Updating to PHP 8.1, I found this interesting code stop... Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in bales_preprocess() (line 162 of /var/www/{path/to/file}) What is trim(). Very simply, it removes whitespaces (if they exist) at the start or end of a string.

I had the issue where I needed to filter an array list by a specific column.  In my instance, the column is language.  To be able to reduce the query to the language column the code required is levels = selectedCategory?.levels.filter("language = %@", language)Language can be any string, in this instance for me language is a two alpha character such as 'fr', 'en' or 'de'. Further to this you can continue to chain this query through including sort as per levels =...