Is it possible to create a filterer like in the demo pad videos, but not to be assigned to a finder, want to use it more on a select statement.
Would be great to get an example for that.
Not really, the filterer system is built around finders. Unless you have a good reason to use plain queries, it's generally preferable to work with finders/entities anyway.
Thanks for your answer @Jeremy P
If I find a way to use the finder to get all threads with specific attachments and the corresponding attachment information I would change it.