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Hey, there!
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So let's now learn how to read documents with Mongoose
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in order to implement or get tour and get all tour's
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route handlers.
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And starting with the getAllTours handler.
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So first off, let's delete this piece of code here.
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And now what we're gonna do
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in order to get all the tours from the database
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is to use Tour.
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So the model again.
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At the end on there, we use the find method.
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All right.
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So remember from the MongoDB intersection,
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where when we wanted to query for all the documents,
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we simply used find, okay?
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And so here, it's the exact same method.
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And again, when we don't pass anything into it,
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so just like we're doing here,
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then it will return all the documents
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in that collection, okay?
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So in this case, in the tour collection obviously.
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Now just like before, this is gonna return a promise
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that we will await.
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And since we wanna await,
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we need to make this an async function.
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So async.
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Then here we can await, and save the result into tours.
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All right.
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And that's actually it.
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So, let's get rid of these comments here.
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We also don't want the requestedAt property.
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So that was just for testing before.
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And so, yeah, I think that's it.
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So this is how we get all the tours
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from the Tour collection.
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So using find, then awaiting that result,
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and then sending it down here.
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So remember that we have this data property here
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to basically envelope the tours.
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And then we also send this property here,
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which simply measures the number of results
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that are in the tours, all right.
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Okay?
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Because of course, this find method here
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will return an array of all these documents,
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and will also very nicely convert them
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into JavaScript objects, okay?
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So this function here, this find method,
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really does all the work for us.
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Now just like before,
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one more step before we can actually try this out,
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which is to wrap all of this here in the try block
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and then catch any potential errors.
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Now in this case,
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there are not gonna be any validation errors like before.
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But let's still send an error here, in this case,
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and let's just make it a 404.
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And it doesn't really matter so much at this point
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because again, we are gonna implement
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some better error handling here
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in the next, or in one of the next, sections.
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All right?
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So let's just set it here to status: 'fail',
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and the message to whatever error that we might get here.
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Okay.
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So, let's test it out now.
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It's this one, Get All Tours.
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And, yup, it works.
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So here we have the array of the three tours
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that we currently have in our database.
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Perfect.
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So next up, let's implement the getTour handler.
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So let's write the next one that we have here.
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And let's get rid of this code,
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and this code.
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All right.
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And this one is actually gonna work in a very similar way.
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So I'm still doing this try catch here.
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So error, like this.
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Because we're still using async await in this one.
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So async.
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Because now in order to find one tour,
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we are still going to be awaiting Tour.find.
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But it's not gonna be just find,
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but instead we're gonna use findById, all right.
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So findById, but where is that ID actually coming from?
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Remember that?
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So let's actually take a look at the route.
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So going back here to Postman,
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this is how we call this end point,
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oh, let's actually put a more real ID here already.
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So, for example, this one
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from The Park Camper.
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And so our request might come from a route like this.
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And so here, we have this ID parameter
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right in our route, right?
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So let's take a look at our router here.
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And so remember that this is how we specify it,
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the ID in the URL.
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So this ID is gonna be part of the request obviously.
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And so how do we actually get access to that ID here,
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and this handler?
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Well, we do req.params,id.
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And it is ID
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because that's what we called this variable here, right?
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If it was name here,
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then here we had req.params.name, right?
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Remember that?
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And now, let's save that to tour.
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Now all right.
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Then let's get this code here back.
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Copy it here.
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And then also this one for the error block.
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And don't worry, I'm gonna explain this function here
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in a second.
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I just wanna finish this code here first.
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So this piece of code here is gonna be exactly the same
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for this catch block.
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Give it a save now,
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and so we get no errors here from eslint.
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Now about this find ID method here,
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well, remember how up here we just used find, okay?
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So find is to find all of the documents.
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And then we also have findOne
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to find only one document, okay?
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And so this findById is really just a shorthand,
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so a helper function for,
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let me write it here as a comment,
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for writing findOne,
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and then with the filter object,
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which is exactly like we learned
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in the MongoDB intersection.
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So we have the ID field.
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And then we could set that to req.params.id.
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So this here would work the exact same way as this, okay?
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So _id, because that is what the ID looks like.
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So MongoDB is called _id.
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And we could of course query for that field, right?
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We did exactly that in the last section.
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So we specified this filter object here,
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and then the property that we're searching for,
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and then the value that we want to search for.
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So exactly the same again, as we did in the last section.
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And this findOne method here
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will then only return one of the documents.
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Now this findById, as I mentioned before,
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is simply a shorthand for having to write this.
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So behind the scenes, it's gonna do exactly this.
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But Mongoose simply wants to make our life easier.
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And therefore, gives us access to an easier method
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called findById,
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which simply expects the ID that we're looking for.
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All right?
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So let me actually leave that here, just as a reference.
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And so now, this would actually work already.
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So, let's take a look at that.
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So we already put the ID of this tour.
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I think it was this Park Camper.
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So ac2.
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And ac2, that should be The Park Camper,
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and indeed, it is.
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Great.
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And that is the easiest way of finding
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or of querying documents from the database.
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There is a ton more that we can do with queries,
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and we're gonna do all of that
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once we start implementing something like filtering
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or sorting or pagination,
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and all that good stuff a bit later in this section,
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so in a couple of videos from now.
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At this point though,
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it's enough to simply return all of the documents here
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in this route handler.
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And then here, simply the one for the matching ID.
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And that works now,
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and so let's move on to the next one.
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