我有一个死的简单的rails应用程序w / rails4和mongoid。我可以像魅力一样创建新的数据集。但我无法更新现有的数据集。
有人有这个问题吗？这是怎么回事，我做错了什么？
刚从头开始创建rails 4，ruby 2和mongoid，所有这些都来自他们的git回购：
rails new mongotest --skip-active-record
我生成了一个脚手架：
rails g scaffold things name description
我的模型现在看起来像这样：
class Thing
include Mongoid::Document
field :name, type: String
field :description, type: String
end
这样的控制器：
class ThingsController < ApplicationController
before_action :set_thing, only: [:show, :edit, :update, :destroy]
# GET /things
# GET /things.json
def index
@things = Thing.all
end
# GET /things/1
# GET /things/1.json
def show
end
# GET /things/new
def new
@thing = Thing.new
end
# GET /things/1/edit
def edit
end
# POST /things
# POST /things.json
def create
@thing = Thing.new(thing_params)
respond_to do |format|
if @thing.save
format.html { redirect_to @thing, notice: 'Thing was successfully created.' }
format.json { render action: 'show', status: :created, location: @thing }
else
format.html { render action: 'new' }
format.json { render json: @thing.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /things/1
# PATCH/PUT /things/1.json
def update
respond_to do |format|
if @thing.update(thing_params)
format.html { redirect_to @thing, notice: 'Thing was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: @thing.errors, status: :unprocessable_entity }
end
end
end
# DELETE /things/1
# DELETE /things/1.json
def destroy
@thing.destroy
respond_to do |format|
format.html { redirect_to things_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_thing
@thing = Thing.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def thing_params
params.require(:thing).permit(:name, :description)
end
end
我的Gemfile：
source 'https://rubygems.org'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', git: 'https://github.com/rails/rails.git'
gem 'arel', git: 'https://github.com/rails/arel.git'
gem 'activerecord-deprecated_finders', git: 'https://github.com/rails/activerecord-deprecated_finders.git'
gem 'thin'
gem 'mongoid', git: 'https://github.com/mongoid/mongoid.git'
# Gems used only for assets and not required
# in production environments by default.
group :assets do
gem 'sass-rails', '~> 4.0.0.beta1'
gem 'coffee-rails', '~> 4.0.0.beta1'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
gem 'uglifier', '>= 1.0.3'
end
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 1.0.1'
这是在尝试更新数据集时来自日志：
Started PATCH "/things/51669078e05658cf22000001" for 127.0.0.1 at 2013-04-11 12:29:25 +0200
Processing by ThingsController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"lfELkffFSf9gk04TnHnzG9cCrOe3XrsjK4fEZ7Rt7qQ=", "thing"=>{"name"=>"qqqq", "description"=>"qqqqq"}, "commit"=>"Update Thing", "id"=>"51669078e05658cf22000001"}
MOPED: 127.0.0.1:27017 QUERY database=mongotest_development collection=things selector={"_id"=>"51669078e05658cf22000001"} flags=[:slave_ok] limit=0 skip=0 batch_size=nil fields=nil (0.5772ms)
Redirected to http://localhost:3000/things/51669078e05658cf22000001
Completed 302 Found in 6ms
如果有人有任何提示或链接......非常感谢帮助。
更新1 ：我确实在rails 3环境中尝试了它并且它的工作原理......完全像预期的那样。
更新2 ：带有“Mongoid.logger.level = Logger :: DEBUG”和“Moped.logger.level = Logger :: DEBUG”的记录器输出：
Started PATCH "/things/5166c5ece05658f08a000001" for 127.0.0.1 at 2013-04-11 16:20:56 +0200
Processing by ThingsController#update as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"lfELkffFSf9gk04TnHnzG9cCrOe3XrsjK4fEZ7Rt7qQ=", "thing"=>{"name"=>"EditTest", "description"=>"123"}, "commit"=>"Update Thing", "id"=>"5166c5ece05658f08a000001"}
D, [2013-04-11T16:20:56.450464 #37961] DEBUG -- : MOPED: 127.0.0.1:27017 QUERY database=mongotest_development collection=things selector={"_id"=>"5166c5ece05658f08a000001"} flags=[:slave_ok] limit=0 skip=0 batch_size=nil fields=nil (0.7041ms)
Redirected to http://localhost:3000/things/5166c5ece05658f08a000001
Completed 302 Found in 6ms
更新3 ：我用于上次日志输出的mongoid.yml：
development:
# Configure available database sessions. (required)
sessions:
# Defines the default session. (required)
default:
# Defines the name of the default database that Mongoid can connect to.
# (required).
database: mongotest_development
# Provides the hosts the default session can connect to. Must be an array
# of host:port pairs. (required)
hosts:
- localhost:27017
options:
# Change whether the session persists in safe mode by default.
# (default: false)
safe: true
我的示例应用程序位于https://github.com/jlxq0/mongotest
更新4 ：更多研究显示此/可能/是类似问题，如Rails 4.0.0.beta 1 and Mongoid
如果没有人有答案我也很高兴如果有人分享到工作rails4 / Mongo示例源的链接，那么我可以自己找出差异。
更新5 ：在Rails控制台中，更新工作正常。
答案 0 :(得分：8)
这是因为update不接受属性，只接受@thing.update(validate: false)等选项。
为了使您的代码有效，您可以执行以下操作：
if @thing.update_attributes(thing_params)
#...
end
或者：
@thing.attributes = thing_params
if @thing.save
#...
end
或者：
@thing.attributes = thing_params
if @thing.update
#...
end
答案 1 :(得分：0)
MongoDB有一种称为安全模式的东西，它默认是关闭的，这意味着无论你告诉它执行它，它都会返回OK。如果将安全模式设置为on，如果执行mongo标准非法的查询，则会引发异常。
在开发方面你通常会做的就是这个，
development:
sessions:
default:
hosts:
- localhost:27017
database: mongoid
username: user
password: password
options:
safe: true
之后您可以将您的例外情况发给我们，我们可以尝试解决它！
答案 2 :(得分：0)
如果您正在使用嵌入式属性（无论是动态创建的哈希还是明确定义的关系），使用upsert代替update可能会有所帮助。
如果条目存在，则Upsert会重写该字段，如果不存在，则会创建。
即。
person = Person.new(
first_name: "Heinrich",
last_name: "Heine"
)
person.upsert