> TableName.objects.filter(fieldname_gt, val)
I think you mean
TableName.objects.filter(fieldname_gt=val)
> But i want to be able to do the following:
>
> TableName.objects.filter(fieldname + "__gt", val)
Here's where Python's keyword/dictionary expansion[1] becomes
helpful:
params = {fieldname + "__gt": val}
TableName.objects.filter(**params)
(yes, this can be done in-line, but it's not as readable:
TableName.objects.filter(**{
fieldname + "__gt": val})
so I recommend against it). This is particularly helpful in
looping/searching:
searchstring = 'django'
fields = ['field1', 'field2', 'field3']
qs = MyModel.objects.all()
for fieldname in fields:
params = {
fieldname + "__icontains": searchstring
}
qs = qs.filter(**params)
This code is marvelously maleable and can solve a number of "do
some similar operation across a number of fields with minimal fuss".
-tim
[1] References at
http://www.network-theory.co.uk/docs/pytut/KeywordArguments.html
http://docs.python.org/ref/calls.html
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