inner filter

[drorsun]

Hi,
not sure if I am doing this correctly - trying to filter a join query with user fullName.
I have this query that works well (returns a result set)

sharedSong.Query.all().select_related("user").filter(cloudId__exists=True).filter(deletionDate__exists=False).filter(user__exists=True).order_by("-createdAt")

Playing with it for while I am pretty sure that the "user" is recognised.

However I need another filter - to get only users that have a fullName.
So I used the same query with the filter addition of 'user__fullName__exists=True' but I get zero results:

sharedSong.Query.all().select_related("user").filter(cloudId__exists=True).filter(deletionDate__exists=False).filter(hasUploadedVideo=True).filter(user__exists=True).filter(user__fullName__exists=True).order_by("-createdAt")

Is this a bug or am I using this incorrectly?