1 00:00:05,310 --> 00:00:10,560 Welcome back, everyone, in this lecture, we're going to explore the elite view, which allows us 2 00:00:10,560 --> 00:00:12,270 to delete an instance from a model. 3 00:00:13,020 --> 00:00:13,290 All right. 4 00:00:13,320 --> 00:00:19,290 Here I am inside our views that PI file in order to create a delete a view, we need to import that. 5 00:00:19,590 --> 00:00:24,600 So we'll say again from jangled that views generic import deletes view. 6 00:00:25,200 --> 00:00:27,440 This is a kind of a simple view. 7 00:00:27,450 --> 00:00:32,640 Basically, you just pointed to a primary key and then it has a one button form that says, Are you 8 00:00:32,640 --> 00:00:35,430 sure you want to delete this particular instance of the model? 9 00:00:35,910 --> 00:00:37,170 So let's set it up. 10 00:00:37,890 --> 00:00:42,570 We're going to create a class here, and I'm going to call it my teacher. 11 00:00:43,780 --> 00:00:49,510 Delete a view, and then we inherits from the view, we connect it to the model. 12 00:00:50,640 --> 00:00:57,540 And then keep in mind, the elite view is technically a form, it sends back a form that just has a 13 00:00:57,540 --> 00:01:05,160 single confirmed delete button because keep in mind if you're already on the deletes view, you're not 14 00:01:05,160 --> 00:01:10,740 looking to actually read all the fields of information, like on a detailed view or change any particular 15 00:01:10,740 --> 00:01:11,190 aspect. 16 00:01:11,220 --> 00:01:14,610 You basically just have a button, says, Hey, you're looking at this particular teacher, are you 17 00:01:14,610 --> 00:01:15,570 sure you want to delete them? 18 00:01:15,990 --> 00:01:21,690 So we're just going to say form go to confirm delete button, and we just simply connect it to a teacher. 19 00:01:21,700 --> 00:01:25,140 But because it is a form, we also need a success URL. 20 00:01:25,170 --> 00:01:30,300 I'm going to copy the same one we used for up the view because after deleting the teacher, we'll want 21 00:01:30,300 --> 00:01:33,000 to confirm that by going to the list of all the teachers. 22 00:01:33,390 --> 00:01:35,640 So we'll go ahead and save that change there. 23 00:01:36,480 --> 00:01:36,810 OK. 24 00:01:37,140 --> 00:01:38,730 So we have our daily view working. 25 00:01:38,730 --> 00:01:40,530 Let's connect it to our URLs. 26 00:01:41,040 --> 00:01:42,390 Will come to URLs. 27 00:01:42,420 --> 00:01:48,870 Remember to import teacher, delete, view and then create a new path here. 28 00:01:50,120 --> 00:01:51,990 And it's kind of up to you what you want to call this path. 29 00:01:52,010 --> 00:01:53,900 I'll call it deletes, underscore teacher. 30 00:01:54,320 --> 00:01:56,630 But remember, we don't want to just delete any old teacher. 31 00:01:56,630 --> 00:01:58,400 We have to delete a specific teacher. 32 00:01:58,400 --> 00:02:00,740 So we say integer primary key. 33 00:02:00,740 --> 00:02:03,110 Just read that for update and detail. 34 00:02:03,800 --> 00:02:08,630 And then we pass in teacher delete to view as a view. 35 00:02:09,080 --> 00:02:10,479 And if you want, you can give it a name. 36 00:02:10,490 --> 00:02:11,510 We don't use a name here. 37 00:02:12,080 --> 00:02:16,850 OK, so we have our delete teacher and then we need to set up our actual template. 38 00:02:17,360 --> 00:02:23,340 So the way this works is this once something you will kind of need to remember is a delete view. 39 00:02:23,510 --> 00:02:30,860 The default template name that it looks for is going to be your model underscore, confirm, underscore, 40 00:02:31,100 --> 00:02:32,510 delete the HTML. 41 00:02:32,990 --> 00:02:40,940 So in our case, that's going to be creating a new file with the name teacher underscore, confirm, 42 00:02:40,940 --> 00:02:43,310 underscore, delete the HTML. 43 00:02:43,760 --> 00:02:45,920 So that's what it automatically looks for. 44 00:02:46,310 --> 00:02:53,150 And in this case, you basically just have to create a form and inside that form, it's going to be 45 00:02:53,150 --> 00:02:54,080 a post method. 46 00:02:54,320 --> 00:02:57,260 So we'll say method is equal to post. 47 00:02:59,070 --> 00:03:02,280 And you need to pass in the seats are a token for security. 48 00:03:03,350 --> 00:03:09,440 And then you have a submit input button, and here maybe you want the value instead of being submit 49 00:03:09,440 --> 00:03:13,340 the value of the actual text inside the button to be confirm. 50 00:03:14,580 --> 00:03:21,120 Like delete or something like that, and you should probably have some information here of saying something 51 00:03:21,120 --> 00:03:27,030 like, are you sure you want to delete this teacher? 52 00:03:27,600 --> 00:03:29,980 And what's also nice about the delete view? 53 00:03:30,030 --> 00:03:36,350 It does send back an object of the teacher so you can actually grab information from it. 54 00:03:36,360 --> 00:03:41,610 So if you want it to, you could just to inform the person viewing this page of the teacher. 55 00:03:42,000 --> 00:03:42,330 OK. 56 00:03:42,660 --> 00:03:47,100 So that's why it's kind of similar to a detailed view and the fact that it is sending back this teacher. 57 00:03:47,310 --> 00:03:53,130 Except it also sends back the idea of this form that can then have this confirmation of the leak notice, 58 00:03:53,130 --> 00:03:55,490 how it doesn't actually send any labels or inputs. 59 00:03:55,500 --> 00:03:58,050 It's just a form that says, Hey, why don't you submit this? 60 00:03:58,290 --> 00:04:02,520 I'm going to go and grab this teacher in the database and then remove them through a delete call. 61 00:04:02,970 --> 00:04:05,640 So this is teacher underscore, confirm, delete. 62 00:04:06,840 --> 00:04:11,880 And that is how the elite view works, you connect it to a model and then take it to a success URL. 63 00:04:12,310 --> 00:04:17,440 And remember inside this URLs, I need to say delete feature with that particular integer call. 64 00:04:17,459 --> 00:04:18,690 That is the primary key. 65 00:04:19,170 --> 00:04:22,650 Then the question arises is where do we actually want to link to the teacher? 66 00:04:23,070 --> 00:04:26,760 Well, it probably makes sense to link it in the same way we linked to Update Teacher. 67 00:04:27,240 --> 00:04:34,800 So I'm going to go back to my teacher list view, and in the same way, I had this unordered list to 68 00:04:34,800 --> 00:04:36,720 update the information for the teacher. 69 00:04:37,230 --> 00:04:41,090 Let's create another nested unordered list here. 70 00:04:42,050 --> 00:04:45,950 So we'll go ahead and essentially copy this. 71 00:04:47,940 --> 00:04:49,500 And pasted again. 72 00:04:52,230 --> 00:04:53,790 So we'll put it in here. 73 00:04:54,210 --> 00:04:58,890 And in fact, this actually doesn't really need to be nested again or it's going to create another list 74 00:04:58,890 --> 00:05:01,590 item inside that same unordered list. 75 00:05:02,130 --> 00:05:02,610 There we go. 76 00:05:02,640 --> 00:05:07,290 So we'll have the teacher and then nested inside will be, Hey, do you want up the information or do 77 00:05:07,290 --> 00:05:08,040 you want to? 78 00:05:09,020 --> 00:05:11,360 Delete that teacher, so delete. 79 00:05:14,740 --> 00:05:16,000 And then save that. 80 00:05:16,210 --> 00:05:16,540 OK. 81 00:05:16,930 --> 00:05:23,080 So what this is saying is go ahead and go to delete teacher URL for that particular teacher I.D., which 82 00:05:23,080 --> 00:05:26,490 means it would take you to the late teacher URL for that particular I.D.. 83 00:05:26,740 --> 00:05:32,590 Which brings back a teacher delete view, which we know just connects to the teacher model and calls 84 00:05:32,860 --> 00:05:33,640 model confirmed. 85 00:05:33,640 --> 00:05:37,720 Delete that email, which we have here, that basically says, Hey, are you sure you want to delete 86 00:05:37,720 --> 00:05:38,320 this teacher? 87 00:05:38,770 --> 00:05:40,160 Here's the teacher going about to delete. 88 00:05:40,230 --> 00:05:40,930 Here's the form. 89 00:05:41,140 --> 00:05:41,830 Click Submit. 90 00:05:42,010 --> 00:05:47,090 And I'll go ahead and execute the deletion of that particular instance of the model. 91 00:05:47,110 --> 00:05:48,060 So let's check this all out. 92 00:05:48,070 --> 00:05:49,150 Make sure we didn't commit a typo. 93 00:05:49,510 --> 00:05:50,560 Then it refresh this. 94 00:05:50,920 --> 00:05:56,470 I'll go to this teacher page link and here it, says Adam Smith up the information for Adam Audley Adam. 95 00:05:56,740 --> 00:06:01,240 Obviously, we want to use some sort of more like secure coloring or really, it depends on your website 96 00:06:01,270 --> 00:06:03,550 of how you actually want to connect the deletion. 97 00:06:03,550 --> 00:06:05,290 But let's go to the third teacher here. 98 00:06:05,590 --> 00:06:10,090 I'll click Delete Third and it says, Hey, are you sure you want to delete this teacher? 99 00:06:10,600 --> 00:06:15,580 Third Teacher teaches math and I'm going to confirm delete and you notice it no longer shows up there. 100 00:06:15,610 --> 00:06:17,140 Let's go ahead and delete Adam Smith. 101 00:06:18,200 --> 00:06:19,400 That says, hey, are you sure you want to? 102 00:06:19,610 --> 00:06:24,020 The teacher, Adam Smith, teaches math and again, it makes sense that the form is just a single button 103 00:06:24,020 --> 00:06:26,690 form because what else information do you need to provide? 104 00:06:26,870 --> 00:06:30,470 It already knows the primary key automatically through the use of the class based view. 105 00:06:30,920 --> 00:06:32,510 So you click the lead and then boom. 106 00:06:33,080 --> 00:06:36,830 OK, so that's really it for our class based views. 107 00:06:37,130 --> 00:06:38,780 A very, very powerful tool. 108 00:06:39,140 --> 00:06:45,620 Again, you have the ability if we just kind of go back here through class based views, two in two 109 00:06:45,620 --> 00:06:49,670 lines connect to a template awesome through essentially three lines. 110 00:06:49,670 --> 00:06:53,180 Connect to a creation view where the creation is just a form. 111 00:06:53,570 --> 00:06:58,730 Then you can also again through three lines of attributes, just list all the instances and you have 112 00:06:58,730 --> 00:07:01,970 the flexibility here for the query set of how you want the list them. 113 00:07:02,390 --> 00:07:07,730 You have the ability to show a specific detail to update a specific instance and then delete a specific 114 00:07:07,730 --> 00:07:08,210 instance. 115 00:07:08,480 --> 00:07:14,810 And those are the key model based, class based views that are going to make your development life on 116 00:07:14,810 --> 00:07:18,290 The View's side of thing a lot more smoother. 117 00:07:18,290 --> 00:07:18,860 Comfortable. 118 00:07:19,280 --> 00:07:24,410 So we have the template, form, view, create, view, list, view, detailed view, update, view 119 00:07:24,410 --> 00:07:25,100 and The View. 120 00:07:25,370 --> 00:07:28,580 I would highly recommend that you use these as often as possible. 121 00:07:28,970 --> 00:07:36,380 The last caveat being is not every single view that you could possibly think of is ideally a class based 122 00:07:36,380 --> 00:07:36,680 view. 123 00:07:36,710 --> 00:07:41,300 There may be times where it just makes a lot more sense to write the custom function and take care of 124 00:07:41,300 --> 00:07:41,840 it that way. 125 00:07:42,110 --> 00:07:47,840 So this is also laid out in the Django documentation that there is not some magical class based view 126 00:07:47,840 --> 00:07:49,880 that exists for your specific situation. 127 00:07:50,180 --> 00:07:55,010 If it comes down to it, you can always go back to the function based view and add in a lot more logic. 128 00:07:55,280 --> 00:08:00,680 Remember, with the simplicity and ease of use of the class based views comes a lot more constraints 129 00:08:00,680 --> 00:08:01,340 and caveats. 130 00:08:01,610 --> 00:08:05,360 And if you ever find yourself outside of those constraints, you can always go back to the function 131 00:08:05,360 --> 00:08:05,570 based. 132 00:08:05,630 --> 00:08:07,430 You hope that was useful for you. 133 00:08:07,520 --> 00:08:08,480 I'll see you at the next lecture.