try… except… returns an exception if a record isn't found

Question

class Model1(models.Model):

    def method1(self):
        try:
            x = self.someotherclass_set.get(....)
        except self.DoesNotExist:
            return None 

        return x

And then a filter:

@register.filter
def filter1(arg1):
    x = var1. method1()
    if x:
        return x.value
    else:
        return 'Nothing'

And a view:

some data: {{ item|filter1 }}

And yet the yellow screen and the error DoesNotExist is being throw. How can I get rid of it? I just want to show "Nothing" if there's no record.

Answer 1

Use the first() method instead of the try / except block:

def method1(self):
    return self.someotherclass_set.filter(....).first()

BTW, you can also simplify the template filter:

@register.filter
def filter1(arg1):
    x = arg1.method1()
    return x.value if x else 'Nothing'

UPDATE : If you really want to use exceptions then change the exception to valid one:

except Model1.DoesNotExist: