ephemeral ActiveRecord model for specs

spec.rb

  let(:model_class) do
    Class.new(ApplicationRecord) do
      self.table_name = "model_class_#{SecureRandom.uuid.delete('-')}"

      def self.up
        connection.execute("CREATE TABLE #{table_name}(id INTEGER PRIMARY KEY AUTOINCREMENT)")
      end

      def self.down
        ApplicationRecord.connection.execute("DROP TABLE #{table_name}")
      end
    end
  end

  around do |example|
    model_class.up
    example.run
    model_class.down
  end