実録！Railsのはまりポイント10選

ちなみにRails本体は• Contributing to Ruby on Rails• 5.3 Follow the Coding Conventionsには • Prefer &&/¦¦ over and/or• と書かれている• http://guides.rubyonrails.org/ contributing_to_ruby_on_rails.html Copyright © Drecom Co., Ltd.

lambdaを渡すscope :started, lambda { where(start_at<= ?, Time.now) } • lambdaの中身は都度評価される • edgeではwhereを直接書くやり方は deprecatedとなった • https://github.com/rails/rails/commit/ 0a12a5f8169685915cbb7bf4d0a7bb48 2f7f2fd2 Copyright © Drecom Co., Ltd.

パッチmodule ActiveRecord module ConnectionAdapters module SchemaStatements def index_name(table_name, options) if Hash === options if options[:column] "#{Array.wrap(options[:column]) * _and_}" elsif options[:name] options[:name] else raise ArgumentError, "You must specify the index name" end else index_name(table_name, :column => options) end end end endend Copyright © Drecom Co., Ltd.

コード例CREATE TABLE IF NOT EXISTStmp_scores LIKE scores;TRUNCATE TABLE tmp_scores;class TmpScore < ActiveRecord::Base; endTmpScore.import([:user_id, :value, :rank],scores)RENAME TABLE scores TO scores_old,tmp_scores TO scores;DROP TABLE scores_old; Copyright © Drecom Co., Ltd.

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実録！Railsのはまりポイント10選

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