#show
                           PUT        /festivals/:id(.:format)                         festivals#update
                           DELETE     /festivals/:id(.:format)                         festivals#destroy

Answer 1

试试这个：

<%= link_to 'Add Year', new_festival_year_path(@festival.id, :class => 'btn' %>

或

<%= link_to 'Add Year', new_festival_year_path({festival_id: @festival.id}, :class => 'btn' %>

根据你得到的错误

:festival_id=>#<Festival id: 7, name: "Improganza", founded: nil, logo: "", mission: "This is that one that people spend a lot of money t...", city: "Honolulu", state_code: "HI", country_code: "US", created_at: "2013-07-26 14:49:19", updated_at: "2013-07-26 14:49:19">}

路由器将整个节日参数作为:festival_id

的输入

Answer 2

我认为您正在将years_controller中的#new和#year操作合并在一起，这可能会导致一些问题。

# GET festivals/1/years/new
# GET festivals/1/years/new.json
def new
  @festival = Festival.find(params[:festival_id])
  @year = @festival.years.build
end

def create
  @festival = Festival.find(params[:festival_id])
  @year = @festival.years.create(...)
  #...fill in the rest of the method...
end

您还应该更新您的链接：

<%= link_to 'Add Year', new_festival_year_path(festival_id: @festival), :class => 'btn' %>

我创建了一个可能有用的short quiz on nested resources。

Answer 3

答案很愚蠢。在我的Rails服务器日志中（我需要训练自己以引起更多关注），我看到一些行表示我的_form.html.erb部分第63行出现问题。

该行是：

<%= link_to t('.cancel', :default => t("helpers.links.cancel")),
   festival_year_path(@festival), :class => 'btn' %>

糟糕。为什么我决定将“取消”按钮带到年（当然，这不会存在）超出我的范围。我将其更改为festival_path(@festival)并且一切都很好。

谢谢大家，感谢您的帮助。我是StackOverflow和Rails的新手。我真的很高兴能得到如此快速的反应！

在嵌套路由中创建新子项

3 个答案: