ActiveRecord::QueryCache::ClassMethods
Enable the query cache within the block if Active Record is configured. If it’s not, it will execute the given block. # File activerecord/lib/active_record/query_cache.rb, line 9 def cache(&block) if connected? || !configurations.empty? pool = connection_pool was_enabled = pool.query_cache_enabled begin pool.enable_query_cache(&block) ensure pool.clear_query_cache unless was_enabled end else yield
Keeping Data in Sync with ActiveRecord::UpdatedAt
Photo by Kayla KandzorraActiveRecord does not touch updated_at by default when calling: ActiveRecord::Base#update_columnActiveRecord::Base#update_columnsActiveRecord::Relation#update_allThis was causing some unexpected issues with caching and incremental ETL to external systems since our usage of updated_at to signify data modifications was inconsistent. We realized that we rarely ever have a reas
ActiveRecord::QueryMethods
Set.new([:where, :select, :group, :order, :lock, :limit, :offset, :joins, :left_outer_joins, :annotate, :includes, :eager_load, :preload, :from, :readonly, :having, :optimizer_hints, :with]) Returns a new relation, which is the logical intersection of this relation and the one passed as an argument. The two relations must be structurally compatible: they must be scoping the same model, and they mu
Is there a way to get a collection of all the Models in your Rails app?
Is there a way that you can get a collection of all of the Models in your Rails app? Basically, can I do the likes of: - Models.each do |model| puts model.class.name end
ActiveRecord::SecureToken::ClassMethods
# File activerecord/lib/active_record/secure_token.rb, line 61 def generate_unique_secure_token(length: MINIMUM_TOKEN_LENGTH) SecureRandom.base58(length) end Example using has_secure_token # Schema: User(token:string, auth_token:string) class User < ActiveRecord::Base has_secure_token has_secure_token :auth_token, length: 36 end user = User.new user.save user.token # => "pX27zsMN2ViQKta1bGfLmVJE"
Being Lazy with ActiveRecord
In programming language terms, “laziness” refers to code whose evaluation is delayed until the last possible moment. This strategy can have several benefits. For example: nums = (1..1_000_000).lazy squares = nums.map { |x| x * x } squares.take_while { |x| x < 100 }.to_a #=> [1, 4, 9, 16, 25, 36, 49, 64, 81]In this (contrived) example, since we're using a lazy enumerator, we never actually calculat
ActiveRecord::Validations
Active Record Validations Active Record includes the majority of its validations from ActiveModel::Validations. In Active Record, all validations are performed on save by default. Validations accept the :on argument to define the context where the validations are active. Active Record will pass either the context of :create or :update depending on whether the model is a new_record?.
Managing ActiveRecord connections with Octoshark
I wrote Octoshark a while ago but never really put any words about it on my blog. Now that I have been using it successfully in production for about a year handling millions of API requests per day and sending millions of emails per day for both GoDaddy Email Marketing and Mad Mimi, let’s do that. What is Octoshark? Octoshark is a simple ActiveRecord connection manager. It provides connection swit
Railsで複数テーブルに跨ってincludesする | blog.nomnel.net
例えばA has_many BsかつB has_one Cであるとき A.all.includes(bs: :c) とすればよい. さらにB has_many Dsであれば A.all.includes(bs: [:c, :ds]) となる.
ActiveRecordで行ロックをかける方法
行ロックとは 行ロックとは、テーブルの同一レコードに対して、複数同時に更新できないように制限する仕組みのことです。 Ruby on RailsのActiveRecordには２種類のロック方法があります。 楽観的ロック（Rails依存） 悲観的ロック（DBMS依存） それぞれの違いや使い方について解説していきたいと思います。 楽観的ロック 楽観的ロックとは、DBMSの機能に頼らずロックバージョンをレコードに保存しておくことで、取得時と変更時にロックバージョンに変更がないか確認し、変更があった場合は例外を発生させる方法です。 ロックするタイミング データ更新時 データを複数同時に取得することができるが、途中で更新されていた場合は、更新できない 仕組み テーブルにlock_versionフィールドを追加する lock_versionが書き換わっていたらActiveRecord::StaleObj
ActiveRecord::Enum (Ruby on Rails edge)
Declare an enum attribute where the values map to integers in the database, but can be queried by name. Example: class Conversation < ActiveRecord::Base enum :status, [ :active, :archived ] end # conversation.update! status: 0 conversation.active! conversation.active? # => true conversation.status # => "active" # conversation.update! status: 1 conversation.archived! conversation.archived? # => tru
Rails 5.0.0.1, 4.2.7.1, and 3.2.22.3 have been released!
Rails 5.0.0.1, 4.2.7.1, and 3.2.22.3 have been released! Hi everyone! Rails 5.0.0.1, 4.2.7.1, and 3.2.22.3 have been released! These release contain important security fixes, so please upgrade when you can. Versions 5.0.0.1, 4.2.7.1, and 3.2.22.3 contain a fix for CVE-2016-6316 which you can read about here. Version 4.2.7.1 also contains CVE-2016-6317 which you can read about here. To ease upgradi
ActiveRecord::Attributes::ClassMethods (Ruby on Rails edge)
Defines an attribute with a type on this model. It will override the type of existing attributes if needed. This allows control over how values are converted to and from SQL when assigned to a model. It also changes the behavior of values passed to ActiveRecord::Base.where. This will let you use your domain objects across much of Active Record, without having to rely on implementation details or m
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ActiveRecord::Relation (Ruby on Rails edge)
added support for MSSQL2016 by udaykadaboina · Pull Request #514 · rails-sqlserver/activerecord-sqlserver-adapter
GitHub - tsuwatch/fake_associations: Enables association DSL in classes that don't inherit from ActiveRecord.
GitHub - waterlink/active_record.cr: Active Record pattern implementation for Crystal.
Introducing: BabySqueel
GitHub - dalibor/octoshark: Octoshark is an ActiveRecord connection manager
Railsで複数テーブルのjoins/includesとwhere検索
