module ViewModel::MigratableView

def migrates(from:, to:, inherit: nil, at: nil, &block)
  @migrations_lock.synchronize do
    migration_superclass =
      if inherit
        raise ArgumentError.new('Must provide inherit version') unless at
        inherit.migration_class(at - 1, at)
      else
        ViewModel::Migration
      end
    builder = ViewModel::Migration::Builder.new(migration_superclass)
    builder.instance_exec(&block)
    migration_class = builder.build!
    const_set(:"Migration_#{from}_To_#{to}", migration_class)
    @migration_classes[[from, to]] = migration_class
    @realized_migration_paths = false
  end
end