为何DRF类视图的GET/PUT/DELETE等方法需传入request参数？

Great observation! You’re totally right that self.request and the request parameter passed to methods like get() are the exact same object (as your print statement confirms). So why does DRF still require passing request as a parameter? Let’s break down the key reasons:

1. It aligns with Django’s core class view pattern #

DRF’s APIView inherits directly from Django’s built-in View class, which has used this method signature for HTTP handlers (get(), post(), etc.) since Django’s early versions. By keeping this pattern, DRF maintains consistency with Django’s existing ecosystem—developers who already know how to work with Django’s class-based views can transition to DRF without re-learning a new request-handling interface. It’s all about keeping things familiar and compatible.

2. Explicitness boosts code readability #

Having request as a visible parameter makes it immediately clear to anyone reading your code that this method depends on the request object. You don’t have to dig into parent class logic to figure out where self.request comes from; it’s right there in the method signature. This is especially helpful for new DRF developers who might not yet understand how the framework binds the request to the view instance.

3. It fits DRF’s request-handling workflow #

Behind the scenes, DRF’s APIView follows a specific sequence when processing a request:

• First, it runs the setup() method, which takes the incoming request and assigns it to self.request.
• Then, it calls the corresponding HTTP method (like get()) and passes that same request object as a parameter.

While self.request and the method parameter point to the same object, the parameter is part of the method’s public interface, and self.request acts as a convenience attribute you can reuse elsewhere in the view (like in helper methods such as your get_object()).

In short: it’s a combination of respecting Django’s conventions, making code more intuitive, and fitting into DRF’s internal request-handling flow—even though the two references are identical, the explicit parameter serves practical purposes.

内容的提问来源于stack exchange，提问作者andrea1493