[chaley]

Originally Posted by ownedbycats

Well, unless the field (series_index) isn't available for editing with the SFE.

This stored template sets the series index to whatever the argument is:

python:
def evaluate(book, context):
	args = context.arguments
	if args is None or len(args) != 1:
		return 'Invalid arguments'
	try:
		sidx = float(args[0])
	except:
		return 'Bad series index'
	db = context.db
	from calibre.gui2.ui import get_gui
	gui = get_gui()

	bids = gui.current_view().get_selected_ids()
	results = []
	for bid in bids:
		db.set_series_index(bid, sidx)
		results.append(db.title(bid, index_is_id=True))
	db.refresh_ids(bids)
	gui.current_view().model().refresh_ids(bids)
	return 'Done: ' + ', '.join(results)

You call it by selecting books and running this template in the template tester:

program: change_series_index(0)

where the 0 is whatever you want.

You can also use it in an Action Chains formula action.

You can't use it in bulk edit search & replace.