概要
古いハッシュ形式のダイナミックファインダの廃止
内容
Rails4では古いハッシュ形式のダイナミックファインダの廃止になりました。
旧形式
Model.find_by_name "input_name" Model.find_all_by_name "input_name" Model.find(: all) "input_name"
推奨形式
Model.find_by name: value Model.where name: value Model.all
サンプル
前提DB
mysql> desc books; +------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------+--------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(255) | YES | | NULL | | | isbn | varchar(255) | YES | | NULL | | | price | int(11) | YES | | NULL | | | created_at | datetime | YES | | NULL | | | updated_at | datetime | YES | | NULL | | +------------+--------------+------+-----+---------+----------------+ 6 rows in set (0.00 sec) mysql> select * from books; +----+----------------------------------------------------------------+----------------+-------+---------------------+---------------------+ | id | name | isbn | price | created_at | updated_at | +----+----------------------------------------------------------------+----------------+-------+---------------------+---------------------+ | 1 | RailsによるアジャイルWebアプリケーション開発 | 978-4274068669 | 3200 | 2013-07-09 15:08:46 | 2013-07-09 15:08:46 | | 2 | メタプログラミングRuby | 978-4048687157 | 2800 | 2013-07-09 15:08:46 | 2013-07-09 15:08:46 | | 3 | 入門bash | 978-4873112541 | 2800 | 2013-07-11 13:49:15 | 2013-07-11 13:49:15 | +----+----------------------------------------------------------------+----------------+-------+---------------------+---------------------+ 3 rows in set (0.00 sec)
推奨形式でデータ取得
User.find_by price: 2800 User.where price: 2800 User.all
Controllerの生成
$ bundle exec spring rake g controller sample show
controller
class SampleController < ApplicationController def show @find_by_book = Book.find_by price: 2800 @find_all_by_book = Book.where price: 2800 @all_book = Book.all end end
view
%h1 Sample#show %p Find me in app/views/sample/show.html.haml %hr/ Book.find_by_book %table %tr %th id %th name %th isbn %th price %th created_at %th updated_at %tr = content_tag :td, @find_by_book.id = content_tag :td, @find_by_book.name = content_tag :td, @find_by_book.isbn = content_tag :td, @find_by_book.price = content_tag :td, show_dat(@find_by_book.created_at) = content_tag :td, show_at(@find_by_book.updated_at) %hr/ Book.find_all_by_book %table %tr %th id %th name %th isbn %th price %th created_at %th updated_at -@find_all_by_book.each do |b| %tr = content_tag :td, b.id = content_tag :td, b.name = content_tag :td, b.isbn = content_tag :td, b.price = content_tag :td, show_dat(b.created_at) = content_tag :td, show_at(b.updated_at) %hr/ Book.all %table %tr %th id %th name %th isbn %th price %th created_at %th updated_at -@all_book.each do |b| %tr = content_tag :td, b.id = content_tag :td, b.name = content_tag :td, b.isbn = content_tag :td, b.price = content_tag :td, show_dat(b.created_at) = content_tag :td, show_at(b.updated_at)
結果
