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‫After get and post, let's all learn

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‫how to handle patch requests

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‫to actually update data.

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‫And I'm pretty sure that at this point,

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‫you already have a good idea

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‫of how we're going to do that.

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‫So let's do that after post,

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‫so down here,

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‫and remember that we actually have two http methods

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‫to update data.

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‫We have put and we have patch.

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‫And with put, we expect that our application

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‫receives the entire new updated object,

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‫and with patch, we only expect the properties

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‫that should actually be updated on the object, all right?

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‫So usually, I like to use patch,

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‫because I find it easier to simply update the properties

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‫that were updated.

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‫At least, when we start using MongoDB and Mongoose,

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‫it will be much easier to just do it like that, all right?

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‫And it's alsp easier for the user

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‫to simply send the data that is changing,

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‫instead of having to send the entire new object.

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‫So again, we are going to make our app work

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‫for patch and not for put.

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‫So we expect a patch request to come in on the URL

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‫just like before, "api/v1/tours,"

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‫and now we actually also need the ID

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‫of the tour that should be updated.

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‫And so that is slash and then "id."

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‫Okay, so that's what we learned in the last lecture.

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‫So, what do we want to do when there is a patch request,

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‫so when we want to update the data?

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‫Well, actually, I'm not really gonna implement

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‫this operation here, because that's just a matter

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‫of writing some more JavaScript

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‫that is not really important,

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‫because, again, this is just testing API-using files.

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‫In the real world, we're never gonna use files for that

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‫anyway, okay.

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‫So, I'm really just implementing all of these verbs here

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‫so that you get a good idea of the different verbs

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‫that we use with http,

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‫the kind of status codes that we send back,

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‫for example, here we sent 201,

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‫while here we sent 200 and 400,

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‫and also for example, here,

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‫when we had multiple tours, we sent the results,

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‫and when we created a new tour, we sent that data back

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‫immediately, with this newTour that was created,

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‫and so that's the kind of stuff that I want you to learn

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‫for now, in this section.

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‫So the basics of working with the Express, of course,

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‫and also, the correct way of sending back API responses,

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‫okay, and so, again, I'm not going to implement the updating

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‫of tour here, because that would be a lot of work,

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‫you would have to get tour from the JSON file,

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‫than change that tour and then save it again to the file.

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‫And that's a bit too much work here,

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‫and so let's simply go out

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‫and send back a standard response.

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‫So "response.status,"

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‫and we will still use 200 here,

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‫so when we update an object or a resource,

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‫we send back 200, okay,

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‫and then the usual JSON

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‫with the status of success.

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‫And then we send back the data, and in this case,

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‫the updated tour.

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‫So we say "tour," and then here, in this position,

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‫we would send back the updated tour, okay.

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‫Right now, I'm going to send back a string which says like,

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‫"updated tour here...," something like this.

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‫So basically, just a placeholder here.

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‫And we can also kind of implement this code here,

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‫so in order to only send this when the ID is actually valid,

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‫so let's get that from here,

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‫and so this way, we can also actually use this ID here.

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‫Right.

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‫So we're not gonna do this one

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‫because we don't have any tour, but we will use this one.

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‫So this will be "req.params.id,"

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‫and I'm converting it to a number here as well, times 1,

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‫and if it is greater than the tour's length,

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‫well then just like before, it is an invalid ID,

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‫and we send a 404, for not found.

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‫And so like this, we should now be ready to test it.

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‫So, let's first of all save the request

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‫that we did in the previous lecture.

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‫So, just "Get Tour."

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‫And I'm just going to go ahead and copy this one here.

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‫And let's specify the patch method.

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‫So this one's patch, and I will save it here right away as

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‫"Update Tour."

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‫Okay, and you see this one here gets this gray text,

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‫so they're very easy to distinguish here

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‫in this side column.

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‫So we actually should specify some body here,

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‫so let's just go ahead and copy it from here,

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‫so remember, body, raw, and then JSON,

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‫just like this,

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‫and so, let's say that all that I want to do

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‫is to change the tour number three, let's say,

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‫so let's take a look at that one, so, one, two, three,

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‫and I want to change the duration to fifteen.

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‫Okay. Saving it again.

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‫I'm going to save this one as well,

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‫because then it will actually save this text here in a body,

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‫and if I close it and open it up again later,

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‫then all this text here is back,

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‫and that will make my life a lot easier then.

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‫Okay, but anyway, back to this one.

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‫We set the duration to fifteen.

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‫Now, keep in mind, that this will of course

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‫not change anything in the data

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‫because we did not implement that.

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‫Okay, so I'm sending the response now.

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‫{\an8}And so, here we see "updated_tour_here...,"

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‫{\an8}just in the place where in the real world

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‫{\an8}we would then get the updated data back.

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‫Right, just to test it with a wrong ID,

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‫{\an8}we get this "fail," and this "Invalid ID."

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‫Okay, so give it a save and close it up,

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‫and I'm going to close up this one as well.

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‫Okay, so almost done with the CRUD operations,

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‫so create, read, update, and delete, and as you can hear,

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‫the last one that's missing is delete,

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‫and so let's take care of that in the next video.