migration_template (source, destination=nil, config={})
public
Creates a migration template at the given destination. The difference to
the default template method is that the migration version is appended to
the destination file name.
The migration version, migration file name, migration class name are
available as instance variables in the template to be rendered.
migration_template " migration.rb ", " db/migrate/add_foo_to_bar.rb " Show source # File railties/lib/rails/generators/migration.rb, line 41
def migration_template(source, destination=nil, config={})
destination = File.expand_path(destination || source, self.destination_root)
migration_dir = File.dirname(destination)
@migration_number = self.class.next_migration_number(migration_dir)
@migration_file_name = File.basename(destination).sub(/\.rb$/, '')
@migration_class_name = @migration_file_name.camelize
destination = self.class.migration_exists?(migration_dir, @migration_file_name)
if !(destination && options[:skip]) && behavior == :invoke
if destination && options.force?
remove_file(destination)
elsif destination
raise Error, "Another migration is already named #{@migration_file_name}: #{destination}. Use --force to remove the old migration file and replace it."
end
destination = File.join(migration_dir, "#{@migration_number}_#{@migration_file_name}.rb")
end
template(source, destination, config)
end