module Rails::Generators::Migration

def set_migration_assigns!(destination)
  destination = File.expand_path(destination, destination_root)
  migration_dir = File.dirname(destination)
  @migration_number     = self.class.next_migration_number(migration_dir)
  @migration_file_name  = File.basename(destination, ".rb")
  @migration_class_name = @migration_file_name.camelize
end