As stated in one of the answers in this question and in the codex entry for the
request filter, said filter gets called only in a default query, such as the main query used for a loop. My question is, what else is or isn’t considered a default query? Would creating a new
WP_Query object be considered such?
The “default” query is the one WordPress does itself, based on the URL and such, automatically.
Any query you create manually, via a new WP_Query or by calling query_posts(), will not use the ‘request’ filter.
There is only one “default” query, and you cannot trigger it via any code in the template.
request is only applied once, by
parse_request(), a method of the
WP class. There is only one reference to this, it is by another method of
main() is referenced one time, by
wp() is referenced in a few different contexts by a number of different functions and files:
wp_edit_attachments_query(). So, looking through that, nothing that `WP_Query calls is listed.
Short answer: I’d say no, it does not call
All that said, my work is based on working backwards with phpxref (hence the links), so I may have missed something, or it may have missed something. A better way to ask your question might be to ask on what you’re trying to do, not on your implementation of it.
Just a note:
main() does call
query_posts(), which (I think) does the default query and such, but an instance of WP_Query alone shouldn’t be enough to trigger this from what I’ve seen.