WEBVTT 00:02.280 --> 00:05.030 Okay, let's finish our function here. 00:05.040 --> 00:11.180 So basically for creating new rating, we'll need to have three things. 00:11.190 --> 00:17.090 So ratings needs to have a movie user and stars. 00:17.100 --> 00:22.770 So coming back to our views, we have our movie, we have our stars. 00:22.770 --> 00:25.530 So we can actually put it in a variable here. 00:26.130 --> 00:30.270 So stars will be equal to request. 00:31.840 --> 00:41.200 Data and then we can do stars like that because the stars are are in the request data. 00:41.200 --> 00:45.070 So we know so we can assign this to to the variable. 00:45.550 --> 00:48.580 And then what's missing here is the user. 00:48.580 --> 00:55.120 So I can do user and normally the user is part of our request. 00:55.120 --> 00:59.110 So request I can show you the user. 00:59.110 --> 01:01.540 So if I will do print. 01:03.250 --> 01:04.570 User here. 01:06.810 --> 01:10.020 I will save it now and then refresh it. 01:12.040 --> 01:13.570 So let's try to print. 01:13.570 --> 01:15.850 I we'll use the same method again. 01:15.850 --> 01:20.880 And coming back here, you can see user is anonymous. 01:20.890 --> 01:22.750 Why this is happening? 01:22.750 --> 01:29.790 Because at the moment Django can't really tell what user am I? 01:29.980 --> 01:32.340 Because I'm not really logged in. 01:32.350 --> 01:36.700 We haven't done that part yet and we don't have authentication yet. 01:36.730 --> 01:43.570 Normally, if you will pass a token, as we discussed that in the previous section, if you have the 01:43.570 --> 01:51.610 token authentication and with that request that that method, you will send an authorization token, 01:51.610 --> 01:56.560 then request user will have a information about that user. 01:56.560 --> 02:03.400 But at this point we don't have it yet, so we might save that for later. 02:04.120 --> 02:08.920 But for the moment I will just put a comment here and we'll come back to this. 02:08.950 --> 02:12.860 What we can do is we can create our static user. 02:13.650 --> 02:25.020 We know that we have only one user in our database, so we'll do user objects and then I can get ID 02:25.440 --> 02:26.770 equal to one. 02:26.790 --> 02:28.040 That's our user. 02:28.050 --> 02:30.300 We also need to import users. 02:31.860 --> 02:33.650 And we've done it already. 02:35.790 --> 02:37.530 Here in the models. 02:38.230 --> 02:39.300 So we'll copy that. 02:39.300 --> 02:40.410 And I can. 02:41.050 --> 02:42.190 Put it here. 02:43.690 --> 02:51.100 So we have our user, if I will do user now and let's say we'd like to have username. 02:58.910 --> 03:00.020 Send it again. 03:00.620 --> 03:02.990 Coming back here, you can see Christian. 03:02.990 --> 03:10.730 So we select the user based on the ID one that's a fixed ID, and then later on we'll replace with something 03:10.730 --> 03:12.070 more precise. 03:12.080 --> 03:16.310 So basically we could have another way to do it. 03:16.310 --> 03:24.950 So whatever we would like to use this function, we can also request it to have that user ID in the 03:24.950 --> 03:26.120 method itself. 03:26.120 --> 03:28.220 So this one is kind of very robust. 03:28.220 --> 03:30.680 So it will work for the login user. 03:30.680 --> 03:37.190 But if we would like to allow other peoples who are not logging into our system to make us some kind 03:37.190 --> 03:39.170 of rating, you will need to store it. 03:39.170 --> 03:46.040 But we kind of design it this way that in the models we say, okay, you need to pass the user and that 03:46.040 --> 03:48.410 need to be also unique together. 03:48.410 --> 03:50.090 So user and movie. 03:50.090 --> 03:56.870 So in the moment when you decided that you will pass the user, you need to actually create your application. 03:56.870 --> 04:03.210 This way the user will be extracted from the from the person who is doing that call. 04:03.210 --> 04:08.820 So if I'm logging now and I will try to do the rating, my user will be passed to that method. 04:08.820 --> 04:10.920 And this method we have it here. 04:10.920 --> 04:14.100 So it will later on will use this request user. 04:14.130 --> 04:16.680 At the moment we have our static. 04:17.800 --> 04:20.020 So what do we need to do here? 04:20.020 --> 04:23.170 We have movie, we have stars and we have user. 04:23.410 --> 04:28.510 So we have all the information we need to construct our rating. 04:29.080 --> 04:33.490 So what we can do first is we have two options. 04:33.490 --> 04:39.220 First, we will try to check if that rating already exists. 04:39.220 --> 04:46.450 So if we have something in our database with that movie and stars, if we do have it, then we'll update 04:46.450 --> 04:46.780 it. 04:46.780 --> 04:48.910 If we don't have it, we create a new. 04:48.910 --> 04:53.800 So in this way we'll have rate movie one method for two calls. 04:53.800 --> 04:58.390 So it will be like our standard post and put in one method. 04:58.390 --> 05:00.010 So let's try. 05:00.040 --> 05:05.650 We can do try and here we'll try to select something from our database. 05:05.650 --> 05:14.290 And I'm using keyword try here because otherwise if I will do this, might fail and it will break the 05:14.290 --> 05:15.100 whole method. 05:15.100 --> 05:16.450 But we don't want to break it. 05:16.450 --> 05:20.360 We just want to check if we have already that in the database. 05:20.360 --> 05:22.670 Otherwise we'll create create it. 05:22.670 --> 05:33.950 So let's do rating, we'll name rating and then we'll try to select the rating objects and then we'll 05:33.950 --> 05:42.050 try to get and get we need to do user is our user ID. 05:44.460 --> 05:45.560 And then movie. 05:46.960 --> 05:50.140 Will be equal to movie ID. 05:50.440 --> 05:52.660 This user is the whole object. 05:52.660 --> 05:54.070 This movie is the whole object. 05:54.070 --> 06:03.040 So what we are trying to get here is the user is stored as a if we do here this model foreign key, 06:03.070 --> 06:07.720 that's user ID, it's not the whole objects stored in a database. 06:07.720 --> 06:14.560 So whenever we try to get here, something from here, we are saying this user needs to be equal as 06:14.560 --> 06:17.320 user ID because that's what we store in database. 06:17.320 --> 06:20.110 So ID are stored in the database. 06:22.190 --> 06:31.090 Once we have that, we if we have something like a get, then we can do something about it. 06:31.090 --> 06:39.670 So we can do rating and then we can do stars equal to and then we have our variable stars. 06:41.480 --> 06:46.190 And then what we can do is rating and then we can do save. 06:49.100 --> 06:54.020 And then we can create something if that fails. 06:54.020 --> 07:01.040 So if there is no rating with that user and movie, this will fail and then we can catch it here and 07:01.040 --> 07:04.190 then we can create that object from scratch. 07:04.190 --> 07:06.620 So we do accept. 07:07.990 --> 07:08.680 Like that. 07:08.680 --> 07:13.630 And then we can use a similar function as we use here. 07:14.700 --> 07:17.190 So I will copy most of this here. 07:17.190 --> 07:20.610 So basically this time we'll do ratings objects. 07:22.050 --> 07:23.190 Create. 07:23.220 --> 07:30.000 So we will create in this time, instead of ID, we'll pass the whole objects because that will be done 07:30.000 --> 07:30.480 by us. 07:30.480 --> 07:35.910 And then we also need to do stars so stars will equal to stars. 07:36.060 --> 07:41.730 So we are creating here a new object with this user movie and star. 07:41.730 --> 07:43.680 So let's save it now. 07:47.760 --> 07:49.640 And then we have. 07:49.650 --> 07:51.210 We need to run it now. 07:52.480 --> 07:54.070 That's all working fine. 07:54.670 --> 08:00.570 And at the moment we still outputting this, but we can actually customize it. 08:00.660 --> 08:02.860 It depends on what we have done. 08:02.980 --> 08:08.050 So let's come back to the postman and send it here. 08:10.230 --> 08:11.770 And this is invalid. 08:11.790 --> 08:16.920 Later, you can see here we are trying to put whatever for the stars. 08:16.920 --> 08:21.360 But as you know, we put that validator validators in place. 08:21.360 --> 08:24.540 So we can't really put whatever here. 08:24.540 --> 08:27.060 And you can see 500 internal server error. 08:27.060 --> 08:29.460 So we need to put actual stars here. 08:29.490 --> 08:32.820 It's a kind of hint that it's already our method is kind of working. 08:32.820 --> 08:40.290 So if I will do two here, which is accepted acceptable value, I can send it now and you can see message 08:40.290 --> 08:40.800 is working. 08:40.800 --> 08:47.790 So what we can do here, I will go to another tab and I will do get method for the ratings and check 08:47.790 --> 08:50.880 if we actually have something in our database. 08:50.880 --> 08:52.530 Now I will send it. 08:52.740 --> 08:54.570 And indeed we have. 08:54.780 --> 09:04.170 So we have ID this movie one and then we have three stars, user and movie, and then we have for another 09:04.170 --> 09:04.710 movie. 09:04.710 --> 09:07.710 So this is movie two and this is movie one. 09:08.520 --> 09:12.070 Here we try to do a movie two. 09:12.070 --> 09:17.740 So if I will, let's say this, let's let's remember this one. 09:17.740 --> 09:22.690 So because this rating will be for movie two and that's my user one. 09:22.690 --> 09:24.940 And then we had stars two. 09:24.970 --> 09:32.650 So if I will come back here and I will do now Stars five and send it again for the same method for the 09:32.650 --> 09:37.060 same movie, let's come back here and see if that will change. 09:38.610 --> 09:40.570 And indeed that's been changed. 09:40.590 --> 09:49.410 So that means we updating the records, if I will go now and use this ID for rating. 09:49.500 --> 09:51.840 So that will be two. 09:53.410 --> 09:57.910 I will have only that rating for this one, but I would like to remove it now. 09:57.910 --> 10:01.720 So I will click, delete and send it and this is gone. 10:01.720 --> 10:03.430 So coming back to the list. 10:05.970 --> 10:08.550 And we need to to get. 10:10.570 --> 10:14.440 And you can see here I have only four movie won ratings. 10:14.440 --> 10:19.720 So coming back here with the same I won't change anything here and send it again. 10:19.720 --> 10:22.780 I'm expecting I will create that rating now. 10:23.850 --> 10:25.020 It's working here. 10:25.020 --> 10:27.120 And I will refresh it. 10:27.930 --> 10:29.970 And you can see here it's working. 10:29.970 --> 10:37.050 So our function if if the this rating doesn't exist for that movie, then it will be created. 10:37.050 --> 10:39.510 If it exists already, it will update it. 10:39.540 --> 10:44.190 So this is what we achieved here in our method. 10:44.190 --> 10:45.630 So what else we can do? 10:45.630 --> 10:51.360 Because at the moment we whatever we do here, we have our message like that. 10:51.360 --> 10:57.540 But what we can do is we can output back the data that we passed in. 10:57.570 --> 11:04.950 So I will make more space here and we can do a different things for try and we can do different things 11:04.950 --> 11:06.420 for creating here. 11:07.050 --> 11:09.240 So let's grab this. 11:10.040 --> 11:16.230 I will put it here first, and then we'll do something so I can do here. 11:18.030 --> 11:18.420 Either. 11:18.420 --> 11:24.210 That's just a variable and then we can use a serializer to serialize the data. 11:24.240 --> 11:28.460 I will do writing serializer here and I will put it there. 11:28.470 --> 11:35.550 So writing Serializer the same way we've done it before, we can pass to this rating serializer what 11:35.550 --> 11:36.900 we would like to serialize. 11:36.930 --> 11:40.920 We have our rating object there, so I can serialize that. 11:40.920 --> 11:43.650 I can also say that's many false. 11:43.680 --> 11:50.430 So it's only one, uh, one rating and we have that data there. 11:50.430 --> 12:00.210 So the message is we can change it for rating, update it, and then we can in this the same object 12:00.210 --> 12:04.230 we can do, for example, result. 12:05.780 --> 12:09.500 And then we can do serializer data. 12:09.860 --> 12:16.700 So what we are doing here is we select the serializer with our updated rating when we save it. 12:16.730 --> 12:26.190 Then we add more information into our response and we pass that response with the Http 200. 12:26.210 --> 12:31.400 So I will just copy this and I will go here. 12:31.760 --> 12:39.490 So this time we need to also apply this create into our variable. 12:39.500 --> 12:44.210 So we will have our rating here that will be effect of creating our rating. 12:44.210 --> 12:53.840 And then we serialize that data and then we can do rating created this time and we will also put it 12:53.840 --> 12:54.350 there. 12:56.120 --> 13:02.660 So coming back to the postman and let's try to come here and then I will do send. 13:03.680 --> 13:08.180 You can see here, message rating updated and that was updated. 13:08.180 --> 13:14.540 So I can do three here and the start three are here. 13:14.540 --> 13:23.630 So if I will remove that this one because I would like to test how this the output will be when I create 13:23.630 --> 13:26.690 something, I need to remove ID3. 13:26.690 --> 13:30.710 So I'll do three and then change the method to. 13:31.640 --> 13:35.660 Delete and then send it here and you can see nothing is there. 13:35.660 --> 13:40.670 But if I will now try to, let's do four. 13:40.760 --> 13:45.830 I'm expecting the message will be created and the starts will be four. 13:47.040 --> 13:50.520 You can see writing created and the stars for. 13:51.060 --> 13:53.130 So we have our method. 13:54.230 --> 13:55.640 Here created. 13:55.640 --> 14:03.800 So we cover a lot of things here, and I've done that in purpose because I would like to show you what 14:03.800 --> 14:08.300 are the different possibilities when we have our own function. 14:08.300 --> 14:12.110 So what we can do here is we can validate the request data. 14:12.110 --> 14:19.640 We can select some objects from our database using this syntax that we talked about it before. 14:19.640 --> 14:27.620 Then we can do different things based on the existence in the database and then we know how to output 14:27.620 --> 14:30.530 something inside our. 14:31.560 --> 14:32.370 Response. 14:32.370 --> 14:36.330 So this is the object that we actually constructed on our own. 14:36.330 --> 14:37.410 And this. 14:37.440 --> 14:38.640 Is optional. 14:38.640 --> 14:39.810 You don't need to do this. 14:39.810 --> 14:41.100 You don't need to do this. 14:41.130 --> 14:47.190 And then it's all depends on how you would like to do things in our front end. 14:47.190 --> 14:54.870 So if you require some kind of message for your user to be displayed like a rating created, you can 14:54.870 --> 15:01.290 pass it as a message and then the result will be updated results or whatever you need to do. 15:01.320 --> 15:07.110 You have full options here because all of that is our own code so we can decide it. 15:07.140 --> 15:09.510 What will we put in the object? 15:09.540 --> 15:11.220 What will be the message? 15:11.220 --> 15:13.860 What will be the status and so on and so on. 15:13.860 --> 15:21.780 So you can see here we've created a simple method of our own, but it will be very powerful because 15:21.780 --> 15:28.530 we can have one method that will work for for either update or for post.