@yoav-wix , sorry but have you even read the content of my post and the point I made below when answering to @marlowe-shaeffer ? @marlowe-shaeffer this is not an answer to my question, so it’s not a ‘best answer’.
“Can you share more details as to what you are trying to solve? I mean, in terms of the outcome you expect” - Sure, please read what I described…
“With Wix Data, we have 3 (or even 4) different options” - I know that, as you can see I opt for nested objects in Collection_2. Also as you can read in my reply to @marlowe-shaeffer I don’t now how to use multi references from code to achieve the outcome I want ( see above for the expected outcome)
For the record, you say: “with nested objects like the above, you can do all kind of operations, like filter on the child objects” - unfortunately that doesn’t work if you want to access specific indices of an array, so you’ll need to query the entire object to do the filtering on the level of the application layer using .filter(function () {});