How to Display Multiple Related Objects in a Django DetailView скачать в хорошем качестве

How to Display Multiple Related Objects in a Django DetailView

Learn how to modify a Django DetailView to display multiple related objects, such as entries for a topic, instead of just a single object. --- This video is based on the question https://stackoverflow.com/q/79386380/ asked by the user 'Mithel' ( https://stackoverflow.com/u/18323717/ ) and on the answer https://stackoverflow.com/a/79386834/ provided by the user 'Mark B' ( https://stackoverflow.com/u/13070/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to show multiple objects in Django detailview Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to drop me a comment under this video. --- Problem In Django, a DetailView by default displays a single object. Suppose you have two models: Topic and Entries, where each topic can have multiple entries. When clicking a topic link, you want to display all entries related to that topic rather than just one. Currently, the DetailView is set to show an Entries instance by primary key, which causes it to display only a single entry — and possibly the wrong one. Why This Happens Your URL pattern passes a topic's primary key. Your DetailView is trying to find a single Entries object by that ID. This leads to a mismatch because you're looking up an entry by topic ID, not entries related to a topic. Solution: Use DetailView on the Topic Model Instead of using DetailView on Entries, use it on the Topic model. This way, you get the selected topic as the single object. Updated View [[See Video to Reveal this Text or Code Snippet]] URL Pattern Make sure your URL passes the topic pk, e.g.: [[See Video to Reveal this Text or Code Snippet]] Displaying All Entries for the Topic in the Template Since Django automatically creates a reverse relation for your ForeignKey (default related name is entries_set unless overwritten), you can iterate over all entries of the topic in the template: [[See Video to Reveal this Text or Code Snippet]] Summary Use DetailView on the model representing the main object (Topic), not on the related model (Entries). Use the related manager (entries_set) to access all associated entries. Iterate over all entries in the detail template to show multiple related objects. This approach keeps the use of class-based views simple and leverages Django’s ORM relationships efficiently.