A little background: my application is used to manage observational data 
which is collected from designated routes annually. Each route object has a 
set of observation events which in turn have a date field. The data is 
managed by using a (terrible) customized Django admin interface.

In the admin interface list view it's possible to search routes using a 
custom search box which just injects parameters like ?route_no=1234 and so 
forth into the url resulting in a filtered list view. For the most part 
this works but when I want to search for routes that, for example, have 
observation events past certain date with a query like 
?observationevent__observation_date__gte=2010-01-01 (supposed to show all 
routes that have been observed this decade) it raises an DatabaseError: 
ORA-00932: inconsistent datatypes: expected - got NCLOB-exception while 
using an Oracle database in production. The query seems to work when using 
a development SQLite database or doing a query like 
Route.objects.filter(observationevent__observation_date__gte='2012-01-01') 
directly in the management console even when using the Oracle production 
database.

According to the general notes on databases the Oracle backend has 
limitations with TextField-related queries (
https://docs.djangoproject.com/en/dev/ref/databases/#textfield-limitations) 
and this seems to be causing this as far as I can tell. As the queries are 
created by Django admin I have no idea how I should proceed from here. Is 
there some kind of easy way to prevent this from happening on Oracle or 
should I implement some kind of manual search function?

I am currently using the following versions:
Django==1.4.5
cx-Oracle==5.1.2
gunicorn==0.17.2
virtualenv==1.5.1

My apologies in advance if this has been answered before or I am not 
posting this in a proper way as this is my first post here. :)

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