You might be using joins in one or more of your MongoDB model declarations.
Check with the Meta section of the Mongo models.
Infact, if you are trying to span across collections in your non-relational
database on purpose, then something basic might be going wrong.
On Fri, Feb 10, 2012 at 9:32 AM, Subhodip Biswas
<subhodipbis...@gmail.com>wrote:
> Hi all,
>
> I am trying to use two database for my django(Django nonrel 1.3.1)
> project. One is Postgres and other is MongoDB.
> After filling in details in settings.py :
>
> DATABASES = {
> 'default': {
> 'ENGINE': 'django_mongodb_engine', # Add
> 'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' or 'oracle'.
> 'NAME': 'Mongo_MSTR', # Or path to
> database file if using sqlite3.
> 'USER': '', # Not used with sqlite3.
> 'PASSWORD': '', # Not used with sqlite3.
> 'HOST': '', # Set to empty string for
> localhost. Not used with sqlite3.
> 'PORT': '', # Set to empty string for
> default. Not used with sqlite3.
> },
> 'geodata': {
> 'ENGINE': 'django.contrib.gis.db.backends.postgis', # Add
> 'postgresql_psycopg2', 'postgresql', 'mysql', 'sqlite3' or 'oracle'.
> 'NAME': 'mydatabase', # Or path to
> database file if using sqlite3.
> 'USER': 'Username', # Not used with sqlite3.
> 'PASSWORD': 'Password', # Not used with sqlite3.
> 'HOST': '', # Set to empty string for
> localhost. Not used with sqlite3.
> 'PORT': '', # Set to empty string for
> default. Not used with sqlite3.
>
> }
> }
>
> Now if I am doing a
> $ Python manage.py syncdb --database=geodata
>
> I am getting a error like this :
> django.db.utils.DatabaseError: Ordering can't span tables on
> non-relational backends
>
> If however I am executing the above without postgres service started,
> I will get a error related to Postgres.
> If I am explicitly mentioning the RDMS why is it throwing me error
> based on MongoDB?
>
> What am I missing here? Any pointers or documents will be of great help.
>
>
> -------------
> Regards
> Subhodip Biswas
>
>
> GPG key : FAEA34AB
> Server : pgp.mit.edu
> http://subhodipbiswas.wordpress.com
>
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>
--
Thanks,
Subhranath Chunder.
www.subhranath.com
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