Resource lists

group_firstchar: Group a list of sorted resource ids on their first letter of the title or another rsc property. After grouping, it splits this list in a number of more-or-less…
group_title_firstchar: Similar to group_firstchar, but always uses the title column from the rsc table.
is_visible: Filter a list of resource ids so that only the visible ids remain.
is_a: Filter a list of resource ids on category, or test if a single resource id belongs to a category.
is_not_a: is_not_a mirrors is_a. It is particularly useful when iterating over a category and excluding members of a sub-category (iterating over all images associated…
media_for_language: Filter a list of media items by their medium_language property, return the best matching with the current or given language. Only visible media items are…