class AddSessions < ActiveRecord::Migration[4.2] def self.up create_table :sessions, options: "ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci" do |t| t.column :session_id, :string t.column :data, :text t.column :updated_at, :datetime end add_index :sessions, :session_id add_index :sessions, :updated_at end def self.down drop_table :sessions end end