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
![Syntax.fm logo]()
Tasty treats for web developers brought to you by Sentry. Get tips and tricks from Wes Bos and Scott Tolinski.
SEE EPISODES
Considered “not bad” by 4 million developers and more than 100,000 organizations worldwide, Sentry provides code-level observability to many of the world’s best-known companies like Disney, Peloton, Cloudflare, Eventbrite, Slack, Supercell, and Rockstar Games. Each month we process billions of exceptions from the most popular products on the internet.
A peek at your privacy
Here’s a quick look at how Sentry handles your personal information (PII).
×Who we collect PII from
We collect PII about people browsing our website, users of the Sentry service, prospective customers, and people who otherwise interact with us.
What if my PII is included in data sent to Sentry by a Sentry customer (e.g., someone using Sentry to monitor their app)? In this case you have to contact the Sentry customer (e.g., the maker of the app). We do not control the data that is sent to us through the Sentry service for the purposes of application monitoring.
Am I included?PII we may collect about you
- PII provided by you and related to your
- Account, profile, and login
- Requests and inquiries
- Purchases
- PII collected from your device and usage
- PII collected from third parties (e.g., social media)
How we use your PII
- To operate our site and service
- To protect and improve our site and service
- To provide customer care and support
- To communicate with you
- For other purposes (that we inform you of at collection)
Third parties who receive your PII
We may disclose your PII to the following type of recipients:
- Subsidiaries and other affiliates
- Service providers
- Partners (go-to-market, analytics)
- Third-party platforms (when you connect them to our service)
- Governmental authorities (where necessary)
- An actual or potential buyer
We use cookies (but not for advertising)
- We do not use advertising or targeting cookies
- We use necessary cookies to run and improve our site and service
- You can disable cookies but this can impact your use or access to certain parts of our site and service
Know your rights
You may have the following rights related to your PII:
- Access, correct, and update
- Object to or restrict processing
- Port over
- Opt-out of marketing
- Be forgotten by Sentry
- Withdraw your consent
- Complain about us
If you have any questions or concerns about your privacy at Sentry, please email us at [email protected].
If you are a California resident, see our Supplemental notice.