1
00:00:02,170 --> 00:00:09,430
So now that we can store products and fetch all products, let's work on getting a single product. And

2
00:00:09,520 --> 00:00:12,300
for that, we can use our get route here,

3
00:00:12,550 --> 00:00:18,280
this parse is basically an ID which is encoded in the url, if we view the details here, you can see

4
00:00:18,280 --> 00:00:19,820
that url here,

5
00:00:19,840 --> 00:00:26,230
that is the ID as it is stored in mongodb and therefore, we can use that ID to fetch our product of

6
00:00:26,230 --> 00:00:27,450
course.

7
00:00:27,550 --> 00:00:36,340
Hence what I want to do here is I'll reuse my code here with find to find that product and replace

8
00:00:36,340 --> 00:00:38,440
that dummy code here with that code,

9
00:00:38,440 --> 00:00:44,220
however I'll not use find but find one because of course, I know that I will only find one product here

10
00:00:44,350 --> 00:00:48,660
for a given ID but that is a filter which I need to add here.

11
00:00:49,030 --> 00:00:55,240
Now I want to search for ID being equal to that ID and for that, I need to get access to the objectid

12
00:00:55,930 --> 00:01:01,810
object so I'll name that constant objectid and import it from mongodb, object ID.

13
00:01:02,050 --> 00:01:09,660
So just as I created a decimal 128 object, I can also create my own object IDs which mongodb understands.

14
00:01:09,660 --> 00:01:13,440
So now this is stored in this constant and down there,

15
00:01:13,880 --> 00:01:16,070
I can simply use that with the new keyword,

16
00:01:16,100 --> 00:01:20,800
so the objectid is a so-called constructor, a function in Javascript

17
00:01:21,020 --> 00:01:22,820
and there I can pass in a string.

18
00:01:22,820 --> 00:01:28,340
Now that string is basically extractable from the url with the help of express which is the node

19
00:01:28,400 --> 00:01:32,420
framework I'm using here with request params IDs.

20
00:01:32,420 --> 00:01:34,680
So this gives me access to the request parameters,

21
00:01:34,730 --> 00:01:41,780
so the data encoded in the url and then, I'm extracting ID because I named it ID here and that is then

22
00:01:41,780 --> 00:01:46,670
passed to this constructor which gives me an objectid object which mongodb understands.

23
00:01:46,670 --> 00:01:49,280
Find one then returns a promise, 

24
00:01:49,280 --> 00:01:56,810
so I have catch and then. In the error case, I'll reuse my error code from down there and simply send an

25
00:01:56,840 --> 00:02:06,860
error response, in the success case I should get my project, my product document and then I can return

26
00:02:06,980 --> 00:02:10,270
this with status code 200 for

27
00:02:10,280 --> 00:02:13,780
I got something and simply pass it as

28
00:02:13,830 --> 00:02:15,990
json data to my frontend,

29
00:02:16,130 --> 00:02:20,490
so now this should be some code that works and allows me to fetch a single product.

30
00:02:20,630 --> 00:02:28,730
If you save all files, you can restart your backend server and now try reloading that page,

31
00:02:30,440 --> 00:02:35,470
now it almost works but I get an issue regarding the number decimal.

32
00:02:35,610 --> 00:02:42,350
Well the problem here is that a single product has its price stored as a decimal, decimal 128 bit and

33
00:02:42,350 --> 00:02:43,940
therefore, I need to convert it,

34
00:02:44,030 --> 00:02:52,580
so I will simply set product doc price equal to product doc price toString, what we already did earlier

35
00:02:52,970 --> 00:02:55,530
just to make sure that this is handled correctly.

36
00:02:55,580 --> 00:03:00,330
After this little addition, we can restart the backend server once again

37
00:03:00,500 --> 00:03:05,820
and now if we reload that front page, we see the product data on the detail page.

38
00:03:05,820 --> 00:03:11,160
So now fetching all products is working, fetching a single product is working, now

39
00:03:11,210 --> 00:03:13,020
of course adding products is working,

40
00:03:13,040 --> 00:03:16,260
now I want to make sure that editing and deleting works too.

41
00:03:16,340 --> 00:03:18,060
So that is what I'll work on next.