我有用户模型和角色模型。
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_one :role
def has_role?(role_name)
self.role == Role.where(name: role_name).first
end
def add_role(role_name)
role = Role.where(name: role_name).first
self.role = role unless role.blank?
end
end
class Role < ActiveRecord::Base
belongs_to :user
end
目前，我的应用有2个用户角色;管理员构件。
我现在要做的是，让管理员能够使用select标记更改成员的角色（从管理员到成员或从成员到管理员）。
我在 views / users / _form.html.erb
中有这个<div class="col-md-4">
<%= form_for(@user) do |f| %>
<% if @user.errors.any? %>
<div id="error_explanation">
<p><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</p>
<ul>
<% @user.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="form-group">
<%= f.label :email %><br>
<%= f.text_field :email, class: "form-control" %>
<%= f.label :role %>
<%= f.select :role_id, options_for_select(Role.all.map{|c| [c.name, c.id]}, f.object.role_id)%>
</div>
<%= f.submit 'Save user', :class => 'btn btn-primary' %>
<%= link_to 'Back', users_path, class: "btn btn-primary" %>
<% end %>
</div>
这是我的用户控制器：
class UsersController < ApplicationController
before_action :authenticate_user!
before_action :set_user, only: [:show, :edit, :update, :destroy]
# GET /users
# GET /users.json
def index
@users = User.all
end
# GET /users/1
# GET /users/1.json
def show
end
# GET /users/1/edit
def edit
end
# PATCH/PUT /users/1
# PATCH/PUT /users/1.json
def update
respond_to do |format|
if @user.update(user_params)
format.html { redirect_to users_path, notice: 'user was successfully updated.' }
format.json { render :show, status: :ok, location: @user }
else
format.html { render :edit }
format.json { render json: @user.errors, status: :unprocessable_entity }
end
end
end
# DELETE /users/1
# DELETE /users/1.json
def destroy
@user.destroy
respond_to do |format|
format.html { redirect_to users_url, notice: 'user was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_user
@user = User.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def user_params
params.require(:user).permit(:email, :encrypted_password)
end
end
这是我的 routes.rb ：
Rails.application.routes.draw do
devise_for :users
root "orders#index"
resources :orders
resources :drinks
resources :foods
# link to change foods/drinks status from 0 (processing) to 1 (done)
get '/orders/:id/update_foods_status', to: 'orders#update_foods_status', as: :update_foods_status
get '/orders/:id/update_drinks_status', to: 'orders#update_drinks_status', as: :update_drinks_status
# kitchen foods orders
get 'kitchen_foods', to: 'kitchen_foods#index'
# kitchen drinks orders
get 'kitchen_drinks', to: 'kitchen_drinks#index'
# list of all users
get 'users', to: 'users#index', as: :all_users
# single user
get 'users/:id', to: 'users#show', as: :single_user
# edit user
get 'users/:id/edit', to: 'users#edit', as: :edit_user
end
更新：这是我在运行后获得的rake routes
Prefix Verb URI Pattern Controller#Action
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
root GET / orders#index
orders GET /orders(.:format) orders#index
POST /orders(.:format) orders#create
new_order GET /orders/new(.:format) orders#new
edit_order GET /orders/:id/edit(.:format) orders#edit
order GET /orders/:id(.:format) orders#show
PATCH /orders/:id(.:format) orders#update
PUT /orders/:id(.:format) orders#update
DELETE /orders/:id(.:format) orders#destroy
drinks GET /drinks(.:format) drinks#index
POST /drinks(.:format) drinks#create
new_drink GET /drinks/new(.:format) drinks#new
edit_drink GET /drinks/:id/edit(.:format) drinks#edit
drink GET /drinks/:id(.:format) drinks#show
PATCH /drinks/:id(.:format) drinks#update
PUT /drinks/:id(.:format) drinks#update
DELETE /drinks/:id(.:format) drinks#destroy
foods GET /foods(.:format) foods#index
POST /foods(.:format) foods#create
new_food GET /foods/new(.:format) foods#new
edit_food GET /foods/:id/edit(.:format) foods#edit
food GET /foods/:id(.:format) foods#show
PATCH /foods/:id(.:format) foods#update
PUT /foods/:id(.:format) foods#update
DELETE /foods/:id(.:format) foods#destroy
update_foods_status GET /orders/:id/update_foods_status(.:format) orders#update_foods_status
update_drinks_status GET /orders/:id/update_drinks_status(.:format) orders#update_drinks_status
kitchen_foods GET /kitchen_foods(.:format) kitchen_foods#index
kitchen_drinks GET /kitchen_drinks(.:format) kitchen_drinks#index
all_users GET /users(.:format) users#index
single_user GET /users/:id(.:format) users#show
edit_user GET /users/:id/edit(.:format) users#edit
我的问题：
当我导航到/users/1/edit时，我收到此错误：
NoMethodError in Users#edit
undefined method `user_path' for #<#<Class:0x007fb702901c88>:0x007fb70098aaf8>
如何解决此问题？
我发现this answer但我无法理解它。希望得到更好的解释和回答。
注意：我正在使用Devise gem。
答案 0 :(得分：4)
你的路线档案中有：
devise_for :users
增加了：
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
现在您要做的是允许管理员编辑用户。为此您已定义：
# list of all users
get 'users', to: 'users#index', as: :all_users
# single user
get 'users/:id', to: 'users#show', as: :single_user
# edit user
get 'users/:id/edit', to: 'users#edit', as: :edit_user
生成：
all_users GET /users(.:format) users#index
single_user GET /users/:id(.:format) users#show
edit_user GET /users/:id/edit(.:format) users#edit
现在，您正在撰写<%= form_for(@user) do |f| %>表单，默认情况下正在搜索user_path。因此，而不是您定义的不同路线，只需添加：
resources :users
将生成您需要的所有必要路线，并将表格映射到正确的路径。这将节省大量开销，如仅使用此<%= form_for(@user) do |f| %>将在用户是新对象时将您带到创建操作，如果用户是持久对象，它将带您进行更新操作。
或者，如果您需要使用路线，则需要执行以下操作：
<%= form_for(@user, url: edit_user_path, method: :get) do |f| %>
但在表单提交中使用GET方法总是一个坏主意。这些链接可能对您有所帮助：
When should I use GET or POST method? What's the difference between them?
When do you use POST and when do you use GET?
<强>更新
由于您需要从多个角色为用户分配一个角色，最好使用这样的选择框：
f.collection_select(:role_id, Role.all, :id, :name)
假设user表具有属性role_id而role表具有属性name。因此，这将允许您为用户分配角色。您要打印的是user.role，它将始终打印关联而不是角色名称。
希望这有帮助。
答案 1 :(得分：0)
如果要链接到编辑页面，请尝试使用edit_user_path而不是user_path。如果您查看routes.rb文件，则没有user_path的路由。