我的用户ID不能保存，我不明白为什么。 我在两个模型中添加了关联，并将user_id添加到通知参数中，但用户ID不会自动保存。
campus_id关系确实可以正常工作，但我并没有真正看到它们之间的区别。可能是什么问题呢？我正在使用一个postgress数据库。
rails服务器日志
Rendered /usr/local/rvm/gems/ruby-2.1.1@rails4/gems/actionpack-4.0.2/lib/action_dispatch/middleware/templates/rescues/routing_error.erb within rescues/layout (59.4ms)
Started POST "/campus/1/notifications" for 84.193.153.106 at 2014-10-18 19:41:03 +0000
Started POST "/campus/1/notifications" for 84.193.153.106 at 2014-10-18 19:41:03 +0000
Processing by NotificationsController#create as HTML
Processing by NotificationsController#create as HTML
Parameters: {"utf8"=>"_", "authenticity_token"=>"L9RH3hZyAKqzq9/kuJJDNaEHNVca2DbQSKSZLc8iTuw=", "notification"=>{"post"=>"thisisatest"}, "commit"=>"Maak notificatie", "campu_id"=>"1"}
Parameters: {"utf8"=>"_", "authenticity_token"=>"L9RH3hZyAKqzq9/kuJJDNaEHNVca2DbQSKSZLc8iTuw=", "notification"=>{"post"=>"thisisatest"}, "commit"=>"Maak notificatie", "campu_id"=>"1"}
Campus Load (0.6ms) SELECT "campus".* FROM "campus" WHERE "campus"."id" = $1 LIMIT 1 [["id", "1"]]
Campus Load (0.6ms) SELECT "campus".* FROM "campus" WHERE "campus"."id" = $1 LIMIT 1 [["id", "1"]]
User Load (0.5ms) SELECT "users".* FROM "users" WHERE "users"."id" = 1 ORDER BY "users"."id" ASC LIMIT 1
User Load (0.5ms) SELECT "users".* FROM "users" WHERE "users"."id" = 1 ORDER BY "users"."id" ASC LIMIT 1
(0.2ms) BEGIN
(0.2ms) BEGIN
SQL (134.0ms) INSERT INTO "notifications" ("campus_id", "created_at", "post", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id" [["campus_id", 1], ["created_at", Sat, 18 Oct 2014 19:41:03 UTC +00:00], ["post", "thisisatest"], ["updated_at", Sat, 18 Oct 2014 19:41:03 UTC +00:00]]
SQL (134.0ms) INSERT INTO "notifications" ("campus_id", "created_at", "post", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id" [["campus_id", 1], ["created_at", Sat, 18 Oct 2014 19:41:03 UTC +00:00], ["post", "thisisatest"], ["updated_at", Sat, 18 Oct 2014 19:41:03 UTC +00:00]]
(42.1ms) COMMIT
(42.1ms) COMMIT
Redirected to https://sl-backoffice-c9-christoph88.c9.io/notifications/9
Redirected to https://sl-backoffice-c9-christoph88.c9.io/notifications/9
Completed 302 Found in 188ms (ActiveRecord: 177.4ms)
Completed 302 Found in 188ms (ActiveRecord: 177.4ms)
通知模型
class Notification < ActiveRecord::Base
belongs_to :campus
belongs_to :user
validates :post, presence: true
validates :campus_id, presence: true
end
用户模型
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable,
:confirmable
has_many :notifications
has_many :spotlights
end
通知控制器
class NotificationsController < ApplicationController
before_action :set_notification, only: [:show, :edit, :update, :destroy]
before_action :set_campus, only: [:index, :new, :create]
before_action :authenticate_user!
def index
@notifications = @campus.notifications
end
def show
@campus = @notification.campus
end
def new
@notification = @campus.notifications.build
end
def edit
end
def create
@notification = @campus.notifications.build(notification_params)
respond_to do |format|
if @notification.save
format.html { redirect_to @notification }
format.json { render action: 'show', status: :created, location: @notification }
flash[:success] = 'Notification was successfully created.'
else
format.html { render action: 'new' }
format.json { render json: @notification.errors, status: :unprocessable_entity }
end
end
end
def update
respond_to do |format|
if @notification.update(notification_params)
format.html { redirect_to @notification }
format.json { head :no_content }
flash[:success] = 'Notification was successfully updated.'
else
format.html { render action: 'edit' }
format.json { render json: @notification.errors, status: :unprocessable_entity }
end
end
end
def destroy
@notification.destroy
respond_to do |format|
format.html { redirect_to campu_notifications_url(@notification.campus_id) }
format.json { head :no_content }
flash[:error] = 'Notification was successfully deleted.'
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_notification
@notification = Notification.find(params[:id])
end
def set_campus
@campus = Campus.find(params[:campu_id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def notification_params
params.require(:notification).permit(:post, :campus_id, :user_id)
end
end
schema.rb
# encoding: UTF-8
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20141018121628) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
create_table "campus", force: true do |t|
t.string "name"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "collis", force: true do |t|
t.string "name"
t.text "teaser"
t.text "description"
t.string "coursetype"
t.text "target"
t.string "campus"
t.datetime "startdate"
t.datetime "created_at"
t.datetime "updated_at"
t.string "guid"
end
create_table "coursespotlights", force: true do |t|
t.boolean "spotlight"
t.integer "colli_id"
t.datetime "start"
t.datetime "stop"
t.string "colli_guid"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "coursespotlights", ["colli_id"], name: "index_coursespotlights_on_colli_id", using: :btree
create_table "notifications", force: true do |t|
t.text "post"
t.datetime "created_at"
t.datetime "updated_at"
t.integer "campus_id"
t.integer "user_id"
end
add_index "notifications", ["campus_id"], name: "index_notifications_on_campus_id", using: :btree
add_index "notifications", ["user_id"], name: "index_notifications_on_user_id", using: :btree
create_table "spotlights", force: true do |t|
t.boolean "spotlight"
t.datetime "start"
t.datetime "stop"
t.string "name"
t.text "teaser"
t.datetime "coursedate"
t.datetime "created_at"
t.datetime "updated_at"
t.integer "campus_id"
t.integer "user_id"
end
add_index "spotlights", ["user_id"], name: "index_spotlights_on_user_id", using: :btree
create_table "users", force: true do |t|
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.datetime "created_at"
t.datetime "updated_at"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true, using: :btree
end
答案 0 :(得分：0)
因为user_id不是参数的一部分
来自日志：
Parameters: {"utf8"=>"_", "authenticity_token"=>"L9RH3hZyAKqzq9/kuJJDNaEHNVca2DbQSKSZLc8iTuw=", "notification"=>{"post"=>"thisisatest"}, "commit"=>"Maak notificatie", "campu_id"=>"1"}
然后来自强参数的行过滤掉不需要的内容
params.require(:notification).permit(:post, :campus_id, :user_id)
这意味着只允许"notification"=>{"post"=>"thisisatest"}部分
然后从sql插入：
SQL (134.0ms) INSERT INTO "notifications" ("campus_id", "created_at", "post", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "id" [["campus_id", 1], ["created_at", Sat, 18 Oct 2014 19:41:03 UTC +00:00], ["post", "thisisatest"], ["updated_at", Sat, 18 Oct 2014 19:41:03 UTC +00:00]]
你在这里有campus_id，因为你正在对@campus进行更新：
@campus.notifications.build(notification_params)
所以，只需确保user_id作为通知的一部分进入，就是这样！