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‫Let's now start creating documents,

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‫testing the model, and really start using Mongoose.

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‫And I'm really excited about this video,

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‫so really let's get started here.

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‫So what we're gonna do is to create a new variable,

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‫and I'm gonna call it testTour,

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‫and this will be a new document

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‫created out of the tour model

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‫that we created in the last lecture.

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‫So what we're gonna do

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‫is to say new Tour,

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‫and then in there pass an object with the data.

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‫So name, let's say,

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‫again, 'The Forest Hiker,'

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‫just as we've been using before,

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‫then the rating, let's say 4.7,

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‫and then the price,

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‫let's say 497, okay?

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‫So, this is, again, a new document

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‫that we created out of a tour model,

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‫or function constructors,

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‫and so as I said before, this is kinda

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‫using JavaScript function constructors,

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‫or JavaScript classes if you're using ES6,

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‫basically to create new objects

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‫out of a class, right,

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‫and so that's exactly the same syntax, actually,

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‫so we use the name keyword,

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‫and then the class name in ES6,

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‫just like this, all right?

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‫Now here, it's not exactly the same,

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‫but this analogy is helpful

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‫to understand how this works.

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‫So this test tour document that we just created

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‫is an instance of the tour model,

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‫and so now it has a couple of methods on it

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‫that we can use in order to

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‫interact with the database.

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‫So let me show that to you.

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‫So we can now say testTour.save,

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‫and this will then save it to

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‫the tours collection in the database, okay,

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‫and it's really as simple as that.

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‫So again, we have our document instance

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‫which is testTour, and on there

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‫we can then call the save method

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‫in order to save the document to the database.

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‫Now this save here will then return

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‫a promise that we can then consume.

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‫So for now, let's use then for that,

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‫and in the future, we will actually use

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‫async await in order to consume these promises,

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‫but for now, let's keep it simple

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‫and not create any more functions,

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‫and so instead, we're just using

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‫the then method here.

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‫So in here, we get access to the document

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‫that was just saved to the database.

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‫So, basically, the result value of the promise

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‫that the save method returns is

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‫the final document as it is in the database.

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‫And so let's now actually go ahead

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‫and log the document to the console, all right?

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‫Now, on the other hand, saving this document

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‫to the database might also go wrong,

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‫and so let's catch that error, okay?

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‫So just like before, we used the catch

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‫method in order to catch any potential errors,

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‫and so if there is an error when

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‫saving the document to the database,

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‫we will be able to catch that error

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‫here in this method.

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‫Okay, so basically, here in this function

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‫that I'm passing into catch.

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‫Okay, for now, all I wanna do, really,

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‫is to also log it to the console.

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‫Let's say, 'Error,' add some emojis here

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‫to make it more visible in the console,

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‫and then we can pass in a second argument

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‫into the console log, which will

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‫then be the error, okay?

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‫Are you ready?

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‫Then, let's give it a save now,

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‫and that will then execute the code that is in here,

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‫so basically create this new tour, and try to save it

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‫to the database right away, okay?

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‫So, let's give it a save now,

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‫and see what happens in the console,

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‫and indeed, here we go.

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‫So you see, that this is the document

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‫that was just saved to our database, all right?

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‫So here we actually see the ID as well,

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‫and that is simply auto-generated by MongoDB,

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‫and it's simply the unique identifier for the document.

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‫So just like it happened before in the MongoDB section,

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‫we automatically get this unique identifier

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‫for the new object.

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‫Then Mongoose also automatically adds

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‫this V, and set it to zero here,

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‫but that's not really important at this point, okay?

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‫What matters here is that our new document

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‫was actually successfully added to the database,

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‫and just to make sure, let's actually move over

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‫to Compass and take a look at our database there.

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‫So here, we have the tours collection,

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‫and then we have the document that we just created.

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‫So it has that exact same ID, and of course

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‫all the other data that we put in there,

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‫and so indeed, this is the object

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‫that we just created.

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‫And keep in mind that we had actually deleted

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‫the tours collection here in one

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‫of the previous videos, right,

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‫but Mongoose automatically created

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‫this new collection here as soon

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‫as we created the first document

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‫using the tour model,

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‫and so this name here basically

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‫comes from that tour model, it simply

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‫gives us this plural name, just as we had before.

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‫Perfect, we just made our express application

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‫really interact with a MongoDB database

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‫for the very first time,

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‫and that's actually really amazing, if you ask me.

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‫So this means that right now,

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‫we are able to create documents right from our code.

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‫So, that makes me really happy,

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‫and so let's actually try it again

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‫with another one, all right,

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‫but actually before we do that,

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‫I want to just reload this file here

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‫which will then try to save this document here

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‫to the database again, right,

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‫simply because all this code here is run

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‫each time that we save the file.

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‫Now, let's try to guess what is gonna happen

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‫as soon as I save this file.

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‫Can you guess?

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‫Let's wait for it,

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‫and indeed we get something different now,

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‫we get an error here,

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‫and the error that we see is this

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‫duplicate key error collection,

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‫which down here says this duplicate key, okay?

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‫So we already have a tour with the name

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‫of 'Forest Hiker,' and so now we were

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‫trying to create another one,

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‫and since in our schema we have this

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‫unique property here, that is not allowed,

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‫remember that?

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‫So we set this unique here to true

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‫in order to make it impossible

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‫to have two tours with the same name,

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‫and so we just proved that this is actually working.

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‫All right, so let's simple replace

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‫the code that we have here

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‫in order to create a new tour with another name.

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‫Let's call it 'The Park Camper,'

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‫and let's go ahead and remove the price

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‫and also the rating.

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‫So, can you guess what's gonna happen now?

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‫Let's actually clear, or actually it

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‫already loaded it because as soon

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‫as I clicked here, it then saved the file,

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‫and so, yeah we just got another error,

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‫so you can see that up here,

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‫meaning that we didn't successfully save

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‫this document to the database,

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‫and what we got here now is a validation error

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‫coming from the price field

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‫saying 'A Tour must have a price,'

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‫and so that is exactly the message

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‫that we specified up here, right?

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‫Simply because in this line we said

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‫that the price is a required field, all right,

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‫and so this required, as I mentioned,

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‫is a validator, and so down here,

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‫we then get a validation error.

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‫And so let's now fix that

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‫and specify the price, let's say 997,

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‫and give it another save.

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‫Now this time, it should work

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‫because the rating is not required,

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‫and so when we come down here,

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‫our document was actually successfully

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‫saved to the database, you see?

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‫Now, we didn't specify the rating here

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‫in this test tour, but you see it's still 4.5,

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‫and that is because we set

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‫the default to 4.5 up here.

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‫So I just wanted to show you

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‫that here in this quick example.

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‫Okay, so we were successful again,

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‫so let's come back here, reload,

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‫you're clicking this button, and indeed

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‫we now get our two tours.

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‫Great, and I remember how amazing it felt

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‫for me when this worked the first time

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‫when I was starting to learn Express and Mongo,

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‫and how to build these applications,

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‫and so I really hope that you're

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‫feeling the same way right now,

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‫as you just created your very first

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‫documents using Express

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‫and, of course, MongoDB.