How to use variables for models in get_object_or_404 or objects.get

Question

In Django, how do I use variables to dynamically use the get_object_or_404 or objects.get like

get_object_or_404(${Variable}, pk=id)

or

${Variable}.objects.get(pk=id)

Python is not PHP. Exactly what is "Variable"? Where's it coming from? — Daniel Roseman
– Daniel Roseman, Commented Apr 12, 2013 at 19:41
Variable is just contain a string for the name of the model, so if Variable="ModelA", how can I access ModelA? — kli
– kli, Commented Apr 12, 2013 at 19:59
Actually I am trying to ask the same question as stackoverflow.com/questions/12279846/… — kli
– kli, Commented Apr 12, 2013 at 20:08

user1802310 · Accepted Answer · 2013-04-12 20:13:45Z

0

If you assure to pass a Django ORM Model Class in the parameter, get_object_or_404() will work just fine.

def do_something(id,MyDjangoModelObject = None)
    if MyDjangoModelObject:
        get_object_or_404(MyDjangoModelObject, pk=id)

also

MyDjangoModelObject.objects.get(pk=id)

answered Apr 12, 2013 at 19:52

user1802310

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Comments

MostafaR · Accepted Answer · 2013-04-12 20:15:03Z

0

No problem, assume that you have two models Post and Comment, You can have this:

from app import models as app_models

dynamic_object = getattr(app_models, 'post')

So you can use it:

dynamic_object.objects.get(pk=id)

or

get_object_or_404(dynamic_object, pk=id)

answered Apr 12, 2013 at 19:44

MostafaR

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what if i have like 30 models? If there any way to get objects by name or from string?