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Railsのモデルの扱い方

モデル作成

$ rails g model モデル名(小文字)

モデル削除

$ rails g model モデル名

マイグレーションファイルの編集のしかた

class Sample < ActiveRecord::Migration[5.2]
 def change
  create_table :sample do |t|
   #型            #カラム名
    t.string     :name 
    t.text       :text
    t.timestamps null: true
  end
 end
end

マイグレーションファイルの実行

$ rake db:migrate

データベースの状態を戻す

$ rake db:rollback
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