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Hey everybody what's going on this is Caleb with slopes dot com.

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And in this video we're going to download that additional data that we need.

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The contributor's data as well as the avatar image and we're also going to set up some conditional safety

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checks to make sure that all the repositories that we are downloading have all the properties we need.

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If you remember in the last video we got a crash because one of the Repos did not have an avatar you

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or else so we're going to set it up so that when we download that data we're only going to get data

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that has all the properties we need and we can actually checked against that using guard Blatt which

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is really really really cool.

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So go ahead and pull open your X code project just like so and we're going to do that.

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Now we're going to make sure that everything is coming in the way we want.

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OK.

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So inside your trending repots dict array function we're going to go into the for loop here and we're

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going to go inside our if trending repots array count is less than or equal to 9.

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And this is where we're going to use guard let to ensure that every repo has the values we need.

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And we're going to use guard guard led to do that.

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So go ahead and type guard let And we're going to create an individual property for all of these.

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Remember these are all of the properties that we want.

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So I'm actually going to go ahead and unstick this because after we fix this we will no longer have

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a problem with these values coming in.

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So go ahead and copy this.

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OK we're going to use it up here and you're probably saying oh that's copying and pasting.

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Yeah that's true.

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But down here we're basically casting them as values in swift and then we're using them to create an

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instance of repo so it's different.

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But now what we can do is we can color guard let And the cool thing with a guard that is we can use

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a string and not a string but a we can use.

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OK.

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A long list of properties and we can put them into the same guard let so that we make sure that all

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of the values come back.

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Otherwise we're just going to return.

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So it's basically going to allow us to go through fill all the values.

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If there's a value for all of it it will create all of them if one is missing.

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It doesn't create any of them so it's a really cool safety check.

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But we need to basically put commas between them and that will help us to separate them.

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And let's do that now so we're going to go ahead.

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Last there for string.

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Let's go ahead and put a comma and a space and one more comment in a space.

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OK.

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Very cool.

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And after each comma we can actually go in and return these down.

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So it looks a little prettier.

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Right before the let.

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OK.

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Very cool.

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So it looks like we're getting avatar you are l a name description number of fork's language repo you

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RL.

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OK we have one more that we need.

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We need that contributor's data.

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So go ahead and put a comma.

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Let contributor's you RL And that's going to be equal to the dictionary.

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But then the contributor's you are a let's go find out what the key for that is.

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All right.

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So contributor's you r l I believe is just contributor's underscore u r l Paiste that n it's going to

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be of type string.

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K then do we have any other ones.

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We have a name description language for X repo contributor's data avatar you Arel.

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Hmm let's think

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well you know what actually I do notice something here.

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The avatar you are l is not a part of the big dictionary that we're looking at.

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It's part of another dictionary inside called owner.

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So what we can do is we can basically cast owner and then pull out the avatar you are l.

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We should do that to make sure that we don't miss something so I'm actually going to remove avatar you

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are l and move this guard let name property appear then below contributor's you or else I'm going to

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go ahead and paste that.

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But we need to first cast the owner dictionary from our our function here so to do that.

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Go ahead and beneath this just call Let owner dict equals dictionary.

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Whoops sorry dict.

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And that property is called owner.

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Right.

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But we need to cast this as a dictionary of string.

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And any.

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OK.

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Oh and one other thing you notice all these errors.

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Comma there to separate them.

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You'll notice we get a ton of errors and that's because inside of a guard light you're not allowed to

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force on wrap things you need to optionally cast them.

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So we need to actually change these all to optionals because basically a guard let works under the premise

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of these values are optional meaning if there is a value we're going to move forward if there's not

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a value we're going to return.

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So we need to make them all optional.

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And it looks like it's saying use of an resolved identifier dict and I don't know why that is.

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Oh that's because it's repo dict.

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My bad.

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I missed that the whole time that's why you don't copy and paste code folks.

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OK so we're going to copy and paste it like I'm doing here sorry being a bad example.

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Anyway so.

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OK.

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Check it out.

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We now have a property for repo dict.

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We have a property for all of these but remember owner DECT is now its own dictionary and the avatar

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you are l is inside of that.

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So we need to call avatar you are ELF from owner dict like so.

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All right.

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Now the interesting thing is since these are all connected with comma's we can call it else.

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And if all of these values do not come in if we miss even a single one we are going to go ahead and

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call break.

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And that means it's going to break out of the for loop or at least break out of this section of the

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for loop.

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OK that's pretty cool.

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So now assuming we've made it through and we have a value for every single one of these We're going

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to go ahead and create a dictionary.

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OK.

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And that's the dictionary that we actually should be appending to are trending repose.

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So let's go ahead and let's create Ribault dictionary.

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OK.

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Now you know what we should set an explicit type for this so that it knows that it is a dictionary of

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type string.

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And any.

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And now let's go ahead and let's build it.

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So the first key is going to be name right.

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That's great.

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And the name is going to come from the name property that we've already set.

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Next we're going to go ahead and just call description.

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And that's going to be from description.

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Next we're going to have a number of forks.

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Whoops that needs to be a key fork's underscore count.

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I'm going to use the same ones as the repository so that we don't have any issues and that's going to

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be set to be equal to number of forks.

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Next we're going to have language.

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And that's going to come from language.

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All right what's next.

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We have a few more we have let's see to do repo you RL.

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Whoops sorry.

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That's actually HVM l u r l underscore T.M. u r l and that comes from Ribault u r l.

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Then we have contributors you are l so let's go ahead and let's cast that contributor's underscore you

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are l.

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That comes from the property contributor's you are l.

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Then we have Avatar u r l and that comes from Avatar you are l.

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All right so there our dictionary that has all the values we need right.

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We have our contributors you are l we have our name description number of fork's programming language

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Ribault you r l contributor's you are l and Avatar your L we don't need owners dictionary because we

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just need the value of Avatar you r l so that looks pretty good.

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And now we can just go ahead and pass Ribault dictionary and we can pass that back to our function and

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this should work the same exact way.

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Now when we go through here we will definitely have an avatar u r l which is pretty neat and we will

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definitely have a contributor's you r l so you know what we can actually add in a property here for

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that.

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Let's just type let contributor's u r l equals dictionary and the value coming in is contribute towards

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underscore u r l as a string.

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Of course because it will be coming in as non-optional.

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And now we are good to go we can use these two to download the image and download the contributor's

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data.

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So let's go write those functions now.

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So go ahead and write above.

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Let's see.

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Well why don't we do this down at the bottom.

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We're going to go ahead and go below here and I'm going to type phunk download image for and it's going

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to be for a specific avatar you are l of type string.

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String string.

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There we go.

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And since it's really dependent since the order is very important we're going to use a completion handler

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so that each repository cannot move on until the function is finished in a very particular way.

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So go ahead and cut type completion and it's going to be escaping so we can pass the image back to where

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we want then we're going to create a function that returns an empty function and inside of this we're

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going to return an image and that's going to be wups of type II image.

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OK that's pretty cool.

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So give it some curly brackets.

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And now what we're going to do is we're going to use Alamo fire to pass in the avatar you Arel and return

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an image.

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So go ahead and call Alamo fire.

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Request and pass in the avatar you are l k.

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That's easy.

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Next we're going to go ahead and call daat response.

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Whoops can't type response response and you'll notice there is no particular way to return an image.

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But that is where Alamo fire image comes in.

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So go ahead and import that Alamo fire image.

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Very cool.

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And now watch what happens when we call response.

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You'll notice there is daat response.

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Image K and that that's going to return an image for us which is very cool.

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So on the completion händler go ahead and press enter and the image response is going to be of type.

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Data response so go ahead and type image's response.

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K and we're going to pull out the value inside that data response of type image.

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So for the image just in case we're going to be safe and use a guard lead and call image.

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We're going to set it to be equal to image response and watch what happens when I type a dot.

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We can pull out the result right here which you'll see the result casts an image inside.

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So to pull out the value is to pull out an image.

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Very cool so that's great.

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But this is a guard so we need to say if there is not an image.

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We're going to just return k.

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We don't want anything to happen or for us to have a crash so it can return nil which is really cool.

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So then what we're going to do is we're going to call our completion handler once it's downloaded we

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can pass the image like so to our completion handler and now it's done very cool.

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So this function will download an image for us from our avatar you are l.

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Next we need to get our contributors data and we're going to do this in a very similar way.

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We're going to call phunk download contribute tips and tribute Tyers data for contributors.

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You are l of type string.

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And for this we're also going to call a completion handler of type escaping and we're going to return

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an empty function.

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We're going to basically need a count of contributors so we're just going to use an underscore there

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since we're not allowed to use named types and we're going to just say contributors of type int.

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Right because that comes in as an integer value.

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So.

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Great let's think what do we need.

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We have a few RL contributors you know we need some curly brackets of course.

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OK so now let's use Alamo fire to basically pass in that you r l and see what happens.

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So go ahead and type.

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Alamo fire dot request wups Riku.

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And pass in contributor's you are l.

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Now we have not yet seen what happens when we call it contributor's you r l so let's be smart let's

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go find that u r l right here.

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And let's go ahead and paste pasted in.

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And let's check it out.

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So yeah.

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When we load it up you can see this is the list of all of the contributors by username that have contributed

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to swift which is pretty cool.

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You can see them all here.

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But as you can see they come in as well as an array of dictionaries so we can basically count the amount

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of dictionaries and that'll tell us the amount of contributors.

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There are two swift which is pretty cool.

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So we know that we can just call the count.

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But the cool thing is we know now that it is an array of dictionaries.

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That's going to help us avoid crashes.

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So let's go ahead and let's call Alamo Firedrake quest and we're going to get the response in Jaison

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just like you might have expected.

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And let's go ahead and press enter on the completion handler and call this the response which is the

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Jaison response.

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Let's be safe and let's use guard let Jaison and just like before we're going to use response.

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Got results.

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Results don't value.

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And we're going to cast that just like we saw as an array of dictionaries and we don't know always.

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We know all the keys are strings but we do not know that the type will not be any.

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So we're going to be safe and just say string and any otherwise we're going to just go ahead and return

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nothing perfect and we'll just quit out.

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But we should get some day sun and let's just make sure that there is.

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I mean just because there's a contributor's you are l doesn't always mean that there are contributors.

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So if our Jason that comes in we can call Dohm is empty.

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OK.

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And if it's empty then we're going to go ahead and do nothing but we're going to do the opposite.

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So if the opposite of Jason is empty meaning if there is Jaison what we're going to do is we're going

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to go ahead and just create a contributions value and just basically say let contributions equal Jason

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count.

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All right so that's going to be the amount of items in the dictionary will tell us how many contributors

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then we can call our completion and pass in contributors or can contributions I guess.

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So now that function is finished now we need to string them together and set it up so that we can properly

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create these repositories that we need.

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So let's go ahead and head back up to our trending repo function.

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And here we go.

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So when we create this repository we're passing it in a temporary image and a temporary contributor's

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you r l so we need to call it beforehand.

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So let's go ahead and call download image for Avatar you Aurel pass in the avatar you are ill and upon

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completion we have a returned image.

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OK then we're going to go ahead and call our download contributor's data.

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But now that we're inside a closure we need to call self download contributor's data for contributors.

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You r l pass in that value.

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Then upon completion we get returned contributions.

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So now we have access to both of these returned image and return contributions.

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So we can go ahead and take this repo cut it and pasted in here.

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And for the image I can set returned image.

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Oops I missed my comma there.

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And for the contributors I can set.

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I guess it's returned contributions.

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There we go.

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Returned contributions.

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Very very cool.

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So and then at the very end what I can do is I can return that repo.

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But you know what you're going to notice there's a problem.

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Unexpected non void return value in void function.

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That's because when we're using closures you cannot return out of a closure you get trapped and that's

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why it's super important to use a completion handler with an escaping closure.

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So get rid of the return.

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And what we're going to do is we're going to go ahead and call completion make it escaping.

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We're going to.

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Whoops.

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Looks like I missed that.

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We're going to pass in a function return an empty function.

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And remember underscore for the property and what we're going to return this function is just a repo

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right just like we were returning.

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But we need to just type Ribault of type Ribault and we create one here so we can call our completion

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handler in the same place and pass in repo.

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So now as we go through we'll get all the values we'll download the image contributor's data and return

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the completed repo.

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That's exactly exactly what we want.

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So it looks like we are getting an issue here.

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It's saying we're missing our parameter here so I'm going to actually rewrite the function to show you

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what it should look like.

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We're going to call self-direct download trending repo K from dictionary and that is dict as we passed

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in from our for loop and the completion handler.

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We're going to get a returned repo.

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Right.

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And that is where we can append our returned repo to our returned repots array.

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But we're not passing in the proper repo.

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So we're going to go ahead and call download trending repo but you'll notice it's all exed out.

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And that's because we are setting it as a property which we needed to before but now we don't.

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So go ahead and just pass in the dictionary and on completion we're going to just get a returned repo.

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Remember right here in our function we pass in the repo to the completion handler once we have the image.

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Once we have the contributor's data and now inside here we can append our returned repo.

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So instead of returning that repo return the returned repo.

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OK.

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So that will go through.

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That will all do its thing.

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And then at the very end once this for loop is finished we will return the whole array back to wherever

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we call this.

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So let's go ahead and let's try it out.

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Let's go ahead and call download service instance download.

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Let's think what was it.

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Download a trending repo's I believe it's going to actually return all the values we need.

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This will be read.

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Well let's just call it repots array and we'll print out repots array dashes zero and we're gonna take

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the image and I'm going to print out the size because if we actually get a real image should print out

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a size for us so let's go ahead and build and run.

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Let's go test this we're doing a lot of kind of finicky data stuff but to make sure that we're casting

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it properly we're going to just see how we do.

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Let's let's go ahead and check it out.

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OK.

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So we're getting a problem here.

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It's saying unexpectedly found nyl while unwrapping an optional value.

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What we're going to do is we're going to head over to the next video and we're going to troubleshoot

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this.

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We're going to figure out why we're getting optional values why things aren't coming in the way we want

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and we'll see in the next video.

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So let's head over to the next one and let's fix this problem.