On Aug 12, 2:24 am, Andy <selforgani...@gmail.com> wrote:
> When I create an object in Django, how long does it live?
>
> When Django finishes responding to a HTTP request, the Python process
> lives on to serve the next request. Does that mean all those objects
> that were created would continue to hang around?
It depends where they were created, and whether any references exist
outside that scope. Anything created within a view function, for
example, that never gets referenced at a higher scope, will go out of
scope when the view returns, and will therefore be deleted. If however
you put a reference to that object in the module-level scope, then the
object will persist. This can sometimes be an easy way to cache
objects that you will need on every request:
my_cache = {}
def my_view(request, object_id):
obj = MyModel.objects.get(pk=object_id)
my_cache[object_id] = obj
return render_to_response('template.html', {'obj':obj})
In this case obj will persist across requests, because it is
referenced within my_cache. If you didn't do that assignment, it would
automatically be deleted when its only reference, the local 'obj'
variable, goes out of scope.
This is of course standard Python scoping rules - nothing particular
to Django here.
--
DR.
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