bump On 09/28/2011 12:52 AM, Jonas H. wrote:
Hallöchen,some non-relational databases (e.g. MongoDB) have support for arbitrarily nested objects. To make queries that "reach" into these sub-objects, the Django-nonrel developers find it appealing to use JOIN syntax. For instance, if you had this person in your database {'name': 'Bob', 'address': {'city': 'NY', 'street': 'Wall Street 42'}} you could find Bob using these queries: Person.objects.filter(name='Bob') Person.objects.filter(address__city='NY') Person.objects.filter(address__street__startswith='Wall') ... Similarly, sub-objects may be stored in a list, like so: { 'votes': [ {'voter': 'Bob', 'vote': 42}, {'voter': 'Ann', 'vote': 3.14}} ] } Vote.objects.filter(votes__vote__gt=2) ... These sub-object queries are essential for non-relational databases to be really useful so this is an important feature. What's the core team's opinion on this topic -- is there any chance to get something like that into Django at all? (Maybe you think two meanings for one syntax cause too much confusion) Secondly, how could this be implemented? I thought about refactoring JOIN syntax handling into the model fields (as little logic as required; refactoring the actual hardcore JOIN generation code seems like an impossible task for anyone but the original author)... any other ideas? So far, Jonas
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