[chaley]

Originally Posted by Comfy.n

Hi @chaley,

Could you please create a similar template to search for each author that has a Link and return only one book per author?

stored template: item_has_links.


The template:

Spoiler:

python:
def evaluate(book, context):
	field_name = context.arguments[0] if len(context.arguments) == 1 else None
	if field_name is None:
		raise NameError("The argument for the field name wasn't provided")

	db = context.db.new_api
	items_with_links = context.globals.get('items_with_links')
	if items_with_links is None:
		items_with_links = db.get_link_map(field_name)
		context.globals['items_with_links'] = items_with_links

	vals = book.get(field_name)
	if vals is None:
		return ''
	if isinstance(vals, str):
		vals = tuple((vals,))
	for val in vals:
		if val in items_with_links:
			return '1'
	return ''

The documentation:

Spoiler:

Return ``True`` if any ``item`` in the ``field`` named by ``field_name``, the argument to the template, has a link.

Saved search "author_has_links:

Spoiler:

template:"""program: item_has_links('authors')#@#:b:yes"""

Search to show one book per author that has links:

Spoiler:

search:"=author_has_links" and search:"=one_book_per_author"

This attachment is an importable copy. Import of stored templates is available in calibre source as of 18 Dec 2024, and release 7.23.