How do I sort data in Django?

Django QuerySet Order By

1. Order By. To sort QuerySets, Django uses the order_by() method:
2. Descending Order. By default, the result is sorted ascending (the lowest value first), to change the direction to descending (the highest value first), use the minus sign (NOT), – in front of the field name:
3. Multiple Order Bys.

How do I show data in ascending order in Django?

Django has order_by method to sort the queryset in ascending and descending order. You can order the queryset on any field. In the Django model, there is one autogenerated ‘id’ field. You can use any of the fields (id name, mobile or name) to sort the queryset.

How does order_by work in Django?

If I understand correctly, I think you need consistently ordered result set every time, You can use something like order_by(‘score’,’id’) that will first order by the score first and then by the auto-increment id within the score having same values, hence your output being consistent. The documentation is here.

What is Get_queryset in Django?

get_queryset() Used by ListView s – it determines the list of objects that you want to display. By default, it will just give you all for the model you specify. By overriding this method you can extend or completely replace this logic. Django documentation on the subject.

What is the difference between aggregate and annotate Django?

Aggregate calculates values for the entire queryset. Annotate calculates summary values for each item in the queryset.

What is the difference between GET and filter in Django?

The Difference between Django’s filter() and get() methods are: get throws an error if there’s no object matching the query. filter will return an empty queryset… Basically use get() when you want to get a single unique object, and filter() when you want to get all objects that match your lookup parameters.

What is difference between APIView and ViewSet?

APIView is the base class based view. Viewsets have APIView as a parent class. With Viewsets, you code more specific methods . For example the ‘retrieve’ method, will expect arguments of the request and the pk of the object to be retrieved.

What is difference between APIView and GenericAPIView?

APIView is a base class. It doesn’t assume much and will allow you to plug pretty much anything to it. GenericAPIView is meant to work with Django’s Models. It doesn’t assume much beyond all the bells and whistles the Model introspection can provide.

Why we use annotate in Django?

The Django ORM is a convenient way to extract data from the database, and the annotate() clause that you can use with QuerySets is also a useful way to dynamically generate additional data for each object when the data is being extracted.