#mongomapper

とあるサイトを思い立って、Rails 4.0 にアップグレードしました。 久しぶりすぎて、MongoDB (MongoHQ) を使っていることを忘れていたため、かなり軽い気持ちではじめましたが、これがなかなか。。

Rails 3.2.12を4.0.0にアップグレードした - 平凡なエンジニアの独り言

Installation in Rails 3 // MongoMapper

この辺を参考にして。

一般的なRailsのアップグレードで開発環境を立ち上げる

rake rails:update したり、config/routes.rb の match をpost/get に変更したり。

MongoMapperの対応

開発環境を立ち上げてみると、MongoMapperのコネクションエラー。 調べてみると、 stable なRails4 版はまだないんですね。。

MongoMapperのバージョンを指定

ベータ版を指定します。

gem 'mongo_mapper', :git => "git://github.com/mongomapper/mongomapper.git", :tag => "v0.13.0.beta2"

active_recordをはずす

config/application.rb の冒頭でrails 全てではなく、active_recordをのぞいてロードするように変更

require File.expand_path('../boot', __FILE__) require "action_controller/railtie" require "action_mailer/railtie" #require "active_resource/railtie" require "sprockets/railtie" require "rails/test_unit/railtie" require "image_size" require "open-uri"

config/environments/development.rb にもactive_record の設定をしている箇所があるので、変更

# Raise an error on page load if there are pending migrations # config.active_record.migration_error = :page_load

mongo.rb を削除

自動的に接続するように変更になったらしい。

$ rm config/initializers/mongo.rb

mongo.yml をURI表記に変更

データベース名とかユーザー名を個別に指定する方法だと接続できませんでした。謎。

development: uri: mongodb://:@.mongohq.com:/ # database: # host: .mongohq.com # port: # user: # password:

で、クラッシュ

開発環境で立ち上がったので、本番環境にリリース。ってことでHeroku に push しました。

ほほう。。

$ heroku logs --app=xxxxx 2014-02-16T02:36:24.812184+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/articles/4fe1753f5e63882228000072/weather_chart/month host=vn.dash-news.com request_id=7d2fa4b5-e48d-463f-a1a4-3e1855cd6058 fwd="66.249.64.27" dyno= connect= service= status=503 bytes= 2014-02-16T02:35:45.610615+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/a/4fd0c22a5e63887908000068/month host=vn.dash-news.com request_id=66b5620e-fc6c-4616-8815-6c3384ce207f fwd="157.55.34.99" dyno= connect= service= status=503 bytes= ....

MongoMapperの接続がうまく行ってないんだろうなーとか思いながら、production.rb を確認したり、「mongomapper rails4 app crashed」で検索したり。 結局わからず、眠くなったので睡眠。

そして原因は。。

悶々とした一晩を過ごし、 rails c production を"やっと"、思いついた。。

$ rails c production /Users/yosiyuki/.rvm/gems/ruby-2.0.0-p353/gems/activemodel-4.0.2/lib/active_model/validations/format.rb:46:in `check_options_validity': The provided regular expression is using multiline anchors (^ or $), which may present a security risk. Did you mean to use \A and \z, or forgot to add the :multiline => true option? (ArgumentError) from /Users/yosiyuki/.rvm/gems/ruby-2.0.0-p353/gems/activemodel-4.0.2/lib/active_model/validations/format.rb:20:in `check_validity!' from /Users/yosiyuki/.rvm/gems/ruby-2.0.0-p353/gems/activemodel-4.0.2/lib/active_model/validator.rb:143:in `initialize' from /Users/yosiyuki/.rvm/gems/ruby-2.0.0-p353/gems/activemodel-4.0.2/lib/active_model/validations/with.rb:87:in `new' from /Users/yosiyuki/.rvm/gems/ruby-2.0.0-p353/gems/activemodel-4.0.2/lib/active_model/validations/with.rb:87:in `block in validates_with' from /Users/yosiyuki/.rvm/gems/ruby-2.0.0-p353/gems/activemodel-4.0.2/lib/active_model/validations/with.rb:86:in `each' from /Users/yosiyuki/.rvm/gems/ruby-2.0.0-p353/gems/activemodel-4.0.2/lib/active_model/validations/with.rb:86:in `validates_with' from /Users/yosiyuki/.rvm/gems/ruby-2.0.0-p353/gems/activemodel-4.0.2/lib/active_model/validations/format.rb:111:in `validates_format_of'

ArgumentError ... ^ と $ はいけませんよ。と。

$ grep -r format app/models/* app/models/article.rb: key :url, String, :required => true, :format => URI::regexp(%w(http https)) app/models/category.rb: before_validation :format_children app/models/category.rb: def format_children app/models/contact.rb: key :mail, String, :require => true, :format => /^([a-z0-9_.-]+)@(([a-z0-9.-]+\.)[a-z]{2,})$/i app/models/link.rb: key :url, String, :required => true, :format => URI::regexp(%w(http https)) app/models/link.rb: before_validation :format_categories app/models/link.rb: def format_categories app/models/source/google_currency.rb: key :currency, String, :required => true, :format => /^[a-z]{3}$/ app/models/source/google_currency.rb: key :local_currency, String, :required => true, :format => /^[a-z]{3}$/ app/models/user.rb: key :mail, String, :require => true, :format => /^([a-z0-9_.-]+)@(([a-z0-9.-]+\.)[a-z]{2,})$/i

修正したら本番環境立ち上がった。。

MongoMapperをORMとして使っているプロジェクトがあり、その中でデータをバッチ的に削除する必要があったので、調べた。

destroy は削除時にCallback methodをcallし、deleteはCallback を callしない点は３つの方法で共通。

1. レコード単位に削除

document.delete document.destroy

2. 条件にマッチするレコードを一括削除

Document.delete_all Document.destroy_all

3. idを指定して一括削除

Document.delete('41341343', '341981314', '3143241387') Document.destroy('41341343', '341981314', '3143241387')

mongodb - Deleting records using Mongomapper in Rails - Stack Overflow

Right I am going to start by saying this is "A" way to do it , its not the only way to do it , and some may feel it isn't even the right way. I couldn't decided what to do with the configuration so I added to the database.yml. This way all the database settings are in the same sane place. So for this to work you will need to add the following to your database.yml yaml file.

mongo: host: localhost username: someusername password: somepassword

So it ends up looking like this for each environment , in this case development

development: adapter: mysql reconnect: false database: somedata pool: 5 username: root password: socket: /tmp/mysql.sock mongo: host: localhost username: someusername password: somepassword

The options that can be set are 

host - where the mongodb is running

username - the username to use , this is optional

password - the password to use , again optional

port - the port to use , if omitted it will use the standard mongo port 27017

database - the name of the collection to use , if omitted it will use the same name as the main setting. i.e. in the above example it will use "somedata" as the the collection name

Once you have added this to your configuration , you need need to make sure that you have added mongo , bson_ext and mongo_mapper to your Gemfile. for example 

gem 'mongo' gem 'bson_ext' gem 'mongo_mapper'

For more information on this see the mongo ruby driver docs at http://www.mongodb.org/display/DOCS/Ruby+Language+Center and mongo mapper docs at http://mongomapper.com/documentation/. 

Cool next find the config/initializers folder and create a file in there , you can call it what you want but I called it mongo.rb just so I know what its for. Then add the following code to the file 

config = Rails.configuration.database_configuration[Rails.env] defaults = { "host" => "localhost", "port" => 27017, "database" => config["database"] } mongo = config.fetch("mongo" , defaults) MongoMapper.connection = Mongo::Connection.new(mongo.fetch("host" , defaults["host"]) , mongo.fetch("port" , defaults["port"])) MongoMapper.database = mongo.fetch("database" , defaults["database"]) if mongo.fetch("username" , false) && mongo.fetch("password") MongoMapper.database.authenticate mongo["username"] , mongo["password"] end

Now all thats left is to create the models (see Mongomapper docs) and specs.

Please Note - This does not handle or setup relationships between mongo and data mapper , active record it is just how to get mongo in there.

As a footnote I thought I would insert this link to the Mongodb website that talks about how to set up rails to use just mongo mapper. http://www.mongodb.org/display/DOCS/Rails+3+-+Getting+Started. I feel that there is a bit missing for this tutorial because it hardcodes the mongo db options rather than using the database.yml. You can get at the data in the yml using the following 

Esse post é uma "continuação" do anterior, estarei demonstrando como fazer uma query no "like %" no MongoDb, utilizando a gem MongoMapper Como no post anterior, eu tenho o model "Person":

class Person include MongoMapper::Document key :name, String key :middle_initial, String end

E eu preciso encontrar todos os registros (no caso do Mongodb, documentos) que contenham o nome “Silva” em ‘name’, podendo ter vários Silva’s, como: “João da Silva”, “Maria Silva” e etc… A solução, mais uma vez, é simples: