Question

请帮我弄清问题。我的问题场景是我有两个模型说用户和项目有很多关系。

现在我想创建一个新用户，并在创建用户时为用户分配一个或多个项目。项目名称将从users / _form.html.erb的下拉列表中选择，该列表将从Project填充模型。我想在projectsusers数据库表中创建这样的新用户时保存数据： project_id user_id 1 1 2 1 3 1

当我创建新用户时，我收到此错误“无法找到ID = 1的项目，ID =”的用户

代码

class User < ActiveRecord::Base
  attr_accessible :name, :projects_attributes
  has_many :project_users, :class_name => 'Projectuser'
  has_many :projects, through: :project_users
  accepts_nested_attributes_for :projects, :allow_destroy => true
end


class Project < ActiveRecord::Base
  attr_accessible :name
  has_many :project_users
  has_many :users, :through => :project_users

end


class Projectuser < ActiveRecord::Base
  attr_accessible :project_id, :user_id
  belongs_to :user
  belongs_to :project
end

 controller
   class UsersController < ApplicationController

#GET / users #GET /users.json def指数 @users = User.all

respond_to do |format|
  format.html # index.html.erb
  format.json { render json: @users }
end

端

＃GET / users / 1 #GET /users/1.json def show @user = User.find（params [：id]）

respond_to do |format|
  format.html # show.html.erb
  format.json { render json: @user }
end

端

＃GET / users / new #GET /users/new.json def new @user = User.new

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

端

＃GET / users / 1 /编辑 def编辑 @user = User.find（params [：id]）端

#POST / users #POST /users.json def创建 @user = User.new（params [：user]）

@user.project_users.build
respond_to do |format|
  if @user.save

    #@user.project_users.update_attributes(params[][:projects_attributes])
    format.html { redirect_to @user, notice: 'User was successfully created.' }
    format.json { render json: @user, status: :created, location: @user }
  else
    format.html { render action: "new" }
    format.json { render json: @user.errors, status: :unprocessable_entity }
  end
end

端

＃PUT / users / 1 ＃PUT /users/1.json def更新 @user = User.find（params [：id]）

respond_to do |format|
  if @user.update_attributes(params[:user])
    format.html { redirect_to @user, notice: 'User was successfully updated.' }
    format.json { head :no_content }
  else
    format.html { render action: "edit" }
    format.json { render json: @user.errors, status: :unprocessable_entity }
  end
end

端

#DELETE / users / 1 #DELETE /users/1.json def destroy @user = User.find（params [：id]） @ user.destroy

respond_to do |format|
  format.html { redirect_to users_url }
  format.json { head :no_content }
end

端端

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

      <ul>
      <% @user.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>
  <%= f.fields_for :projects do |task_form| %>
    <%= task_form.collection_select(:id, Project.all, :id, :name, :include_blank => true ) %>
    <%= task_form.link_to_remove "Remove this task" %>
  <% end %>
  <p><%= f.link_to_add "Add a task", :projects %></p>
  </div>
  <div class="actions">
  <%= f.submit %>
  </div>
<% end %>

错误日志：

在2013-10-02 16:10:25 +0600开始发布“/ users”for 127.0.0.1 UsersController处理#create as HTML 参数：{“utf8”=＆gt;“✓”，“authenticity_token”=＆gt;“nCsy6E1MuAoMK7hGwAcMNJFVvmq60Bz75lqLLECxb / U =”，“user”=＆gt; {“name”=＆gt;“talha”，“projects_attributes”=＆gt; { “1380708606908”=＆gt; {“id”=＆gt;“1”，“_ destroy”=＆gt;“false”}}}，“commit”=＆gt;“创建用户”} 项目加载（0.1ms）SELECT“projects”。* FROM“projects”INNER JOIN“projectusers”ON“projects”。“id”=“projectusers”。“project_id”WHERE“projectusers”。“user_id”IS NULL AND“projects “。”id“IN（1）已完成404在32毫秒内找不到

ActiveRecord :: RecordNotFound（对于ID =的用户，找不到ID = 1的项目）： app / controllers / users_controller.rb：43：new' app/controllers/users_controller.rb:43:in创建'

呈现/Users/maruf/.rvm/gems/ruby-1.9.3-p429/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/_trace.erb(1.1ms）呈现/Users/maruf/.rvm/gems/ruby-1.9.3-p429/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb(0.9ms）在救援/布局（7.1ms）内呈现/Users/maruf/.rvm/gems/ruby-1.9.3-p429/gems/actionpack-3.2.13/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb

先谢谢你们.........

Answer 1

我更改了用户模型中的accepts_nested_attributes_for：project_users 在我使用的形式task_form.collection_select（：project_id，Project.all，：id，：name，：multiple =＆gt; true）并且它摇滚...

与has_many的Rails组合框问题：通过关系

1 个答案: