-class AddEmailValid < ActiveRecord::Migration
+class AddEmailValid < ActiveRecord::Migration[5.0]
def self.up
add_column "users", "email_valid", :boolean, :default => false, :null => false
User.update_all("email_valid = (active != 0)") # email_valid is :boolean, but active is :integer. "email_valid = active" (see r11802 or earlier) will fail for stricter dbs than mysql