Multi Role

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第一种方式：gem rolify
rolify

第二种方式：
1.在model中定义角色，批准方式等

user.rb
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enum role: { :user, :vip, :admin }
after_initialize :set_default_role, if: :new_record?
def set_default_role
    self.role ||= :user
end

def admin?
    self.role == 'admin'
    is_admin == true
end

def is_user?
    self.role = 'user'
end

def vip?
    self.role = 'vip'
    is_vip == true
end

def qunlified_vip?
    role == 'vip' && is_admin
end

def unqunlified_vip?
    role == 'vip' && !is_admin
end

def approve!
    self.is_admin = true
    save
end
end

2.在注册界面加上角色选择按钮

devise/registration/new.rb
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<%= f.radio_button(:role, "user") %>
<%= label(:role, "用户注册") %>&nbsp;&nbsp;&nbsp;&nbsp;
<%= f.radio_button(:role, "vip") %>
<%= label(:role, "商家注册") %>

3.在model中加上role，is_vip的栏位
rails g migration add_role_to_users

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def change
        add_column :users, :role, :string
    end

rails g migration add_is_vip_to_user

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def change
        add_column :users, :is_vip, :boolean, default: false
    end

4.新建一个controller定义index，批准，取消等方法

controller/admin/users_controller.rb
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    class Admin::UsersController < ApplicationController
    before_action :authenticate_user!
    before_action :require_is_admin
    layout 'admin'
    def index
        @users = User.where(role:'vip').order('is_vip ASC')
    end
    def approve_vip
        @user = User.find(params[:user_id])
        @user.approve!
        redirect_to :back
    end

    def cancel_vip
        @user = User.find(params[:user_id])
        @user.cancel!
        redirect_to :back
    end
end

5.在route中添加路径

config/routes.rb
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namespace :admin do
        resources :users do
            post :approve_vip
            post :cancel_vip
        end
end

6.建立view页面，显示需要的界面

views/admin/user/index.html.erb
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<div class="container body well">
  <h3 class="text-center">会员管理</h3>
  <br>
  <br>
  <table class="table table-responsive">
    <thead>
      <tr>
        <th>用户id</th>
        <th>用户邮箱</th>
        <th>用户角色</th>
        <th>状态</th>
        <th>审批</th>
      </tr>
    </thead>
    <tbody>
      <% @users.each do |user| %>
      <tr>
        <td><%= user.id %></td>
        <td><%= user.email %></td>
        <td><%= user.role %></td>
        <td>
          <% if user.qunlified_vip? %>
          已通过审核
          <% else %>
          未通过审核
          <% end %>
        </td>
        <td>
          <% if user.unqunlified_vip? %>
          <%= link_to("批准成为会员", admin_user_approve_vip_path(user),:method => :post)%>
          <% else %>
          <%= link_to("取消会员身份", admin_user_cancel_vip_path(user),:method => :post)%>
          <% end %>
       </td>
      </tr>
      <% end %>
    </tbody>
  </table>
</div>

PS: 同一页面两个表格中显示两个不同的role