如何在 Rails 3 中访问具有特定角色的用户? [英] How do I access a user with a specific role in Rails 3?

问题描述

我为用户提供了三种模型.用户、角色和任务.这是模型的外观:

 assignment.rb# == 架构信息# 架构版本:20101117094659## 表名:作业## id :整数不为空，主键# created_at :datetime# 更新时间:日期时间# user_id :整数# role_id :整数#班级分配:作业结尾用户名# == 架构信息# 架构版本:20110102225945## 表名:users## id :整数主键# 电子邮件:字符串(255)#encrypted_pa​​ssword :string(128)# password_salt :string(255)# reset_password_token :string(255)# remember_token :string(255)# remember_created_at :datetime# sign_in_count :整数# current_sign_in_at :datetime# last_sign_in_at :datetime# current_sign_in_ip :string(255)# last_sign_in_ip :string(255)# created_at :datetime# 更新时间:日期时间# 用户名:字符串(255)# f_name :string(255)# l_name :string(255)#类用户:作业def role_symbols角色.map做|角色|role.name.underscore.to_sym结尾结尾结尾

在我看来，要为当前用户选择项目，我这样做:

在我的项目控制器中，我有:

def 索引@projects = current_user.projectsresponse_to do |格式|format.html # index.html.erbformat.xml { 渲染:xml =>@项目}结尾

结束

然后在视图中我这样做:

<% if current_user.projects.exists?％＞<div class="数据">有 <%= current_user.projects.count %><br/><表格><% current_user.projects.each do |project|％＞<td><%= link_to project.name, project %></td></tr><%结束%>

<%其他%><div class="no-data"><%= image_tag('create-project-icon.png') %><br/>创建项目

<%结束%>

用户有 4 个角色:设计师、客户、管理员、超级用户.

每个设计师可以有多个客户.每个客户也可以属于多个设计师.

所以我想我有两个问题:

1. 如果当前登录的用户(设计师)想要添加一个客户(他们只能添加客户，不能添加其他用户类型)，我该怎么做?根据上面的代码示例，我将使用什么语法.添加客户后，我希望将他与项目、阶段、上传和评论相关联.因此，理论上，一名设计师将拥有多个项目，这些项目将属于多个客户.
2. 然后我如何只为已登录的设计者检索客户端.即，我如何选择具有与 current_user 关联的角色客户端的所有用户?

谢谢.

解决方案

问题是...鉴于已经添加了用户(客户端)到另一个用户(设计师)拥有的项目，我如何检索那些用户

这很简单:

# 给定一个项目 @project = Project.find(id)@clients = @project.users.joins(:roles).where("roles.name = 'client'")

I have three models for users. User, role & assignments. This is how the models look:

    assignment.rb

# == Schema Information
# Schema version: 20101117094659
#
# Table name: assignments
#
#  id         :integer         not null, primary key
#  created_at :datetime
#  updated_at :datetime
#  user_id    :integer
#  role_id    :integer
#

class Assignment < ActiveRecord::Base
    belongs_to :role
    belongs_to :user
end

role.rb

# == Schema Information
# Schema version: 20101117094659
#
# Table name: roles
#
#  id         :integer         not null, primary key
#  name       :string(255)
#  created_at :datetime
#  updated_at :datetime
#

class Role < ActiveRecord::Base
    has_many :assignments
    has_many :users, :through => :assignments
end

user.rb

# == Schema Information
# Schema version: 20110102225945
#
# Table name: users
#
#  id                   :integer         primary key
#  email                :string(255)
#  encrypted_password   :string(128)
#  password_salt        :string(255)
#  reset_password_token :string(255)
#  remember_token       :string(255)
#  remember_created_at  :datetime
#  sign_in_count        :integer
#  current_sign_in_at   :datetime
#  last_sign_in_at      :datetime
#  current_sign_in_ip   :string(255)
#  last_sign_in_ip      :string(255)
#  created_at           :datetime
#  updated_at           :datetime
#  username             :string(255)
#  f_name               :string(255)
#  l_name               :string(255)
#

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :token_authenticatable, :confirmable, and :lockable
  devise :database_authenticatable, :registerable, :timeoutable,
         :recoverable, :rememberable, :trackable, :validatable

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :password, :password_confirmation, :remember_me

  has_and_belongs_to_many :projects
  has_many :stages
  has_many :uploads
  has_many :comments
  has_many :assignments
  has_many :roles, :through => :assignments

  def role_symbols
    roles.map do |role|
      role.name.underscore.to_sym
    end
  end  
end

In my view, to select the projects for the current user, I do this:

In my projects controller, I have:

def index
@projects = current_user.projects

respond_to do |format|
  format.html # index.html.erb
  format.xml  { render :xml => @projects }
end

end

Then in the view I do this:

<% if current_user.projects.exists? %>
                    <div class="data">
                        There are <%= current_user.projects.count %> projects.<br />
                        <table>
                            <% current_user.projects.each do |project| %>
                                <tr class="changer">
                                    <td><%= link_to project.name, project %></td>
                                </tr>
                            <% end %>
                        </table>
                    </div>
                <% else %>
                    <div class="no-data">
                        <%= image_tag('create-project-icon.png') %><br />
                        Create Project
                    </div>      
                <% end %>

The users have 4 roles: Designer, Client, Admin, Superuser.

Each designer can have multiple clients. Each client can also belong to multiple designers.

So I guess I have two questions:

1. If the currently logged in user (a designer) wants to add a client (they can only add clients, no other user type), how do I do that? What's the syntax I will use according to my code samples above. Once I add a client, I will want to associate him to projects, stages, uploads and comments. So in theory, 1 designer will have multiple projects which will belong to multiple clients.
2. How do I then retrieve the clients only, for the designer logged in. i.e. how do I select all the users with role client associated with the current_user ?

Thanks.

解决方案

The question was...given that users (clients) have already been added to a project owned by another user (a designer), how do I retrieve those users

That is pretty straight forward :

# Given a project @project = Project.find(id)
@clients = @project.users.joins(:roles).where("roles.name = 'client'")

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