1

此代码全部基于 Michael Hartl 的 Ruby on Rails 教程。我在我的 with创建了一个assigned动作users_controller

def assign
  puts "in assign..."
  @scout = User.find(params[:follower_id])
  @der   = User.find(params[:followed_id])
end

我意识到这目前没有做任何事情，但在_follow部分情况下，我有

<%= form_for @user, url: { action: "assign" } do |f| %>
  <div><%= hidden_field_tag :follower_id, @user.id %></div>
  <%= f.label :followed_id, "Assign #{@user.name} to" %>
  <%= f.collection_select :following, @ders, :id, :name, prompt: true %>
  <%= f.submit "Assign", class: "btn btn-primary" %>
<% end %>

但我得到了错误No route matches {:action=>"assign", :controller=>"users", :id=>"4"}。我是 Rails 新手，所以这可能只是一个愚蠢的问题。我究竟做错了什么？我需要修改我的routes.rb文件吗？另外，如果我尝试过<%= form_for @user do |f| %>，控制器如何知道要使用哪个操作？它是基于显示表单的操作吗？

编辑：我的routes.rb文件是

Rails.application.routes.draw do
  root                'static_pages#home'
  get    'help'    => 'static_pages#help'
  get    'about'   => 'static_pages#about'
  get    'contact' => 'static_pages#contact'
  get    'signup'  => 'users#new'
  get    'login'   => 'sessions#new'
  post   'login'   => 'sessions#create'
  delete 'logout'  => 'sessions#destroy'
  resources :users do
    member do
      get :following, :followers
    end
  end
  resources :account_activations, only: [:edit]
  resources :password_resets,     only: [:new, :create, :edit, :update]
  resources :relationships,       only: [:create, :destroy]
end

编辑 2：@Richform_for块生成的 HTML 是

<form class="edit_user" id="edit_user_5" action="/users/5/assign" accept-charset="UTF-8" method="post">
  <input name="utf8" type="hidden" value="✓">
  <input type="hidden" name="_method" value="patch">
  <input type="hidden" name="authenticity_token" value="...">
  <label for="user_followed_id">Assign Mr. Marley Muller to</label>
  <select name="user[following]" id="user_following">
    <option value="1">Example User</option>
    <option value="2">Matthew Swartz</option>
    <option value="3">Joseph Swartz</option>
  </select>
  <input type="submit" name="commit" value="Assign" class="btn btn-primary">
</form>

这是有道理的，为什么我目前收到一个找不到 id 错误，因为它没有发送真实的 id ( edit_user_5)

编辑 3：这是为请求传递的参数

Started PATCH "/users/6/assign" for 68.100.59.128 at 2015-12-15 03:54:39 +0000
Processing by UsersController#assign as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"...", "user"=>{"following"=>"2"}, "commit"=>"Assign", "id"=>"6"}
  User Load (0.5ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 6]]
Unpermitted parameter: following
  User Load (0.5ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", nil]]
Completed 404 Not Found in 9ms (ActiveRecord: 1.0ms)

ActiveRecord::RecordNotFound (Couldn't find User with 'id'=):
  app/controllers/users_controller.rb:69:in `assign'

编辑 4：使用以下路由文件，

Rails.application.routes.draw do
  root                'static_pages#home'
  get    'help'    => 'static_pages#help'
  get    'about'   => 'static_pages#about'
  get    'contact' => 'static_pages#contact'
  get    'signup'  => 'users#new'
  get    'login'   => 'sessions#new'
  post   'login'   => 'sessions#create'
  delete 'logout'  => 'sessions#destroy'
  resources :users do
    member do
      get :following, :followers
      match :assign, to: :assign, via: [:post, :patch]
    end
  end
  resources :account_activations, only: [:edit]
  resources :password_resets,     only: [:new, :create, :edit, :update]
  resources :relationships,       only: [:create, :destroy]
end

以及以下用于分配一个用户关注另一个用户的表格，

<%= form_for @user, url: { action: "assign" } do |f| %>
  <%= f.label :follower_id, "Assign #{@user.name} to" %>
  <%= f.collection_select :following, @ders, :id, :name, prompt: true %>
  <%= f.submit "Assign", class: "btn btn-primary" %>
<% end %>

我收到ActiveRecord::RecordNotFound in UsersController#assign错误Couldn't find User with 'id'=，但使用以下参数：

{"utf8"=>"✓",
 "_method"=>"patch",
 "authenticity_token"=>"...",
 "user"=>{"following"=>"3"},
 "commit"=>"Assign",
 "id"=>"4"}

ID 是正确的："user"=>{"following"=>"3"}而且"id"=>"4"，我相信我只是试图错误地访问它们。这是用户控制器中的分配操作：

def assign
  @scout = User.find(params[:id])
  @der = User.find(params_hash[:followed_id])
  # make scout follow der here
  redirect_to @scout
end

想法？

4

3 回答 3

7

在您的routes.rb文件中，您必须为特定的控制器操作定义路由，如下所示：

resource :users do 
  member do
    post 'assign' # change the request method to 'put'
  end
end

然后它将在控制器中为您的分配方法生成一个路由，例如：users/4/assign

欲了解更多信息，请访问指南

于 2015-12-12T04:09:58.167 回答
2

要添加到Emu的答案，您的代码将无法使用...

def assign
  puts "in assign..."
  @scout = User.find(params[:follower_id])
  @der   = User.find(params[:followed_id])
end

您从form_for对象中获得的参数将被构造为：

params[:user][:follower_id]
params[:user][:followed_id]

您必须使用以下内容：

#app/controllers/users_controller.rb
class UsersController < ApplicationController
   def assign
      @scout = User.find params[:id]
      @der = User.find params_hash[:followed_id]
   end

   private

   def params_hash
      params.require(:user).permit(:followed_id)
   end
end

hidden如果您使用相同的@user对象来填充它，您也可以删除表单中的字段：

<%= form_for @user, url: { action: "assign" } do |f| %>
  <%= f.label :followed_id, "Assign #{@user.name} to" %>
  <%= f.collection_select :following, @ders, :id, :name, prompt: true %>
  <%= f.submit "Assign", class: "btn btn-primary" %>
<% end %>

更新

您需要:assign在路线中包含：

Rails.application.routes.draw do
  root                'static_pages#home'
  resources :static_pages, only: [], path: "" do
     collection do
        get :help, :about, :contact
     end
  end

  resources :sessions, only: [:new, :create, :destroy], path_names: {new: "login", create: "login", destroy: "logout"}

  resources :users, path_names: { new: "signup" } do
    member do
      get :following, :followers, :assign
    end
  end
  resources :account_activations, only: [:edit]
  resources :password_resets,     only: [:new, :create, :edit, :update]
  resources :relationships,       only: [:create, :destroy]
end
于 2015-12-12T10:45:50.900 回答
0

事实证明，这是 Emu 和 Rich 的答案的结合。HTML中的表单是

<%= form_for @user, url: { action: "assign" } do |f| %>
  <%= f.label :follower_id, "Assign #{@user.name} to" %>
  <%= f.collection_select :following, @ders, :id, :name, prompt: true %>
  <%= f.submit "Assign", class: "btn btn-primary" %>
<% end %>

带控制器动作

def assign
  @scout = User.find(params[:id])
  @der = User.find(params[:user][:following])
  @scout.follow(@der)
  redirect_to @scout
end

和路线为

Rails.application.routes.draw do
  root                'static_pages#home'
  get    'help'    => 'static_pages#help'
  get    'about'   => 'static_pages#about'
  get    'contact' => 'static_pages#contact'
  get    'signup'  => 'users#new'
  get    'login'   => 'sessions#new'
  post   'login'   => 'sessions#create'
  delete 'logout'  => 'sessions#destroy'
  resources :users do
    member do
      get :following, :followers
      match :assign, to: :assign, via: [:post, :patch]
    end
  end
  resources :account_activations, only: [:edit]
  resources :password_resets,     only: [:new, :create, :edit, :update]
  resources :relationships,       only: [:create, :destroy]
end
于 2015-12-22T14:54:54.270 回答