djapian based search returns no result

Answer 1

It's possible that all you are missing is running

Profile.indexer.update()

at the end of models.py (you only have to do this once).

Now, I might be using an older version of Djapian than you but the following seem to work for me (end of models.py):

profile_indexer = djapian.Indexer(
    model=Profile,
    fields=[..., ...],
    tags=[(..., ...), (..., ...)]
)
# Run once and then comment out.
Profile.indexer.update()