All language subtitles for 009 CRUD_ Deleting Documents_Downloadly.ir_en

Finally, let's learn

how to delete documents in MongoDB.

So just like before,

we have delete one to delete one single document,

and we have delete many, well,

to delete multiple documents at the same time.

Alright, and just like before,

delete one will only work

for the first document matching your query.

And delete many will of course

work for all the documents matching your query.

Okay.

Just to get an overview of what we have here

at this moment in time,

let's do a find of all the tours.

And what I'm gonna do now

is to delete all the tours

which have a rating less than 4.8.

So that's gonna be just the first one

but if we had multiple tours with that condition,

then all of them would be deleted.

So db.tours.deleteMany.

So the condition is rating...

Open a new object

so that we can use the less than operator and 4.8.

Close it and then close this one.

And run this and here we see that it's deleted one document.

Right away it's telling us here

how many documents were affected by this operation.

So if we do this find now,

well then the first one that we had is gone.

Alright, so that's no problem.

We are only really using this here to play around

and so we can delete as much as we want here.

No problem.

Now if you wanna delete

all of the documents in the collection,

you would do it like this.

So deleteMany.

And I'm not gonna execute this.

But you would do it like this.

So all you have to do is pass in the empty object

because the empty object is basically a condition

that all of the documents always match.

It would be like simply using an empty object here in find.

I'm not gonna do that

and you should be careful with it,

especially when doing it in a real app

because you cannot come back from this operation.

So unless you have some backup in place,

this will effectively delete all the documents

in your collection,

in this case the tours collection.

So I'm not performing that.

I just wanted to show you

that this is how we delete everything.

So this is the simplest operation

and we don't use it all that often.

But I just wanted to have a short video

just to demonstrate that it also exists.