1 00:00:00,120 --> 00:00:00,490 All right. 2 00:00:00,510 --> 00:00:07,980 And just to give you a better understanding of how and why we need to set up Group Barney, we show 3 00:00:07,980 --> 00:00:10,230 you a small example. 4 00:00:10,740 --> 00:00:13,320 So first, what I want you to do is go back to the post, man. 5 00:00:13,320 --> 00:00:17,190 Now technically, you're going to sit back and relax and just watch me do it. 6 00:00:17,190 --> 00:00:25,110 But if you follow along and go to the post man logging as all three users on my case, I'll start with 7 00:00:25,110 --> 00:00:26,790 John Answers and then Peter. 8 00:00:27,360 --> 00:00:32,340 And then for all of them, I want to create a review for the same product. 9 00:00:32,970 --> 00:00:36,780 And in this case, I'll leave to review the same as far as the rating. 10 00:00:37,560 --> 00:00:42,750 So let's say to your will be with five and then one will be with one or however you want. 11 00:00:43,200 --> 00:00:47,670 But effectively that is that two ratings are the same and then one is different. 12 00:00:48,090 --> 00:00:51,450 So in my case, I'll leave five and I'm going to log in as. 13 00:00:52,530 --> 00:00:53,070 Susan? 14 00:00:54,510 --> 00:00:59,850 And I'll leave the same review five and then I'll logged in as Peter. 15 00:01:01,820 --> 00:01:09,950 Theater, and in this case, I'll leave the review of one of two fives and nine one one one if I take 16 00:01:09,950 --> 00:01:10,970 a look at all the reviews. 17 00:01:11,510 --> 00:01:13,430 I should have three, correct? 18 00:01:13,760 --> 00:01:16,780 Again, like I said, we have cheer with five and none. 19 00:01:17,150 --> 00:01:18,260 One, We're the one. 20 00:01:18,500 --> 00:01:20,480 Then I want to go back to the mango. 21 00:01:21,860 --> 00:01:26,090 In a database refresh, just so I and start from scratch. 22 00:01:26,840 --> 00:01:31,670 And we're looking for our reviews collection, that's step number one. 23 00:01:32,090 --> 00:01:41,340 Then we'll go to aggregation and after that we will set up a grouping we're all group based on rating. 24 00:01:41,810 --> 00:01:48,890 And that's when you actually see that group party in action because at the moment I have been saying 25 00:01:49,280 --> 00:01:51,270 all this time when it comes to group party. 26 00:01:51,290 --> 00:01:55,700 In our example, I could have went, but no, I could have one with product. 27 00:01:56,030 --> 00:01:57,170 It didn't make a difference. 28 00:01:57,200 --> 00:01:59,750 So here I am in the reviews, correct. 29 00:02:00,020 --> 00:02:02,870 And specifically, I'm going to go to aggregation. 30 00:02:03,320 --> 00:02:05,360 I have three documents, correct? 31 00:02:05,750 --> 00:02:09,410 And first, what we want to do first stage do we want to set up is the match. 32 00:02:09,800 --> 00:02:11,830 So for some reason, it just takes ages. 33 00:02:11,850 --> 00:02:15,890 My apologies and I'm going to right away, go to match. 34 00:02:16,340 --> 00:02:17,600 And what am I looking for? 35 00:02:17,900 --> 00:02:26,800 Well, again, I'm looking for all the reviews where product property is equal to the hardcore value, 36 00:02:26,810 --> 00:02:27,170 correct? 37 00:02:28,040 --> 00:02:32,510 And again, all my three reviews point to the same product. 38 00:02:32,980 --> 00:02:34,640 So here I go with objectivity. 39 00:02:35,710 --> 00:02:36,970 And then I want to get it. 40 00:02:37,510 --> 00:02:40,510 So where is the product, where it is? 41 00:02:40,660 --> 00:02:41,860 So let me take it. 42 00:02:42,790 --> 00:02:46,960 And once they match all the products on right hand side. 43 00:02:47,080 --> 00:02:47,360 Yep. 44 00:02:47,530 --> 00:02:49,750 We'll have a sample off three documents. 45 00:02:50,200 --> 00:02:51,880 And now let's add that grouping. 46 00:02:52,510 --> 00:02:55,930 Let's go over it one more time where I'm going to go with add stage. 47 00:02:56,860 --> 00:02:59,410 And then let's set up the group. 48 00:02:59,860 --> 00:03:08,020 And as far as the ad, again, since I got all the reviews that are associated with that product, it 49 00:03:08,020 --> 00:03:10,750 doesn't really make a difference whether I go here with. 50 00:03:11,760 --> 00:03:12,300 No. 51 00:03:14,010 --> 00:03:16,320 No, because I'm not using it. 52 00:03:16,770 --> 00:03:23,970 I'll still get back basically that one response or I'm going to go with product, sir, if you'll set 53 00:03:23,970 --> 00:03:27,930 it up over here as product response is going to be exactly the same. 54 00:03:28,020 --> 00:03:28,500 Why? 55 00:03:28,860 --> 00:03:34,350 Well, because every product is the same in all my documents. 56 00:03:34,980 --> 00:03:37,560 Now where is this going to make sense? 57 00:03:38,100 --> 00:03:40,920 If, for example, you want to count? 58 00:03:42,120 --> 00:03:47,430 How many reviews you have with specific rating for that product? 59 00:03:47,910 --> 00:03:48,970 How we would do that? 60 00:03:48,990 --> 00:03:53,520 Well, in that case, my group already is going to be a rating. 61 00:03:53,910 --> 00:03:59,340 So instead of product, I'll say, yep, group them based on rating. 62 00:03:59,910 --> 00:04:02,340 I'm in each group I want to count. 63 00:04:02,400 --> 00:04:08,400 Notice how right away I get back to documents because remember we were getting back what we were getting 64 00:04:08,400 --> 00:04:09,150 back the right. 65 00:04:09,780 --> 00:04:10,230 Correct. 66 00:04:10,650 --> 00:04:13,560 So in this case, we are getting two documents. 67 00:04:14,050 --> 00:04:19,860 And since we are getting two documents, what that means is that this one is four five. 68 00:04:20,250 --> 00:04:25,620 So this is going to reflect all the reviews where the rating is five and this is for one. 69 00:04:25,980 --> 00:04:29,070 And again, the key difference here is that ratings changing. 70 00:04:29,460 --> 00:04:34,320 I like the product, which is going to be exactly the same since I'm already matched all the ratings 71 00:04:34,680 --> 00:04:36,010 based on that product. 72 00:04:36,030 --> 00:04:37,130 So hopefully that is clear. 73 00:04:37,140 --> 00:04:42,480 And just to make it extremely clear, I'm going to add a some property. 74 00:04:42,750 --> 00:04:47,850 We need to go with curly share and then let's just use some. 75 00:04:47,850 --> 00:04:49,890 And you know what, I'm just going to call this amount. 76 00:04:50,340 --> 00:04:58,800 So now what I want to count is how many reviews I have with that specific rating for that specific product. 77 00:04:59,100 --> 00:04:59,910 And now check it out. 78 00:05:00,600 --> 00:05:04,920 I have two ratings with five just correct and then one with one. 79 00:05:05,610 --> 00:05:06,780 Hopefully this clear. 80 00:05:07,170 --> 00:05:16,080 Hopefully I was able to explain where this idea group comes into play and why in our case, we can either 81 00:05:16,080 --> 00:05:21,810 go with now or we can go with product, and the result is going to be exactly the same.