Menu
How can I retrieve the last record in a certain queryset?
537
You need to specify a field in latest(). eg. Or if your model's Meta specifies get_latest_by, you can leave off the field_name argument to earliest() or latest() . Django will use the field specified in get_latest_by by default.
Yes, you can reuse existing querysets. This is not really making anything faster though, in fact, this code block won't even execute a query against the database because Django QuerySets are lazily evaluated. What I means is that it won't send the query to the database until you actually need the values.
In my last Django project, we had a set of helper functions that we used a lot. The most used was helpers. first, which takes a query set and returns the first element, or None if the query set was empty. Instead of writing this: try: object = MyModel.objects.get(key=value) except model.DoesNotExist: object = None.
Django Doc:
latest(field_name=None)returns the latest object in the table, by date, using the field_name provided as the date field.This example returns the latest Entry in the table, according to the
pub_datefield:Entry.objects.latest('pub_date')
97
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
