1 00:00:00,890 --> 00:00:02,240 Hi, and welcome back. 2 00:00:02,240 --> 00:00:05,700 In this video, we are going to add another Resource 3 00:00:05,700 --> 00:00:08,883 to our application just to help with testing. 4 00:00:10,530 --> 00:00:13,300 Now, in the last few sections, 5 00:00:13,300 --> 00:00:14,450 we were creating users, 6 00:00:14,450 --> 00:00:17,350 authenticating with them, using Flask JWT 7 00:00:17,350 --> 00:00:20,720 but we were never able to retrieve information 8 00:00:20,720 --> 00:00:22,860 about a specific user to make sure that, 9 00:00:22,860 --> 00:00:26,170 you know, it existed and it was all good. 10 00:00:26,170 --> 00:00:28,810 And also, we were not able to delete users. 11 00:00:28,810 --> 00:00:30,550 So every time we wanted to, you know, 12 00:00:30,550 --> 00:00:33,760 re-register, we had to delete data.db 13 00:00:33,760 --> 00:00:35,310 and bring it back and so forth. 14 00:00:36,750 --> 00:00:39,210 By the way, talking about data.db, 15 00:00:39,210 --> 00:00:41,310 remember that data.db gets created for you 16 00:00:41,310 --> 00:00:43,480 whenever you run your application 17 00:00:43,480 --> 00:00:45,380 and here, in Visual Studio Code, 18 00:00:45,380 --> 00:00:49,020 I've got a terminal that is exactly the same 19 00:00:49,020 --> 00:00:50,450 as in any other terminal. 20 00:00:50,450 --> 00:00:52,270 It's got the virtual environment enabled, 21 00:00:52,270 --> 00:00:55,640 and it can run my application in here, so. 22 00:00:55,640 --> 00:00:57,410 Just gonna make things a little bit simpler for you 23 00:00:57,410 --> 00:00:59,320 without me having to switch back and forth 24 00:00:59,320 --> 00:01:00,270 between terminals. 25 00:01:00,270 --> 00:01:01,660 We've got a terminal here, 26 00:01:01,660 --> 00:01:05,150 and but we're gonna close it for now cause we don't need it. 27 00:01:05,150 --> 00:01:09,390 Okay, let's go into adding our Resource. 28 00:01:09,390 --> 00:01:13,460 We're gonna go into user.py in resources. 29 00:01:13,460 --> 00:01:15,600 And we're gonna see that here we've got our 30 00:01:15,600 --> 00:01:17,930 user register class. 31 00:01:17,930 --> 00:01:20,670 This Resource we created a long time ago 32 00:01:20,670 --> 00:01:23,220 for creating or registering new users. 33 00:01:23,220 --> 00:01:25,760 And it takes in a username and a password, 34 00:01:25,760 --> 00:01:28,590 and it has a host method that allows us 35 00:01:28,590 --> 00:01:32,203 to create new user modules and save them to the database. 36 00:01:33,370 --> 00:01:35,260 Now, I'm gonna just collapse that 37 00:01:35,260 --> 00:01:37,290 by pressing the little minus icon there, 38 00:01:37,290 --> 00:01:38,800 so give us a bit more room. 39 00:01:38,800 --> 00:01:41,080 And we're gonna create a new resource, 40 00:01:41,080 --> 00:01:45,890 so that we can retrieve user details and delete users. 41 00:01:45,890 --> 00:01:49,140 This is gonna be a small resource that you already know 42 00:01:49,140 --> 00:01:53,240 how to make, in order to just enable us to do this. 43 00:01:53,240 --> 00:01:55,310 So, we're gonna call it user, 44 00:01:55,310 --> 00:01:58,160 and it's going to inherit from the Resource class 45 00:01:58,160 --> 00:01:59,853 that we already know and love. 46 00:02:00,730 --> 00:02:02,823 And it's gonna have two methods. 47 00:02:04,330 --> 00:02:09,330 A get, that is going to take a user ID 48 00:02:11,430 --> 00:02:12,800 and is also going to have 49 00:02:14,870 --> 00:02:15,973 a delete method, 50 00:02:16,840 --> 00:02:19,600 that is also going to take our user ID. 51 00:02:19,600 --> 00:02:22,320 This is similar to, for example, 52 00:02:22,320 --> 00:02:24,610 our store resource, 53 00:02:24,610 --> 00:02:26,290 that I'm going to open just now, 54 00:02:26,290 --> 00:02:30,250 where each of the endpoints take in the name. 55 00:02:30,250 --> 00:02:33,720 The only difference is that these here are class methods, 56 00:02:33,720 --> 00:02:37,360 because we don't actually need to access self at all. 57 00:02:37,360 --> 00:02:38,820 So I'm going to make them class methods 58 00:02:38,820 --> 00:02:43,493 just for simplicity and this is fine in flask_restful. 59 00:02:44,810 --> 00:02:45,643 Okay. 60 00:02:46,810 --> 00:02:51,480 Now, in the get, all we need to do is take this user ID 61 00:02:51,480 --> 00:02:54,910 and find a user model and then return it. 62 00:02:54,910 --> 00:02:59,853 So we're gonna do user is user model, find by ID, user ID. 63 00:03:00,900 --> 00:03:03,030 And then we're gonna say, if not user, 64 00:03:03,030 --> 00:03:05,990 meaning we didn't find a user in our database, 65 00:03:05,990 --> 00:03:08,500 we're gonna return just a message saying, 66 00:03:08,500 --> 00:03:11,663 user not found. 67 00:03:12,620 --> 00:03:15,370 And we're gonna return in code 404. 68 00:03:15,370 --> 00:03:17,893 Otherwise, we're gonna return user.json. 69 00:03:18,840 --> 00:03:21,310 Remember, the user here is the user model 70 00:03:21,310 --> 00:03:23,357 we retrieved from the database. 71 00:03:23,357 --> 00:03:27,610 .Json is gonna call the json method of that user object 72 00:03:27,610 --> 00:03:28,803 and return that. 73 00:03:30,050 --> 00:03:31,760 Now, that's a good point to think about, 74 00:03:31,760 --> 00:03:34,670 whether we have a json method in our user. 75 00:03:34,670 --> 00:03:35,759 And the answer is, 76 00:03:35,759 --> 00:03:37,743 oh sorry opened this store by accident. 77 00:03:38,670 --> 00:03:41,960 The answer is we don't have a json method in our user, 78 00:03:41,960 --> 00:03:44,160 so we'll have to create it, and that's fine. 79 00:03:45,230 --> 00:03:46,470 Here, underneath in it, 80 00:03:46,470 --> 00:03:50,490 we are going to go ahead and create the json. 81 00:03:50,490 --> 00:03:55,363 And always going to return is an ID and the username. 82 00:03:56,940 --> 00:03:58,935 Don't return the password here, 83 00:03:58,935 --> 00:04:02,520 that would be a terribly insecure thing to do, 84 00:04:02,520 --> 00:04:04,450 so that will be a bad idea 85 00:04:04,450 --> 00:04:06,663 even though this is only for testing, 86 00:04:06,663 --> 00:04:09,510 just in case something does happen, 87 00:04:09,510 --> 00:04:13,840 better not return the password there, so, yeah. 88 00:04:13,840 --> 00:04:14,673 Let's close that. 89 00:04:14,673 --> 00:04:19,180 Now we have user.json and this endpoint should work. 90 00:04:19,180 --> 00:04:22,730 Of course we have to add our user class to our ab.py 91 00:04:22,730 --> 00:04:23,890 We're gonna do that in just a moment. 92 00:04:23,890 --> 00:04:28,860 But first, let's go ahead and implement our delete. 93 00:04:28,860 --> 00:04:31,022 It's gonna be fairly similar, 94 00:04:31,022 --> 00:04:34,800 we're gonna find by ID our user ID. 95 00:04:34,800 --> 00:04:36,940 If the user doesn't exist, 96 00:04:36,940 --> 00:04:39,100 we are going to return another 404 97 00:04:39,100 --> 00:04:41,970 saying that the user does not exist. 98 00:04:41,970 --> 00:04:45,990 Otherwise, we are going to user.delete.from_db 99 00:04:45,990 --> 00:04:48,140 and then we are going to return our message 100 00:04:49,230 --> 00:04:51,093 saying something like user deleted. 101 00:04:53,570 --> 00:04:56,710 Okay, now delete_from_db, 102 00:04:56,710 --> 00:04:58,273 is that present in our user? 103 00:05:00,210 --> 00:05:01,910 It seems like it is not, 104 00:05:01,910 --> 00:05:03,083 so we can do that. 105 00:05:04,057 --> 00:05:05,224 Delete_from_db 106 00:05:08,250 --> 00:05:11,800 or we can do db.session.delete self 107 00:05:13,010 --> 00:05:14,780 and db.session.commit 108 00:05:16,520 --> 00:05:19,363 Okay, now we have that in here. 109 00:05:20,210 --> 00:05:22,060 So once again, our Resource, all it's doing 110 00:05:22,060 --> 00:05:24,350 is going over and finding a user by ID 111 00:05:24,350 --> 00:05:28,640 which is coming over to our model and running this here. 112 00:05:28,640 --> 00:05:32,970 Gonna query all directories filtered by the userID 113 00:05:32,970 --> 00:05:35,310 being equal to the parameter we pass in. 114 00:05:35,310 --> 00:05:37,280 And it's gonna get the first user that matches that, 115 00:05:37,280 --> 00:05:38,630 hopefully there should only be one 116 00:05:38,630 --> 00:05:40,893 since our IDs should be unique. 117 00:05:42,240 --> 00:05:44,360 If it doesn't exist, it's gonna return user not found 118 00:05:44,360 --> 00:05:45,680 in both cases, 119 00:05:45,680 --> 00:05:48,171 otherwise it's either gonna return the user.json 120 00:05:48,171 --> 00:05:50,470 or it's gonna delete it from the database 121 00:05:50,470 --> 00:05:52,943 and return a message saying user deleted. 122 00:05:54,290 --> 00:05:57,600 Now we have to go over to our ab.py and make sure 123 00:05:57,600 --> 00:06:00,683 that we import the user. 124 00:06:02,690 --> 00:06:06,490 And the user resource there, from resources.user, 125 00:06:06,490 --> 00:06:07,840 and then of course down here, 126 00:06:07,840 --> 00:06:09,680 we also have to add it in. 127 00:06:09,680 --> 00:06:13,060 So we're gonna add resource user 128 00:06:13,060 --> 00:06:16,293 and it's gonna be slash user there. 129 00:06:17,440 --> 00:06:19,930 Now, remember how just like our stores, 130 00:06:19,930 --> 00:06:24,290 the user endpoints here are taking a user ID. 131 00:06:24,290 --> 00:06:25,830 So going back to our app.py, 132 00:06:25,830 --> 00:06:27,700 we also have to make sure to pass that in 133 00:06:27,700 --> 00:06:30,380 just like we did for items and stores. 134 00:06:30,380 --> 00:06:33,740 So we're gonna do int:user_id 135 00:06:33,740 --> 00:06:36,703 because our user IDs in our database are always numbers. 136 00:06:38,090 --> 00:06:38,923 Saving that, 137 00:06:38,923 --> 00:06:40,020 let's go over to our model, 138 00:06:40,020 --> 00:06:43,210 and remember, here the IDs they find as an integer, 139 00:06:43,210 --> 00:06:46,790 so the thing that we're passing over to our endpoints 140 00:06:46,790 --> 00:06:48,090 also has to be an integer. 141 00:06:50,380 --> 00:06:51,440 So that's it, 142 00:06:51,440 --> 00:06:52,680 we've set it up, 143 00:06:52,680 --> 00:06:55,820 now our Resource should be usable. 144 00:06:55,820 --> 00:07:00,230 Let's go ahead and have a look at how we can use it 145 00:07:00,230 --> 00:07:01,283 from within Postman.