ruby-on-rails - Rails 没有路由错误，而 rake routes 给出了路由

Question

我正在处理 Rails 中的嵌套资源“农场”，我创建新农场的表单如下所示:

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

  <ul>
  <% @farm.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 :contact %><br />
  <%= f.text_field :contact %>
  </div>
  <div class="field">
  <%= f.label :adress %><br />
  <%= f.text_field :adress %>
  </div>
  <div class="actions">
  <%= f.submit %>
  </div>
  <% end %>

我在农场 Controller 中对应的"new"功能是:

 def new
  @farm = Farm.new
  @user = User.find(current_user)


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

它可以很好地呈现表单，但是在我单击提交之后，它实际上尝试创建新的农场，我收到此错误:

 No route matches [POST] "/users/2/farm/new"

在我的佣金 route ，我清楚地显示了这条路线:

     user_farm POST   /users/:user_id/farm(.:format) {:action=
    create", :controller=>"farms"}

我只是猜测问题出在我的创建函数中:

 def create
@farm = Farm.new(params[:farm])
@user = User.find(current_user)


respond_to do |format|
  if @farm.save
    format.html { redirect_to user_farm(@user, @farm), notice: 'Farm was successfully created.' }
    format.json { render json: @farm, status: :created, location: @farm }
  else
    format.html { render action: "new" }
    format.json { render json: @farm.errors, status: :unprocessable_entity }
  end
end
end    

我的 routes.rb 文件:

  resources :users do
  resource :farm
  end


  devise_for :users, :path => 'accounts'

我正在通过此链接访问我的新农场表格:

 <%= link_to "New Farm", new_user_farm_path(current_user) %>

我的全部佣金路线:

           user_farm POST   /users/:user_id/farm(.:format)       {:action=>"
           create", :controller=>"farms"}
           new_user_farm GET    /users/:user_id/farm/new(.:format)   {:action=>"
           new", :controller=>"farms"}
           edit_user_farm GET    /users/:user_id/farm/edit(.:format)  {:action=>"
           edit", :controller=>"farms"}
                     GET    /users/:user_id/farm(.:format)       {:action=>"
           show", :controller=>"farms"}
                     PUT    /users/:user_id/farm(.:format)       {:action=>"
           update", :controller=>"farms"}
                     DELETE /users/:user_id/farm(.:format)       {:action=>"
           destroy", :controller=>"farms"}
               users GET    /users(.:format)                     {:action=>"
           index", :controller=>"users"}
                     POST   /users(.:format)                     {:action=>"
           create", :controller=>"users"}
            new_user GET    /users/new(.:format)                 {:action=>"
           new", :controller=>"users"}
           edit_user GET    /users/:id/edit(.:format)            {:action=>"
           edit", :controller=>"users"}
                user GET    /users/:id(.:format)                 {:action=>"
           show", :controller=>"users"}
                     PUT    /users/:id(.:format)                 {:action=>"
           update", :controller=>"users"}
                     DELETE /users/:id(.:format)                 {:action=>"
           destroy", :controller=>"users"}
           new_user_session GET    /accounts/sign_in(.:format)          {:action=>"
           new", :controller=>"devise/sessions"}
           user_session POST   /accounts/sign_in(.:format)          {:action=>"
           create", :controller=>"devise/sessions"}
           destroy_user_session GET    /accounts/sign_out(.:format)         {:action=>"
           destroy", :controller=>"devise/sessions"}
           user_password POST   /accounts/password(.:format)         {:action=>"
           create", :controller=>"devise/passwords"}
           new_user_password GET    /accounts/password/new(.:format)     {:action=>"
           new", :controller=>"devise/passwords"}
           edit_user_password GET    /accounts/password/edit(.:format)    {:action=>"
           edit", :controller=>"devise/passwords"}
                     PUT    /accounts/password(.:format)         {:action=>"
           update", :controller=>"devise/passwords"}
           cancel_user_registration GET    /accounts/cancel(.:format)            {:action=>"
           cancel", :controller=>"devise/registrations"}
           user_registration POST   /accounts(.:format)                  {:action=>"
           create", :controller=>"devise/registrations"}
           new_user_registration GET    /accounts/sign_up(.:format)           {:action=>"
           new", :controller=>"devise/registrations"}
           edit_user_registration GET    /accounts/edit(.:format)             {:action=>"
           edit", :controller=>"devise/registrations"}
                     PUT    /accounts(.:format)                  {:action=>"
           update", :controller=>"devise/registrations"}
                     DELETE /accounts(.:format)                  {:action=>"
           destroy", :controller=>"devise/registrations"}
           user_confirmation POST   /accounts/confirmation(.:format)     {:action=>"
           create", :controller=>"devise/confirmations"}
           new_user_confirmation GET    /accounts/confirmation/new(.:format) {:action=>"
           new", :controller=>"devise/confirmations"}
                     GET    /accounts/confirmation(.:format)     {:action=>"
           show", :controller=>"devise/confirmations"}
           user_unlock POST   /accounts/unlock(.:format)           {:action=>"
           create", :controller=>"devise/unlocks"}
           new_user_unlock GET    /accounts/unlock/new(.:format)       {:action=>"
           new", :controller=>"devise/unlocks"}
                     GET    /accounts/unlock(.:format)           {:action=>"
           show", :controller=>"devise/unlocks"}
           home_index GET    /home/index(.:format)                {:controlle
           r=>"home", :action=>"index"}
                root        /                                    {:controlle
           r=>"home", :action=>"index"}

Answer 1

问题是您的表单正在尝试向仅存在于 GET 请求中的 URL 发出 POST 请求。所以它告诉你

[POST] "/users/2/farm/new"

不存在——它不存在。您的 rake routes 输出证实了这一点——最接近的是

new_user_farm GET    /users/:user_id/farm/new(.:format)

这是一个 GET 请求。

表单默认使用 POST 来创建新记录，因此您需要提供一个可以 POST 到的 url。或者您可以让 Rails 从对象的状态中找出它。所以要么

<%= form_for([@user, @farm], :url=> user_farm_path(@user)) do |f| %>

或

<%= form_for([@user, @farm]) do |f| %>

应该可以。在前一种情况下，我们使用的命名路由与 rake routes 输出中的 POST 路由相匹配。在后一种情况下，我们让 Rails 根据您的 @farm 对象的状态来计算它。也就是说，如果 @farm 是一个 new_record?，它将向 /users/:user_id/farm 提交一个 POST 请求，或者如果 @farm 是 persisted? 然后它会向 /users/:user_id/farm 提交一个 PUT 请求。 (相同的路径，只是不同的请求类型。)