1 00:00:00,180 --> 00:00:06,000 Beautiful, and once we're familiar with Virtualize now, I want to show you, finally, why are we 2 00:00:06,000 --> 00:00:06,900 used here? 3 00:00:06,930 --> 00:00:12,870 This dot remove so in the product, why were used the bathroom? 4 00:00:13,530 --> 00:00:21,030 And the idea is following we have the product correct and we have some reviews associated with that 5 00:00:21,030 --> 00:00:21,450 product. 6 00:00:22,400 --> 00:00:26,000 But what happens when we remove the product? 7 00:00:26,630 --> 00:00:33,800 Does it make sense that we have some kind of revenues laying around, even though they're not associated 8 00:00:34,160 --> 00:00:35,720 with any type of product? 9 00:00:36,410 --> 00:00:43,640 And of course, just like with all my questions, very, very obvious answer is no, we don't want that. 10 00:00:44,120 --> 00:00:52,130 And how we can accomplish that, well, we could set up a perimeter, a move hook basically before we 11 00:00:52,130 --> 00:00:53,240 remove the product. 12 00:00:53,510 --> 00:01:02,000 I want to go to a review model, get the reviews that are associated with the specific product and just 13 00:01:02,000 --> 00:01:02,570 remove them. 14 00:01:02,990 --> 00:01:10,190 And if you remember when we were seeding the database, we use this delete many, not exactly the method 15 00:01:10,460 --> 00:01:11,420 we're going to use. 16 00:01:11,960 --> 00:01:20,330 And just like in the previous examples, the reason why we're using here is remove because of this will 17 00:01:20,690 --> 00:01:22,370 trigger that hook. 18 00:01:23,290 --> 00:01:30,340 So unlike the fine wine elite, it wouldn't trigger, but with this remove, it triggers the hook and 19 00:01:30,340 --> 00:01:31,900 therefore we have it here. 20 00:01:32,350 --> 00:01:41,590 So now let's go to the product model or it is right over here and then right below the vertical, we're 21 00:01:41,590 --> 00:01:44,700 going to go with product schema vanguard. 22 00:01:45,190 --> 00:01:47,020 And then we go to pre now. 23 00:01:47,020 --> 00:01:48,760 In this case, though, it's not pretty safe. 24 00:01:49,180 --> 00:01:50,920 We're going to go with pre remove. 25 00:01:51,680 --> 00:01:54,720 And in here, it's going to be a sync function. 26 00:01:55,690 --> 00:02:01,370 Again, will go with good old function word, because where you want to access that venerable go forward 27 00:02:01,390 --> 00:02:04,480 next year, if you remember this was technically optional. 28 00:02:04,840 --> 00:02:09,639 With the latest versions of Mongoose, we don't actually need to call that, but let's just leave it 29 00:02:09,639 --> 00:02:09,970 there. 30 00:02:10,370 --> 00:02:13,060 And in this case, I want to go with a wait. 31 00:02:13,420 --> 00:02:14,890 This is going to be asynchronous. 32 00:02:15,340 --> 00:02:16,560 And what's really cool? 33 00:02:16,570 --> 00:02:24,860 Not only I can access this model by using this actually have a method there by the name of model. 34 00:02:25,240 --> 00:02:29,170 Now in the model, I can pass in a different model. 35 00:02:29,530 --> 00:02:31,120 Now what is the model that I'm looking for? 36 00:02:31,150 --> 00:02:37,030 Well, when I'm removing the product, I want to access the review model, correct? 37 00:02:37,090 --> 00:02:38,830 So and here we type review. 38 00:02:39,400 --> 00:02:46,480 Then we go with the method name and we go with delete, delete and many now in delete. 39 00:02:46,480 --> 00:02:51,400 Many we want to specifically say, Well, what review is we want to remove? 40 00:02:51,730 --> 00:02:55,810 And we want to remove the reviews were product matches. 41 00:02:55,810 --> 00:02:58,090 What was that underscore score? 42 00:02:58,450 --> 00:03:03,040 Now we cannot see c underscore idea, but we know that when every document there is that property. 43 00:03:03,430 --> 00:03:08,110 So go here would product is equal to this underscore. 44 00:03:08,680 --> 00:03:15,070 If you're wondering why we go here with the product, because that's the property on the review model 45 00:03:15,370 --> 00:03:16,990 that references the product. 46 00:03:18,100 --> 00:03:24,490 Like I said, we go here with this on the score and I.D. We share it. 47 00:03:24,850 --> 00:03:28,810 Let me try without next and let's see how it works out. 48 00:03:29,320 --> 00:03:33,430 So now I'm going to head back to the postman again. 49 00:03:33,430 --> 00:03:40,000 I'm going to get all the reviews and they are associated with only one product. 50 00:03:41,220 --> 00:03:48,930 So first, I guess I need to organize John, correct, because only admins have those privileges, so 51 00:03:48,930 --> 00:03:49,980 I'm going to go with John. 52 00:03:51,080 --> 00:03:53,600 I log in and then. 53 00:03:54,800 --> 00:03:56,570 Let me get this, Heidi. 54 00:03:57,410 --> 00:03:58,340 That's the product. 55 00:03:59,060 --> 00:04:00,260 It's very, very important. 56 00:04:01,760 --> 00:04:03,710 Now I want to remove the product. 57 00:04:04,130 --> 00:04:05,510 So let me go back here. 58 00:04:06,140 --> 00:04:07,100 Let me remove it. 59 00:04:07,130 --> 00:04:10,910 Let me send and I successfully remove the product. 60 00:04:11,900 --> 00:04:18,709 And here comes the moment of truth, whether I see any reviews because both reviews were associated 61 00:04:18,709 --> 00:04:26,600 with that, and once I said I have no reviews, which means that the logic works once we remove the 62 00:04:26,600 --> 00:04:27,200 product. 63 00:04:27,920 --> 00:04:35,930 Right before we do that, we go to reviews and we're delete all the reviews that are associated with 64 00:04:36,170 --> 00:04:37,500 this particular product. 65 00:04:37,520 --> 00:04:44,690 And again, I know I'm repeating myself, but that was the deal why we needed to use here this hour 66 00:04:44,690 --> 00:04:49,940 wait product or move because this one will trigger the hook. 67 00:04:50,630 --> 00:04:51,880 Hopefully, that's clear. 68 00:04:52,240 --> 00:04:58,970 And now we're familiar of how we can remove all the reviews associated with specific product. 69 00:04:59,300 --> 00:05:01,040 Once we delete the product.