ruby-on-rails - Rails 5 - Rolify - 试图从用户中删除角色实例

Question

我正在尝试学习如何在我的 Rails 5 应用程序中使用 rolify。

我之前问过很多关于 Rolify 的问题，最近一次是 here但我找不到帮助。

我正在努力尝试弄清楚如何从用户中删除分配的角色。

我的模式中的表有 app_roles 表(这是我的 CRUD，用于制作可以单独分配给用户的角色)、用户、角色和 user_roles - 如:

create_table "app_roles", force: :cascade do |t|
    t.string   "title"
    t.string   "display_name"
    t.integer  "category"
    t.datetime "created_at",   null: false
    t.datetime "updated_at",   null: false
  end

  create_table "users", force: :cascade do |t|
    t.string   "first_name"
    t.string   "last_name"
    t.string   "email",                  default: "", null: false
    t.string   "encrypted_password",     default: "", null: false
    t.string   "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.integer  "sign_in_count",          default: 0,  null: false
    t.datetime "current_sign_in_at"
    t.datetime "last_sign_in_at"
    t.inet     "current_sign_in_ip"
    t.inet     "last_sign_in_ip"
    t.string   "confirmation_token"
    t.datetime "confirmed_at"
    t.datetime "confirmation_sent_at"
    t.string   "unconfirmed_email"
    t.integer  "failed_attempts",        default: 0,  null: false
    t.string   "unlock_token"
    t.datetime "locked_at"
    t.datetime "created_at",                          null: false
    t.datetime "updated_at",                          null: false
    t.integer  "organisation_id"
    t.index ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true, using: :btree
    t.index ["email"], name: "index_users_on_email", unique: true, using: :btree
    t.index ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true, using: :btree
    t.index ["unlock_token"], name: "index_users_on_unlock_token", unique: true, using: :btree
  end

  create_table "users_roles", id: false, force: :cascade do |t|
    t.integer "user_id"
    t.integer "role_id"
    t.index ["user_id", "role_id"], name: "index_users_roles_on_user_id_and_role_id", using: :btree
  end

create_table "roles", force: :cascade do |t|
    t.string   "name"
    t.string   "resource_type"
    t.integer  "resource_id"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.index ["name", "resource_type", "resource_id"], name: "index_roles_on_name_and_resource_type_and_resource_id", using: :btree
    t.index ["name"], name: "index_roles_on_name", using: :btree
  end

关联是:

用户

rolify strict: true # strict means you get true only on a role that you manually add
  attr_accessor :current_role

作用

has_and_belongs_to_many :users, :join_table => :users_roles

  belongs_to :resource,
             :polymorphic => true,
             :optional => true

应用程序角色(没有关联 - 这是我用来通过表单创建新角色的 CRUD)

我的用户模型有:

class User < ApplicationRecord
  rolify strict: true # strict means you get true only on a role that you manually add
  attr_accessor :current_role

我不知道如何使用 rolify 来分配角色，就像它在 wiki 中显示的那样。这就是为什么我制作了一个单独的资源。这称为分配角色。我有一个 assign_roles_controller.rb，它有:

class Users::AssignRolesController < ApplicationController

  before_action :authenticate_user!

  def index
      @app_roles = AppRole.all
  end


  def create
    user = User.find(params[:users])
    role = AppRole.find(params[:roles])
    organisation = Organisation.find(current_user.organisation)
     # byebug

    user.add_role role.display_name, organisation

    flash[:notice] = "Successfully created"
    redirect_to action: :index
  end

  def show
    @users = User.all
  end

  def update
  end

  def destroy

    # user = User.find(params[:users])
    # user = User.find(params[:id])
    user = User.find_by_id(params[:id])
    # User.find(params[:id])
    # role = AppRole.find(params[:roles])
    role = params[:user][:roles]
    # assigned_role = user.roles
    # user_roles = user.roles
    # organisation = Organisation.first
    organisation = Organisation.find(current_user.organisation)

    # byebug

    user.remove_role role.display_name, organisation

    flash[:notice] = "Successfully created"
    redirect_to root_path
  end

end

路由是嵌套的，所以我有:

resources :users, shallow: true do
    scope module: :users do
      resources :assign_roles

在我的用户索引中，我试图显示一个用户列表，其中包含他们的每个角色和一个删除角色链接。在 users/index.html.erb 中，我有:

<% user.roles.each do |role| %>
              <table class="table table-bordered">
              <tr>
                <td><%= role.name.titleize %></td>
                <td><%= link_to 'Remove role', assign_role_path(user.roles),  method: :delete, data: { confirm: 'Are you sure?' } %></td>
              </tr>
              </table>
             <% end %>

在控制台中，我可以做:

Organisation.find_roles(nil, User.find_by(organisation_id:1))
  User Load (0.4ms)  SELECT  "users".* FROM "users" WHERE "users"."organisation_id" = $1 LIMIT $2  [["organisation_id", 1], ["LIMIT", 1]]
  Role Load (0.7ms)  SELECT "roles".* FROM "roles" INNER JOIN "users_roles" ON "roles"."id" = "users_roles"."role_id" WHERE "users_roles"."user_id" = $1 AND (resource_type IN ('Organisation'))  [["user_id", 43]]
 => #<ActiveRecord::AssociationRelation [#<Role id: 3, name: "asdf", resource_type: "Organisation", resource_id: 1, created_at: "2016-10-24 23:00:40", updated_at: "2016-10-24 23:00:40">, #<Role id: 4, name: "ffff", resource_type: "Organisation", resource_id: 1, created_at: "2016-11-09 00:26:56", updated_at: "2016-11-09 00:26:56">]> 

用户有 2 个角色。

当我尝试删除其中一个时，我收到一条错误消息:

undefined method `[]' for nil:NilClass

该错误在我的分配角色 Controller 的销毁操作中提示这个公式(这是某人对另一个 SO 帖子的建议的副本):

role = params[:user][:roles]

当我尝试销毁操作时:

def destroy
    user = User.find_by_id(params[:id])
    assigned_role = user.roles
    organisation = Organisation.find(current_user.organisation)

    # byebug

    user.remove_role assigned_role.display_name, organisation

    flash[:notice] = "Successfully created"
    redirect_to root_path
  end

然后我收到一条错误消息:

undefined method `roles' for nil:NilClass

我认为该错误可能与我试图从用户中删除一个角色有关，但我使用复数来找到它们。我不确定如何找到我在使用索引中引用的特定角色。

谁能帮我解决这个问题？

Answer 1

请引用一次。

 def destroy
    user = User.find_by_id(params[:id])
    assigned_role = user.role_name
    organisation = Organisation.find(current_user.organisation)

    # byebug

    user.remove_role assigned_role, organisation

    flash[:notice] = "Successfully created"
    redirect_to root_path
  end