[chaley]

I don't know where the attribute 'cache_api" is defined. Is it something you made?

In any event, here is a calibre python template that returns all the current series names.

python:
python:
def evaluate(book, context):
	series_names = context.db.new_api.all_field_names('series')
	return ', '.join(series_names)

Going from your example, I would use

	series_names = self.db.new_api.all_field_names('series')

But if you are looking for all the books for a given series then

	series_id = context.db.new_api.get_item_id('series', 'Bah')
	# should check for None
	series_books = context.db.new_api.books_for_field('series', series_id)