Hi Kabrams,
Hope it helps.
pre
1 Change your favorite collection with following way:
1.1 delete userId and productId fields.
1.2 add field "user" with type pointer to user.
1.3 add field "product" with type pointer to product.
1.4 if you have some items in this collection - set fields "user" and "product" for these items.
1.5 add to your "list" service "include" request parameter and set value for this field "user,product"
1.6 use your "favorites" list service to create UI you need.
/pre
Please read more about "pointer" type here http://devcenter.appery.io/documentat...
Regards.