Active Record Query Interface — Ruby on Rails Guides

This guide covers different ways to retrieve data from the database using Active Record. After reading this guide, you will know: How to find records using a variety of methods and conditions. How to specify the order, retrieved attributes, grouping, and other properties of the found records. How to use eager loading to reduce the number of database queries needed for data retrieval. How to use dy

[tvsk]

Rails の ActiveRecord API の利用ガイド。さまざまな ER設計を想定した記述

[kiyo_hiko]

"All scope methods will return an ActiveRecord::Relation object which will allow for further methods (such as other scopes) to be called on it."

[crist18]

“EXPLAIN”

[Kureduki_Maari]

.｡oO(ActiveRecordは、N + 1 queriesの為に、明示してincludesが必要なのな (

[JunichiIto]

毎回ググってサンプル探してくるんじゃなくて、ちゃんと体系的に理解しておかないと！

[duidui]

active record