How to Create a Routable Reverse Foreign Key Relationship with Django REST Framework скачать в хорошем качестве

How to Create a Routable Reverse Foreign Key Relationship with Django REST Framework

Learn how to set up a `nested viewset` in Django REST Framework to access stock prices for a specific stock using `drf-nested-routers`. --- This video is based on the question https://stackoverflow.com/q/68995667/ asked by the user 'Aran Freel' ( https://stackoverflow.com/u/4857686/ ) and on the answer https://stackoverflow.com/a/69006602/ provided by the user 'Brian Destura' ( https://stackoverflow.com/u/6759844/ ) 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: DRF Django - make routable reverse foreign key relationship data 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 write me at vlogize [AT] gmail [DOT] com. --- Creating a Routable Reverse Foreign Key Relationship in Django REST Framework In this guide, we'll tackle a common scenario when working with Django and Django REST Framework (DRF)—how to set up a routable reverse foreign key relationship data. This is particularly useful when you want to access related data for a certain model based on a specific field, like retrieving stock prices for a given stock ticker in our example. The Problem Let's assume you have two models in a Django project: Stock and StockPrice. While Stock contains details about different stocks, StockPrice holds pricing information related to those stocks. The relationship between these two models is defined through a foreign key. Here's how the models are structured: Stock includes fields like ticker, exchange, and name. StockPrice has attributes like date, open, and close, and it has a foreign key that links back to Stock through the ticker field. You may want to create route patterns that allow users to easily fetch the stock prices specifically for a stock ticker, using URLs like localhost:8000/stocks/aapl/price/. However, the current setup shows all stock prices instead, which is not the expected behavior. The Solution To achieve this, you need to customize the StockPriceViewSet to filter prices based on the provided stock ticker. This can be done by overriding the get_queryset method. Let’s explore how to implement this effectively. Step 1: Modify the StockPriceViewSet In the StockPriceViewSet, you need to filter the queryset based on the stock ticker supplied in the URL. Here's how to implement it: [[See Video to Reveal this Text or Code Snippet]] In the above code snippet, we first call the get_queryset() from the superclass to obtain the base queryset. Then, we add logic to filter the StockPrice objects based on the stocks_ticker keyword argument obtained from the URL. Step 2: Set Up Nested Routing If your StockPriceViewSet is a nested viewset on the StockViewSet, implement it as follows: [[See Video to Reveal this Text or Code Snippet]] This simpler form ensures that you are directly referencing the stocks_ticker from the URL lookup to filter your queryset. Hence, when you make a GET request to localhost:8000/stocks/appl/price/, you'll be able to retrieve only the price data associated with stock ticker 'aapl'. Conclusion By overriding the get_queryset() method in your StockPriceViewSet, you can effortlessly filter your data based on a specified stock ticker in the URL. This not only enhances the functionality of your API but also provides a better user experience for those looking for specific stock price data. With these modifications, you'll ensure a clear, routable reverse foreign key relationship that works seamlessly. Users will appreciate the ability to retrieve precise data without having to sift through unrelated stock prices. By following this guide, you now have a working example of how to create nested routes in Django REST Framework successfully. Happy coding!