Ruby on Rails Guides: Migrations
Migrations are a convenient way for you to alter your database in a structured and organized manner. You could edit fragments of SQL by hand but you would then be responsible for telling other developers that they need to go and run them. You’d also have to keep track of which changes need to be run against the production machines next time you deploy. Active Record tracks which migrations have al
Data Migrations in Rails
Every now and again we need to change actual data in the production database. The first obvious option that comes to mind is to use a Rails migration, especially since the word “migration” is already in the task at hand, a “data migration.” But let’s talk about it some more and let me try to dissuade you from doing so. Looking the at Rails Guides for Active Records Migration, the first section sta
Railsでカラムを追加する際にreferencesを指定するとdb:migrateが通らない | blog.nomnel.net
[2014/07/03追記] Rails4.0以上ならadd_reference使えばOK. [追記終わり] Stack Overflowに全く同じ状態の投稿があったのでその通りにして解決. 一応こちらにも書いておく. 現象 次のようにreferencesを指定してmigrationファイルを生成したとき, rails g migration AddUserCategoryToUsers user_category:references class AddUserCategoryToUsers < ActiveRecord::Migration def change add_column :users, :user_category, :references, :default => 1 end end db:migrateに失敗する. rake db:migrate == AddUser
Rails3.2 の migration で「id」を autoincrement でなくする設定メモ | JAM☆ぱん
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