标签: mongoid

我需要在使用MongoDB的应用程序中人性化一些属性Mongoid.似乎旧的做事方式就像

def self.human_attribute_name(attr, options = {})
  HUMANIZED_ATTRIBUTES[attr.to_sym] || super
end

但这已经被i18n方法所取代.在他们自己的文件中覆盖似乎是一种更清洁的方法.尽管如此,我可以说,这是一个产品ActiveRecord.使用时有没有办法实现同样的目的Mongoid？

我正在使用MongoDB,但我并没有真正使用它的动态字段功能

  field :fb_followers => Integer
  field :twitter_followers => Integer
  field :twitter_rts => Integer
  field :link_visiting => Integer
  field :reduce_points_per_day => Integer

我该如何写这个,所以每个字段对于模型都是可选的？

使用Ruby和Haml,我有一个成本的属性.我相信(我是红宝石的新手),它将是一个Float

目前,下面的行输出我的十进制格式,如4.5而不是4.50,这就是我想要的.

%span.value= "£#{event.beers.first.cost)}"

这是我的啤酒类文件.

class Beer
  include Mongoid::Document
  embeds_many :ratings

  field :name, type: String
  field :country, type: Country
  field :cost, type: Float
  field :photos, type: PhotoArray, default: PhotoArray.new
end

我正在尝试优化mongodb查询.我有一个指标from_account_id,to_account_id和created_at.但是以下查询执行完整集合扫描.

{
    "ts": {
        "$date": "2012-03-18T20:29:27.038Z"
    },
    "op": "query",
    "ns": "heroku_app2281692.transactions",
    "query": {
        "$query": {
            "$or": [
                {
                    "from_account_id": {
                        "$oid": "4f55968921fcaf0001000005"
                    }
                },
                {
                    "to_account_id": {
                        "$oid": "4f55968921fcaf0001000005"
                    }
                }
            ]
        },
        "$orderby": {
            "created_at": -1
        }
    },
    "ntoreturn": 25,
    "nscanned": 2643718,
    "responseLength": 20,
    "millis": 10499,
    "client": "10.64.141.77",
    "user": "heroku_app2281692"
}

如果我不做or,只查询from_account_id或to_account_id订单,它很快.

获得理想效果的最佳方法是什么？我应该像一个数组一样在一个字段中保留account_ids(来自和来自)或许还有更好的方法.谢谢!

我想update_attributes,而不是检查信息是否更改

您只需将此代码传递给rails console现有的rails + mongoid项目即可

class TestModel
  include Mongoid::Document
  include Mongoid::Timestamps
  field :name, type: String
end

test = TestModel.new({:name => "name 1"})
test.save()
=> true

test
=> created_at: 2012-11-14 13:48:26 UTC, updated_at: 2012-11-14 13:48:26 UTC

test.changed?
=> false
test.name_changed?
=> false

test.update_attributes({:name => "name 2"})
=> true

test.changed?
=> false
test.name_changed?
=> false

test
=> created_at: 2012-11-14 13:48:26 UTC, updated_at: 2012-11-14 13:49:23 UTC

我做错了什么或这是一个错误？

这一定是一个简单的,但我被卡住了...所以我使用Rails#3和Mongoid,并希望动态构建依赖于传递参数的查询,然后执行find().就像是

def select_posts
    query = :all # pseudo-code here
    if (params.has_key?(:author))
        query += where(:author => params[:author]) # this is pseudo-code again
    end

    if (params.has_key?(:post_date))
        query += where(:create_date => params[:post_date]) # stay with me
    end

    @post_bodies = []
    Post.find(query).each do |post| # last one
        @post_bodies << post.body
    end

    respond_to do |format|
        format.html
        format.json { render :json => @post_bodies }
    end
end

我有一个带验证的模型,如下所示:

class Order
  include Mongoid::Document

  field :first_name, type: String
  field :last_name, type: String

  validates_presence_of :first_name, :message => "Can't be empty"
  validates_presence_of :last_name, :message => "Can't be empty"
end

我描述模型rspec和思想机器人shoulda:

describe Order do
  # validations
  it { should validate_presence_of(:first_name) }
  it { should presence_of(:last_name) }
end

但是我失败了:

Failures:

  1) Order 
     Failure/Error: it { should validate_presence_of(:first_name) }
       Expected errors to include "can't be blank" when first_name is set to nil, got errors: ["first_name Can't be empty (nil)", …

我有这两个模型:

class Presentation
  include Mongoid::Document
  embeds_many :presentation_rows
end

class PresentationRow
  include Mongoid::Document
  embedded_in :presentation
end

在我的presentation_rows_controller.rb中,我有以下几行代码:

def show
  @presentation = Presentation.find(params[:id])
  @presentation_rows = @presentation.presentation_rows
end

def destroy
  ...
  ...
end

在我的presentation_rows/show.html.haml中,我有以下几行代码:

- @presentation_rows.each do |presentation_row|
  = link_to "Delete", presentation_row, method: :delete

我在destroy控制器动作中尝试了很多方法,但它们都指向了一个显而易见的事实,即我试图破坏嵌入式文档而不通过它的父级.但是现在我在我的视图文件中有了它的id的presentation_row,我不应该被允许销毁它.

带有空毁灭动作的错误消息,fyi:

Started DELETE "/en/presentation_rows/516af0a983c336708300000f" for 127.0.0.1 at 2013-04-14 20:08:47 +0200
Processing by PresentationRowsController#destroy as HTML
  Parameters: {"authenticity_token"=>"KHGG2dsTseCl88okOKW9JAlHb+VaK2lKIxb0ptAIC7A=", "locale"=>"en", "id"=>"516af0a983c336708300000f"}
  MOPED: 127.0.0.1:27017 QUERY        database=shop_import_development collection=users selector={"$query"=>{"_id"=>"511a813a83c336a0ea000001"}, "$orderby"=>{:_id=>1}} flags=[:slave_ok] limit=-1 skip=0 fields=nil (0.3152ms)
  MOPED: 127.0.0.1:27017 QUERY        database=shop_import_development collection=presentations selector={"_id"=>"516af0a983c336708300000f"} flags=[:slave_ok] …

我是MongoDB和Mongoid的新手,Mongoid 3.1.4用于我的Rails(3.2.13)应用程序.我在遗留代码中看到人们使用两者type: Moped::BSON::ObjectId和type: String某处的参考模型.

例

class Team
  include Mongoid::Document

  field :room_id, type: String
  field :leader_id, type: Moped::BSON::ObjectId

  ...
end

(使用git blame我知道由2个不同的人写的这两行)

我做了一个搜索,但没有找到问题的答案何时/为什么使用什么类型？String要么Moped::BSON::ObjectId

谢谢,

我想这将是简单,当我实现它,但是经过一番搜索,谷歌搜索和文档的扫描,我似乎无法找到答案.

我有一个字段是一个散列,其中键是id,值是其他id的数组.例如:

{"52ab84929938c7f966d4f116"=>["52ab84919938c7f966d4ee7d"],
 "52ab84929938c7f966d4f117"=>["52ab84919938c7f966d4ee7d"],
 "52ab84929938c7f966d4f0cc"=>["52ab84919938c7f966d4ee7d", "52ab84929938c7f966d4f13d"],
 "52ab84929938c7f966d4f147"=>["52ab84919938c7f966d4ee7d"]}

这可能更适合图形类型的数据库,但我不熟悉这项技术,并已经围绕Mongoid构建了我的应用程序的其余部分.对于另一个复杂的问题,这是我能提出的最简单的解决方案.

所以我的问题是如何搜索记录,例如id:52ab84929938c7f966d4f0cc作为哈希字段中的键？

我尝试像这样做数组样式并返回零结果:

Course.all_in(:skills_available => sk.id)

而且我知道这不起作用,但如果它做到了会很好:

Course.where(:skills_available.key => sk.id)