[chaley]

Here is an example that uses the current VL

python:

def ids_for_field(db, ids_of_books, field_name):
	# First get all the names for the desired books.
	# Use a set to make them unique
	unique_names = set()
	for tup in db.all_field_for(field_name, ids_of_books).values():
		for val in tup:
			unique_names.add(val)
	# Now get the ids for the names and build the pairs
	id_field_pairs = list()
	for name in unique_names:
		id_field_pairs.append((db.get_item_id(field_name, name), name))
	return id_field_pairs

def evaluate(book, context):
	print('--------------------')
	# Get the list of books in the current VL
	ids_in_vl = context.db.data.search_getting_ids('', '', use_virtual_library=True)
	# Get the id,val pairs for the desired field
	field_pairs = ids_for_field(context.db.new_api, ids_in_vl, 'authors')
	print(field_pairs) 
	return ''