我正在开发一个Rails应用程序,它有两个名称空间,分别是用于管理员的admin和用于移动设备的api
昨天发生了一件奇怪的事。我在我的PostgreSQL数据库中创建了一个新表,由id、name、created\u at、Update\u at组成。
我试图使用名称空间获取所有设施http://localhost:3000/admin/facilities它运行良好(返回HTML和工具列表)。
Started GET "/admin/facilities" for ::1 at 2015-05-10 16:12:47 +0800
Processing by Admin::FacilitiesController#index as HTML
Facility Load (0.4ms) SELECT "facilities".* FROM "facilities"
Rendered admin/facilities/index.html.erb within layouts/application (2.5ms)
Completed 200 OK in 91ms (Views: 90.4ms | ActiveRecord: 0.4ms)
但是当我打电话的时候http://localhost:3000/api/v1/facilities来自浏览器,它应该返回JSON。我出错了
在Api::V1::FacilitiesController#索引未定义的方法'new'为零:NilClass
Extracted source (around line #8):
6 def index
7 @facilities = Facility.all
8 render json: @facilities
9 end
10
11
来自控制台的错误
Started GET "/api/v1/facilities" for ::1 at 2015-05-10 16:38:26 +0800
Processing by Api::V1::FacilitiesController#index as HTML
User Load (0.6ms) SELECT "users".* FROM "users" WHERE "users"."id" IS NULL ORDER BY "users"."id" ASC LIMIT 1
Facility Load (0.5ms) SELECT "facilities".* FROM "facilities"
Completed 500 Internal Server Error in 6ms (ActiveRecord: 1.1ms)
NoMethodError (undefined method `new' for nil:NilClass):
app/controllers/api/v1/facilities_controller.rb:8:in `index'
Rendered /Users/abrahamks/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/_source.erb (7.1ms)
Rendered /Users/abrahamks/.rvm/gems/ruby-2.2.1/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.7ms)
. . . .
. . . .
and so on
我从rails c检查并调用设施。看起来命令行返回了正确的值,但我不理解为什么它不能呈现/返回json。
Loading development environment (Rails 4.2.1)
2.2.1 :001 > Facility.all
Facility Load (0.5ms) SELECT "facilities".* FROM "facilities"
=> #<ActiveRecord::Relation [#<Facility id: 1, name: "Kitchen", created_at: "2015-05-09 10:54:00", updated_at: "2015-05-09 16:08:48">, #<Facility id: 2, name: "Washer", created_at: "2015-05-09 11:20:40", updated_at: "2015-05-09 16:09:32">, #<Facility id: 3, name: "Swimming Pool", created_at: "2015-05-09 11:22:19", updated_at: "2015-05-09 16:09:41">, #<Facility id: 4, name: "Internet", created_at: "2015-05-09 11:24:02", updated_at: "2015-05-09 16:12:31">, #<Facility id: 5, name: "Dryer", created_at: "2015-05-09 15:55:36", updated_at: "2015-05-09 16:12:54">]>
我的代码怎么了?有没有我错过的配置?非常感谢。
#GET/facilities/1设施与属性有多对多关系,我生成一个连接表
class CreateJoinTablePropertiesFacilities < ActiveRecord::Migration
def change
create_join_table :properties, :facilities do |t|
t.index [:property_id, :facility_id]
t.index [:facility_id, :property_id]
end
end
end
这是我的设备。rb
class Facility < ActiveRecord::Base
has_and_belongs_to_many :property, join_table: :facilites_properties
end
这是我的routes.rb
Rails.application.routes.draw do
namespace :admin do
resources :facilities
end
namespace :api do
namespace :v1 do
resources :properties
resources :facilities, only: [:index, :show]
resources :users do
member do
post 'list', :to => "users#list_property"
end
end
这是我的应用程序/控制器/api/v1/facilities\u控制器
class Api::V1::FacilitiesController < ApplicationController
before_action :set_facility, only: [:show, :edit, :update, :destroy]
# before_action :authenticate
# GET /facilities
# GET /facilities.json
def index
@facilities = Facility.all
render json: @facilities
end
# GET /facilities/1
# GET /facilities/1.json
def show
render json: @facility
end
private
# Use callbacks to share common setup or constraints between actions.
def set_facility
@facility = Facility.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def facility_params
params.require(:facility).permit(:name)
end
end
这是app/controllers/admin/facilities\u controller
class Admin::FacilitiesController < ApplicationController
before_action :set_facility, only: [:show, :edit, :update, :destroy]
# before_action :authenticate
# GET /facilities
# GET /facilities.json
def index
@facilities = Facility.all
end
# GET /facilities/1
# GET /facilities/1.json
def show
end
# GET /facilities/new
def new
@facility = Facility.new
end
# GET /facilities/1/edit
def edit
end
# POST /facilities
# POST /facilities.json
def create
@facility = Facility.new(facility_params)
respond_to do |format|
if @facility.save
format.html { redirect_to admin_facilities_path, notice: 'Facility was successfully created.' }
format.json { render :show, status: :created, location: @facility }
else
format.html { render :new }
format.json { render json: @facility.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /facilities/1
# PATCH/PUT /facilities/1.json
def update
respond_to do |format|
if @facility.update(facility_params)
format.html { redirect_to admin_facilities_path, notice: 'Facility was successfully updated.' }
format.json { render :show, status: :ok, location: @facility }
else
format.html { render :edit }
format.json { render json: @facility.errors, status: :unprocessable_entity }
end
end
end
# DELETE /facilities/1
# DELETE /facilities/1.json
def destroy
@facility.destroy
respond_to do |format|
format.html { redirect_to facilities_url, notice: 'Facility was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_facility
@facility = Facility.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def facility_params
params.require(:facility).permit(:name)
end
end
我刚刚意识到我忘了生成序列化程序。因为我使用gem活动模型序列化程序,所以这就是我生成序列化程序所做的。
rails g序列化工具
堆栈跟踪显示请求已作为HTML处理。
Processing by Admin::FacilitiesController#index as HTML
当您试图呈现JSON时,您可以指定控制器来响应JSON
module Api
module V1
class FacilitiesController < ApplicationController
respond_to :json
end
end
end
或者可以在路由中指定json作为默认响应。rb文件
namespace :api, defaults: { format: 'json' } do
# your api json routes...
end
希望其中任何一个有帮助。
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