Hi,

I need to make a json file from a collection.

This collection must consist of companies who do not have a certain type of attachment. 

So, my idea was to first make a collection of all the companies that have this attachment, and then make a new collection of all the companies that are not in the previous collection.

But as the IN statement exists in the filter of a collection, the NOT IN statement doest not exist. 

So, how do I filter my collection based on not existing in the other collection?

Corné