1
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Now before we continue with other operators, one more word about $set,

2
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I only used it to change one field at a time.

3
00:00:12,320 --> 00:00:14,450
Now Chris can still need some work,

4
00:00:14,450 --> 00:00:17,490
we can add a phone number and an age,

5
00:00:17,540 --> 00:00:23,350
so again I will take the objectId of Chris and then I will use update one again

6
00:00:23,360 --> 00:00:29,520
and of course by the way, I could also use update many even if I know only one document will be affected

7
00:00:29,990 --> 00:00:32,800
but update one is clearer about my intention

8
00:00:32,960 --> 00:00:34,610
and since I filter for the ID,

9
00:00:34,730 --> 00:00:38,510
it's pretty clear that there will be only one document that matches.

10
00:00:38,600 --> 00:00:45,100
So I filter for Chris here essentially and I use $set again to describe the changes to that document

11
00:00:45,380 --> 00:00:53,440
and now here, I will actually change multiple fields, so I will set the age to let's say 40 and I will

12
00:00:53,440 --> 00:00:59,840
set the phone number to some random number, like this. If I now hit enter,

13
00:00:59,860 --> 00:01:00,520
you'll see again

14
00:01:00,520 --> 00:01:02,980
we found one document, we updated one document,

15
00:01:03,070 --> 00:01:08,380
if I have a look at all my documents, you see age and phone was added to Chris now.

16
00:01:08,740 --> 00:01:13,170
So $set is of course not limited to updating only one field,

17
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it can update as much as you want on the document.

18
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It can add arrays as you saw previously with the hobbies array,

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it can add embedded documents as you saw with documents in the array,

20
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of course it can also add embedded documents outside of arrays,

21
00:01:27,850 --> 00:01:30,470
so it gives you the full flexibility

22
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you also have in your inserting documents, just that it either adds a field or simply, well edits it.