ruby-on-rails-3 - 在 rails 中更新表单 - 没有路线匹配 [PUT]

Question

我有一个表格来创建广告。

Controller :

  def edit
    @engines = Engine.all
    @car = Car.find(params[:id])
  end

  def update
    @car = Car.find(params[:id])

    if @car.save
      redirect_to root_path
    end
  end

我的路线:

resources :adverts

创建.html.erb

<%= form_for @car, :url => adverts_path do |f| %>

  <div><%= f.label :name %><br />
  <%= f.text_field :name %></div>

  <%= hidden_field_tag :model_id, params[:model_id] %>

  <%= select_tag :engine_id, options_from_collection_for_select(@engines, "id", "name",:selected=>@car.engine_id) %>

  <div><%= f.submit "Create car!" %></div>
<% end %>

我可以创建广告，但我不能更新它。

编辑.html.erb

<%= form_for @car, :url => adverts_path do |f| %>

  <div><%= f.label :name %><br />
  <%= f.text_field :name %></div>

  <%= hidden_field_tag :model_id, params[:model_id] %>

  <%= select_tag :engine_id, options_from_collection_for_select(@engines, "id", "name",:selected=>@car.engine_id) %>

  <div><%= f.submit "Update car!" %></div>
<% end %>

当我提交表单时，出现错误 - 没有路由匹配 [PUT] "/adverts"

$ 耙路线:

                       adverts GET    /adverts(.:format)                     adverts#index
                               POST   /adverts(.:format)                     adverts#create
                    new_advert GET    /adverts/new(.:format)                 adverts#new
                   edit_advert GET    /adverts/:id/edit(.:format)            adverts#edit
                        advert GET    /adverts/:id(.:format)                 adverts#show
                               PUT    /adverts/:id(.:format)                 adverts#update
                               DELETE /adverts/:id(.:format)                 adverts#destroy

我需要帮助。

Answer 1

当您更新时，您必须通过传递 id 来让 Rails 知道您要更新哪个对象。 .

在 edit.html.erb改变:

<%= form_for @car, :url => adverts_path do |f| %>

到:

<%= form_for @car, :url => advert_path(@car) do |f| %>

顺便说一句，我发现你的代码很奇怪。为什么您的模型名称与您的 Controller 和路由不匹配？我的意思是您正在制作广告，但您的模型称为汽车。那没有任何意义。要么称其为汽车，要么称其为广告，但不要将它们混为一谈。