Chain together multiple (disparate) QuerySets to treat them as a single QuerySet.
django-querysetsequence adds helpers for treating multiple disparate QuerySet obejcts as a single QuerySet. This is useful for passing into APIs that only accepted a single QuerySet.
The QuerySetSequence wrapper is used to combine multiple QuerySet instances.
QuerySetSequence aims to provide the same behavior as Django’s QuerySets, but applied across multiple QuerySet instances.
- Methods that take a list of fields (e.g. filter(), exclude(), get(), order_by()) must use fields that are common across all sub-QuerySets.
- Relationships across related models work (e.g. 'foo__bar', 'foo', or 'foo_id'). syntax).
- The sub-QuerySets are evaluated as late as possible (e.g. during iteration, slicing, pickling, repr()/len()/list()/bool() calls).
- Public QuerySet API methods that are untested/unimplemented raise NotImplementedError.
Install the package using pip.
pip install --upgrade django-querysetsequence
# Import QuerySetSequence from queryset_sequence import QuerySetSequence # Create QuerySets you want to chain. from .models import SomeModel, OtherModel # Chain them together. query = QuerySetSequence(SomeModel.objects.all(), OtherModel.objects.all()) # Use query as if it were a QuerySet! E.g. in a ListView.
django-querysetsequence is released under the ISC license, its documentation lives on Read the Docs, the code on GitHub, and the latest release on PyPI. It supports Python 3.6+, Django 2.2+, and is optionally compatible with Django REST Framework 3.9+.
Some ways that you can contribute:
- Check for open issues or open a fresh issue to start a discussion around a feature idea or a bug.
- Fork the repository on GitHub to start making your changes.
- Write a test which shows that the bug was fixed or that the feature works as expected.
- Send a pull request and bug the maintainer until it gets merged and published.
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