How Can I Combine Two or More QuerySets in a Django View?
James W.
—The Problem
You know that Django allows for the creation of QuerySets from the database by making use of methods like filter() or exclude().
But can we create a QuerySet out of a combination of other QuerySets?
Say we wanted to create a QuerySet from data collected from two different models. The use of the filter() and exclude() methods would not help here.
Or we might be creating a QuerySet with complex inclusions and exclusions using the filter() and exclude() methods, and it would be simpler to create multiple QuerySets and then combine them into a single set.
The Solution
It is possible to combine QuerySets into another QuerySet, and they do not have to be from the same model.
The Python union operator can be used to combine QuerySets that belong to the same model.
Two or more QuerySets can be combined using the union operator with the following syntax:
model_combination = model_set1 | model_set2 | model_set3
You can also use the chain() method from the Itertools module, which allows you to combine two or more QuerySets from different models through concatenation.
from itertools import chain model_combination = list(chain(model_set1, model_set2))
Alternatively, you can use union() to combine two or more QuerySets from different models, passing all=TRUE if you want to allow duplicates.
model_combination = model_set1.union(model_set2, all=TRUE)
Further Reading
For some tips on working with Django on Sentry, have a look at these articles:
- Syntax.fmListen to the Syntax Podcast
- Community SeriesIdentify, Trace, and Fix Endpoint Regression Issues
- ResourcesBackend Error Monitoring 101
- Listen to the Syntax Podcast
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