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我有一个带有 rails4 和 mongoid 的简单的 Rails 应用程序。我可以像魅力一样创建新的数据集。但我无法更新现有数据集。

有人有这个问题吗？这是如何工作的，我做错了什么？

刚刚使用 rails 4、ruby 2 和 mongoid 从头开始​​创建，全部来自他们的 git repos：

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

像这样的控制器：

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

我的宝石文件：

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'

这是尝试更新数据集时的日志：

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 环境中尝试过，它可以正常工作……完全符合预期。

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：我用于最后一个日志输出的 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：更多研究表明，这 /could/ 是类似Rails 4.0.0.beta 1 和 Mongoid的问题

如果没有人有答案，如果有人分享了一个指向工作 rails4 / Mongo 示例源的链接，我也会很高兴，这样我就可以自己找出差异。

更新 5：在 Rails 控制台中，更新工作得很好。

4

3 回答 3

8

这是因为update它不接受属性，它只接受选项，比如@thing.update(validate: false).

为了使您的代码正常工作，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
于 2013-04-12T13:33:57.483 回答
0

MongoDB 有一种叫做安全模式的东西，默认情况下它是关闭的，这意味着无论你告诉它执行什么，它都会为它返回 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。

在开发中，您通常会这样做，

development:
  sessions:
    default:
      hosts:
        - localhost:27017
      database: mongoid
      username: user
      password: password
      options:
        safe: true

之后，您可以向我们发布您的异常，我们可以尝试解决它！

于 2013-04-11T14:21:08.733 回答
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而不是update可能会有所帮助。

如果条目存在，则 Upsert 会导致字段被重写，如果不存在则创建。

IE

person = Person.new(
  first_name: "Heinrich",
  last_name: "Heine"
)
person.upsert

示例来自： http: //mongoid.org/en/mongoid/docs/persistence.html

于 2015-03-25T22:31:56.233 回答