Hi all,
On Tue, 17 Dec 2013, Tom Evans wrote:
On Tue, Dec 17, 2013 at 3:35 PM, parisrocks
<saravanan.sellathu...@gmail.com> wrote:
Waiting for official Django ORM support for NoSql databases.
MongoDB (and the vast majority of NoSQL databases) are not relational
databases, they are document oriented databases, they store documents of
an unspecified type and allow you to retrieve documents by id, or
perhaps other attributes of the document.
At no point with MongoDB can you have relationships between two
different documents that can be followed or queried. Therefore, I'm
quite confused what you want from an "ORM" interface to a NoSQL
database. Each document has no relationships, there is nothing for an
"ORM" to do...
I think it would be more helpful to say that it IS possible to store the
ID of a document in a field of another, of course, and that means that
documents CAN have relationships:
{"id": "1", "name": "Pluto", "owner": "2"}
{"id": "2", "name": "Mickey"}
And some NoSQL databases do not provide any facilities for following that
link automatically, as part of a single query, so you would need to make a
separate query to retrieve the owner of an object. Other databases (such
as CouchDB) do support it.
Even SQL does not always make it easy or convenient to follow these links,
especially if one wants to retrieve associated records from multiple
tables without creating a combinatorial explosion. NoSQL databases can
actually do better than SQL here.
There is value in providing storage backends for NoSQL databases in
Django. Several already exist, for example:
* https://code.djangoproject.com/wiki/NoSqlSupport
* http://www.allbuttonspressed.com/projects/django-nonrel
The main issues and solutions are listed on the first of those pages.
There is no particular reason NOT to do it, unless one wants Django's ORM
layer to remain fundamentally tied to SQL. I can't see a good reason to do
that, but maybe others do. In the mean time, this question will continue
to be asked until a position is officially documented, even if it's "we
don't care about NoSQL, just leave us alone."
Cheers, Chris.
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