Rails 4 + Rolify Gem：用户角色没有通过UI更新

Question

我有一个编辑视图，允许我更新特定用户的角色。我已经包含了下面的代码，但是，只是为了给你一个想法，当我取消选中页面上的框时，我的控制器中的put语句正确地发现角色关联是错误的，可以进一步查看日志。

但是，稍后在日志中，您可以看到角色正在重新关联回“真实”＆＃39;而且我不确定为什么会出现这种情况！

如果未选中复选框，我希望从用户中删除这些角色。

用户/ edit.html.erb：

 <fieldset>
   <%= form_for @user, :url => {action: "update"}, :html => { :class => 'user-role' } do |f| %>

     <h1 class="h1-heading">User Roles</h1>
     <p class="user-paragraph"> Check the boxes to grant different roles to <%= @user.first_name %> <%= @user.last_name %>:</p>
       <%= f.label(:admin) do %>
         <%= hidden_field_tag(:admin, 0) %>
         <%= check_box_tag(:admin, 1, @user.has_role?(:admin)) %>
         Administrator
       <% end %>

       <%= f.label(:member) do %>
         <%= hidden_field_tag(:member, 0) %>
         <%= check_box_tag(:member, 1, @user.has_role?(:member)) %>
         Member
       <% end %>
     <%= f.submit class: 'btn btn-primary-dialog pull-right' %>  
   <% end %>
 </fieldset>

users_controller.rb：

def update
    @user = User.find(params[:id])
    @customer = current_user.customer
    @logged_in_user = User.find_by_email(current_user.email)

    if params[:admin] == "1"
      @user.grant(:admin)
    elsif params[:admin] == "0"
      @user.remove_role(:admin)
    end

    if params[:member] == "1"
      @user.grant(:member)
    elsif params[:member] == "0"
      @user.remove_role(:member)
    end

    puts "NEW ROLES"
    puts @user.has_role? :member
    puts @user.has_role? :admin

    if @user.update_attributes(params[:user])
      puts "UPDATING USER"
      puts @user.has_role? :member
      puts @user.has_role? :admin
      redirect_to '/users/show', :flash => { :alert => 'User was successfully updated.' }          
      end
    end
  end

日志：

正如您在下面看到的那样，它会返回＆＃39; false＆＃39;然后在更新属性时，再次将角色设置为＆＃39; true＆＃39;而我无法弄清楚发生在哪里或为何会发生这种情况！

Started PATCH "/users/51" for 127.0.0.1 at 2015-06-26 13:48:58 +1000
Processing by UsersController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"+qNti57HxMa2B/a+c6nS71Qp0p7hf+kTE4b5eiBI4No=", "admin"=>"0", "member"=>"0", "commit"=>"Update User", "id"=>"51"}
  User Load (0.5ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 ORDER BY `users`.`id` ASC LIMIT 1
  Customer Load (0.3ms)  SELECT `customers`.* FROM `customers` WHERE `customers`.`email` = 'ryan@ryandrake.com' LIMIT 1
  Company Load (0.2ms)  SELECT `companies`.* FROM `companies` WHERE `companies`.`domain` = 'ryandrake.com' LIMIT 1
  CustomerAccess Load (0.3ms)  SELECT `customer_accesses`.* FROM `customer_accesses` WHERE `customer_accesses`.`customer_id` = 1 LIMIT 1
  User Load (0.3ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 51 LIMIT 1
  CACHE (0.0ms)  SELECT `customers`.* FROM `customers` WHERE `customers`.`email` = 'ryan@ryandrake.com' LIMIT 1
  User Load (0.2ms)  SELECT `users`.* FROM `users` WHERE `users`.`email` = 'ryan@ryandrake.com' LIMIT 1
  Role Load (0.3ms)  SELECT `roles`.* FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 51 AND `roles`.`name` = 'admin'
   (0.1ms)  BEGIN
   (0.2ms)  DELETE FROM `users_roles` WHERE `users_roles`.`user_id` = 51 AND `users_roles`.`role_id` IN (9)
   (0.9ms)  COMMIT
   (0.3ms)  SELECT COUNT(count_column) FROM (SELECT 1 AS count_column FROM `users` INNER JOIN `users_roles` ON `users`.`id` = `users_roles`.`user_id` WHERE `users_roles`.`role_id` = 9 LIMIT 1) subquery_for_count
  Role Load (0.3ms)  SELECT `roles`.* FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 51 AND `roles`.`name` = 'member'
   (0.1ms)  BEGIN
   (0.2ms)  DELETE FROM `users_roles` WHERE `users_roles`.`user_id` = 51 AND `users_roles`.`role_id` IN (3)
   (0.4ms)  COMMIT
   (0.5ms)  SELECT COUNT(count_column) FROM (SELECT 1 AS count_column FROM `users` INNER JOIN `users_roles` ON `users`.`id` = `users_roles`.`user_id` WHERE `users_roles`.`role_id` = 3 LIMIT 1) subquery_for_count
NEW ROLES
  Role Load (0.7ms)  SELECT `roles`.* FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 51 AND (((roles.name = 'member') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)))
false
  Role Load (0.6ms)  SELECT `roles`.* FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 51 AND (((roles.name = 'admin') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)))
false
   (0.3ms)  BEGIN
  Customer Load (0.3ms)  SELECT `customers`.* FROM `customers` WHERE `customers`.`email` = 'ryan.drake2@otherlevels.com' LIMIT 1
  ExtraCustomerAccount Load (0.6ms)  SELECT `extra_customer_accounts`.* FROM `extra_customer_accounts` WHERE `extra_customer_accounts`.`email` = 'ryan.drake2@otherlevels.com' LIMIT 1
  Customer Load (0.3ms)  SELECT `customers`.* FROM `customers` WHERE `customers`.`id` = 1 LIMIT 1
  Company Load (0.2ms)  SELECT `companies`.* FROM `companies` WHERE `companies`.`domain` = 'otherlevels.com' LIMIT 1
  Company Load (0.2ms)  SELECT `companies`.* FROM `companies` WHERE `companies`.`name` = 'None' ORDER BY `companies`.`id` ASC LIMIT 1
  Role Load (0.3ms)  SELECT `roles`.* FROM `roles` WHERE `roles`.`name` = 'member' AND `roles`.`resource_type` IS NULL AND `roles`.`resource_id` IS NULL ORDER BY `roles`.`id` ASC LIMIT 1
  Role Exists (0.2ms)  SELECT 1 AS one FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 51 AND `roles`.`id` = 3 LIMIT 1
   (0.2ms)  SELECT `roles`.id FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 51
  Role Load (0.2ms)  SELECT `roles`.* FROM `roles` WHERE `roles`.`id` = 3 LIMIT 1
  Role Load (0.3ms)  SELECT `roles`.* FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 51
   (0.2ms)  INSERT INTO `users_roles` (`user_id`, `role_id`) VALUES (51, 3)
  Role Load (0.6ms)  SELECT `roles`.* FROM `roles` WHERE `roles`.`name` = 'admin' AND `roles`.`resource_type` IS NULL AND `roles`.`resource_id` IS NULL ORDER BY `roles`.`id` ASC LIMIT 1
  Role Load (0.3ms)  SELECT `roles`.* FROM `roles` WHERE `roles`.`id` IN (3, 9)
   (0.2ms)  INSERT INTO `users_roles` (`user_id`, `role_id`) VALUES (51, 9)
   (0.3ms)  COMMIT
UPDATING USER
  Role Load (0.4ms)  SELECT `roles`.* FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 51 AND (((roles.name = 'member') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)))
true
  Role Load (0.3ms)  SELECT `roles`.* FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 51 AND (((roles.name = 'admin') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)))
true
  Role Load (0.3ms)  SELECT `roles`.* FROM `roles` INNER JOIN `users_roles` ON `roles`.`id` = `users_roles`.`role_id` WHERE `users_roles`.`user_id` = 1 AND (((roles.name = 'otherlevels_admin') AND (roles.resource_type IS NULL) AND (roles.resource_id IS NULL)))
Redirected to http://localhost:3000/users/show
Completed 302 Found in 80ms (ActiveRecord: 15.1ms)

在指出它没有正确更新params的地方时，会有任何帮助！

Answer 1

你的主要问题在于：

@user.update_attributes(params[:user_id])

编辑 - 我原来的解决方案根本不起作用。

与我原来的解决方案不同，这不需要简单的形式。

首先让我们设置表单：

<%= form_for(@user, url: {action: "update"}, html: { class: 'user-role' }) do |f| %>
  <h1 class="h1-heading">User Roles</h1>
  <p class="user-paragraph"> Check the boxes to grant different roles to <%= @user.first_name %> <%= @user.last_name %>:</p>
  <%= f.fields_for(:roles) do |r| %>
    <%= r.hidden_field :name unless r.object.persisted? %>
    <%= r.label :_keep do %>
      <%= r.check_box :_keep, checked: r.object.persisted? %>
      <%= r.object.name %>
    <% end %>
  <% end %>
<% end %>

我们将为角色传递一些嵌套属性：

• name（适用于新角色）
• _keep虚拟属性 - 我们是否保存角色
• id（如果角色存在，则由rails自动插入）

然后我们将用户类修改为accepts_nested_attributes_for :roles

class User < ActiveRecord::Base
  rolify
  accepts_nested_attributes_for :roles,
    allow_destroy: true,
    reject_if: ->(hash){ hash["_keep"] != "1" }
end

注意reject_if: ->(hash){ hash["_keep"] != "1" }这意味着如果取消选中该复选框，我们就不会创建角色，而如果我们通过_delete=true则会删除将删除该角色的allow_destroy。

我们需要将_keep虚拟属性添加到R​​ole：

class Role < ActiveRecord::Base
  has_and_belongs_to_many :users, :join_table => :users_roles
  belongs_to :resource, :polymorphic => true
  validates :resource_type,
            :inclusion => { :in => Rolify.resource_types },
            :allow_nil => true
  scopify
  attr_accessor :_keep
  AVAILABLE_ROLES = %w{ administrator member }
end

我们还添加了一个AVAILABLE_ROLES常量，以便我们可以获得角色列表。

class UsersController < ApplicationController
  before_action :set_user, only: [:show, :edit, :update, :destroy]

  # ...

  # GET /users/1/edit
  def edit
    # Seed checkboxes for roles
    Role::AVAILABLE_ROLES.each do |role|
      # This adds an unsaved role to the user if it does not exist
      @user.roles.build(name: role) unless @user.has_role?(role)
    end
  end

  # PATCH/PUT /users/1
  def update
    if @user.update(update_params)
      redirect_to @user, notice: 'User was successfully updated.'
    else
      render :edit
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_user
      @user = User.find(params[:id])
    end

    # Only allow a trusted parameter "white list" through.
    def user_params
      params.require(:user).permit(:username, :email, roles_attributes: [:name, :id, :_keep, :_destroy])
    end

    def update_params
      user_params.tap do |o|
        # Adds the _delete attribute if the keep checkbox is unchecked
        o[:roles_attributes] = o[:roles_attributes].map do |k,h|
           attrs = h.merge(_destroy: (h[:_keep] != "1"))
           # Don't let the user update the name of an existing Role!
           # This would let a malicious user to grant any role.
           h.key?(:id) ? attrs.except(:name) : attrs 
        end
      end
    end
end