Django QuerySet

Introduction

Django is a Python web framework that provides a high-level ORM (Object-Relational Mapping) system for interacting with databases. QuerySet is a powerful feature of Django's ORM that allows you to retrieve, manipulate, and filter data from the database.

In this article, we will discuss the Django QuerySet's last() and order_by() methods to retrieve the last 10 records from a database table.

QuerySet.last()

The last() method returns the last object from the QuerySet, based on the ordering defined for the model. By default, the ordering is determined by the model's Meta.ordering attribute or the primary key field.

To get the last 10 records from a model, you can combine the last() method with the order_by() method.

QuerySet.order_by()

The order_by() method is used to specify the field(s) by which the QuerySet should be ordered. It can be called with one or more fields to define the ordering. By default, the ordering is ascending (i.e., from the lowest value to the highest). To specify descending ordering, you can prefix the field name with a hyphen (-).

Retrieving the Last 10 Records

To retrieve the last 10 records from a model, you can use the following code:

last_10_records = MyModel.objects.order_by('-id')[:10]

In this example, we assume that MyModel is the model you want to query. We specify the ordering by the id field in descending order using -id. Then, we use slicing [:10] to limit the result to the last 10 records.

Make sure to replace MyModel with the actual name of your model.

Conclusion

Using the last() and order_by() methods of Django QuerySet, you can easily retrieve the last 10 records from a database table. This provides a convenient way to fetch and display the most recent data entries.

Remember to adapt the code to your specific situation, such as replacing MyModel with your own model name.