Customizing Viewsets

Welcome back. 0:00 Previously I created a new version of the API and 0:02 used resframeworks, view sets and routers. 0:04 This allowed me to combine all of my grade views into a single class. 0:07 And the router automatically generated the URLs. 0:10 I also wrote a custom view method to list coarser views on the course view set. 0:12 I still have one problem to solve in this V two implantation though. 0:17 My review V sec class extends REST frameworks model views that class. 0:21 Which hopefully provides views for creating destroying. 0:25 Listing, retrieving and updating reviews. 0:28 But since I created that review list view and 0:30 a view that lists all the reviews on the site doesn't seem really useful. 0:32 I need to get picky about which views this view set provides. 0:36 So to start customizing these views, or the view sets rather, 0:41 I need to bring in Django REST frameworks mix ins. 0:45 Mix ins are, if you're not, if you're like, I know that word, but 0:50 I can't know what it is. 0:54 Mix ins are a little small classes. 0:55 That you mix in to create larger classes. 0:58 So it's a way of doing inheritance instead of composition. 1:02 We'll talk more about that in later courses. 1:06 So. I wanna show you what the model of view 1:08 sets class definition looks like. 1:11 So we're using this thing here. 1:14 I wanna show you what that actually looks like. 1:15 So, if I was a do model, view, set and I was working for Jango REST framework. 1:17 This is what I would've put in. 1:23 So, mixins.CreateModel\ mixin, 1:24 mixins.RetrieveModelMixin, mixinUpdatemodelMixin and 1:29 destroyModelMixin and, two more, 1:38 mixins.ListModelMixin. 1:44 And then, the viewsets.GenericViewSet. 1:48 And then, pass. 1:53 So. 1:57 Or I might have passed for now least. 1:58 So model view set just a combination of generic view set and 2:00 then all of these mix ins, your mix ins come before your 2:04 class that they're modifying so that stuff gets evaluated in the right order. 2:07 So anyway this is what's normally there. 2:13 So the Create model mix in is what handles the creation, the retrieve model mix 2:15 in is what handles the retrieving of a single object of a single model instance. 2:20 The update is what handles updating a single one, 2:26 destroys what handles destroying one and 2:29 the list is what handles getting the query set for the full list of them. 2:31 So, you can see each one of these things just does one little specific bit. 2:36 And then the generic view set is what handles like, 2:40 I'm going to make all these views that do this stuff go, right. 2:42 So if I want to do all of the stuff but I don't wanna have the list, 2:47 it would make sense to just build this again instead of using this. 2:53 right? 3:00 I got an easier way though, you ready to see the easy way? 3:01 Here it comes. 3:04 Delete that, rename this to ReviewViewSet, Delete those two lines. 3:06 Hey, look at that! 3:14 Now I have a model view set that doesn't do lists. 3:16 Cuz that's what I want. 3:21 So, hey cool! 3:23 [LAUGH] We just did it right there, yeah. 3:25 Isn't that amazing? 3:28 So this should be able to work. 3:30 I should be able to go to v2/reviews and method get is not allowed 405 right. 3:32 It's not exactly a 404. 3:41 It's not like hey that doesn't exist but it's a 405. 3:42 The method isn't allowed, I'm not allowed to use get on reviews. 3:45 I can't just get a whole list of reviews and 3:49 APIs get the 405, then your okay I can't do that. 3:52 But if I try to get just one review because I know I have a single 3:56 review in there. 3:59 I get that actual review, right? 4:00 I can get that review, I can put, patch, delete, header, options it. 4:02 So, awesome! 4:05 Effectively I've created a whole second version of this API. 4:07 I wrote less code than I did before. 4:11 I think that's pretty impressive. 4:13 It's a good idea to look over the documentation for both routers and 4:16 view sets, so I put links to both of them in the usual place. 4:19 The teachers notes. 4:22 At this point you've learned the majority of creating API views with Django REST 4:24 framework you started very low level with API view moved up to generic views and 4:27 then finished it all off with view sets and routers. 4:32 All of these views have been class based views, but 4:35 it is possible to create API views with traditional function based views 4:37 using some decorators that REST framework provides. 4:41 If function based views are more your style. 4:44 Check out the teachers notes for a link to the relevant documentation. 4:46