Can you merge querysets or objects?

[Stephen McCamy]

Hello,  I am trying to figure out a way to combined data from two collections into one object I can reference in code. I have manually created a dictionary and just added the data to it.  This works but I want to see if there is a better way.  End goal is the have a many to many type relationship where I can show the item groups that an item belongs to as well as the items that belong to an item group.  I don't know if a lookup would accomplish this or if there is a better way to approach it on the collection end?

class Items(Document):
    item = StringField(required=True)
    tags = ListField()


class ItemGroups(Document):
    name = StringField(required=True)
    items = ListField(ReferenceField(Items, reverse_delete_rule=PULL))

 
item = Items.objects(item="item1").first()
itemgroups = ItemGroups.objects(items=item).all()


if item:
    if itemgroups:
        groupslist = []
        for group in itemgroups:
            groupslist.append(group.name)
        item_dict = item.to_mongo().to_dict()
        item_dict.update({"item_groups": groupslist})