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Is there any Django function which will let me get an object form the database, or None if nothing matches?
Right now I'm using something like:
foo = Foo.objects.filter(bar=baz) foo = len(foo) > 0 and foo.get() or None But that's not very clear, and it's messy to have everywhere.
972
Creating objects To create an object, instantiate it using keyword arguments to the model class, then call save() to save it to the database. This performs an INSERT SQL statement behind the scenes. Django doesn't hit the database until you explicitly call save() . The save() method has no return value.
ObjectDoesNotExist and DoesNotExistDjango provides a DoesNotExist exception as an attribute of each model class to identify the class of object that could not be found and to allow you to catch a particular model class with try/except .
There are two ways to do this;
try: foo = Foo.objects.get(bar=baz) except model.DoesNotExist: foo = None Or you can use a wrapper:
def get_or_none(model, *args, **kwargs): try: return model.objects.get(*args, **kwargs) except model.DoesNotExist: return None Call it like this
foo = get_or_none(Foo, baz=bar) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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