Скачать или смотреть Django Trick: Creating Custom Model Field Lookups with RegisterLookup

ntroduction:

Django's ORM is powerful, offering a wide range of field lookups like __exact, __icontains, and __gte. But did you know you can create your own custom field lookups? By using RegisterLookup, you can extend Django's ORM to support custom query expressions, allowing for more expressive and efficient queries tailored to your application's needs.

How It Works:

Custom lookups are created by defining a new class that inherits from django.db.models.Lookup or django.db.models.Transform, and then registering it with a model field. This allows you to use your custom lookup in queryset filters just like any built-in lookup.

Why It's Cool:

Creating custom lookups enhances the expressiveness of your queries and keeps your code DRY (Don't Repeat Yourself). Instead of filtering data in Python code after retrieving it from the database, you can push this logic down to the database layer, which is generally more efficient. Custom lookups also make your code more readable and maintainable by encapsulating complex query logic.


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