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Welcome back everybody Johnny be here with Davis dot com.

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And in this lesson we are going to pick up right where we left off and we are going to to that next

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step in creating a user which is to log in the user case so we have our register user function right

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here and now we are going to create our logging functions so right below it I'm just going to say phunk

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log in user.

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OK.

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And before we get started let's go ahead and check out our post man request here.

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We finished up the register user.

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Now let's check out the logged in user.

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And you'll see that it's pretty similar.

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It has the same header type and actually has the same body type as well.

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The URL is different.

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So I actually go ahead and create are you are logging you rl right now.

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Going a copy of this account slash loggin and let's jump back into Constans And here we're going to

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need a new you or else you want to say let your child log in log in equal in a string and interpolate

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the face your L and then add on a counter slash logon.

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And just to reiterate once again these your L's are going to a specific location on the API.

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And and so that so that the API knows what to do with the specific information and the requests that

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it is receiving.

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All right so let's jump back to service and back in the postman.

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And so it is pretty similar.

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You know the same header the same body but what's different is what the API is doing with it.

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So let me see if I got the.

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Make sure you got Mangu D and our local host up and running.

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They are.

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So if I send this we should actually be doing a logging request on our local host to see send.

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And sure enough here we go.

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We had a successful request.

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You can see here the status 200 which means that everything went ok and we receive a response from our

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API.

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AJ saw an object with a key user and a value of the user's e-mail.

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But the important one here is the token.

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OK so member in less than six we were talking about web requests and API and how some things are locked

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down and so you have to have an authorization token in the header.

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And this is the authorization token that we are going to need to be able to add to create to finish

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the creation of a user process to do sending a message to retrieve messages for the channels et cetera.

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So this is very important.

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OK.

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So let's go ahead and jump back in to execute and and code this out.

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So the ALM of our requests is actually pretty similar to the register user function.

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We are going to need to pass in an email which is of type string a password which is also of type string.

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And again we are going to be using our completion handler so that we know when and if the request was

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successful to completion at escaping and completion handler.

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And then like we saw in post-bin the header and body are actually the same so i can we can actually

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just copy this and we'll grab the lowercase e-mail as well.

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And but you see that we are now duplicating stuff right.

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So let's go ahead and make a constant for this header.

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So I'm just going to copy this header here.

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I'm going to cut it actually.

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And we're going to jump into Constans And then here I'm going to make a new section for headers.

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And I'm going to say let I'm going to make this capitalized to fit our constant convention and then

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I'm going to copy it and jump back into our servers and see who picks this up a little bit.

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I'm going to replace the header right here in the fridge or user Allum of our request with header and

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then right here we can delete this as well.

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Let's clean this up a little bit.

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But he's OK.

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And then we were ready to create our Alamo fire request.

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So just like we did with the register user We're going to see Alamo fire dot request.

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So now we are creating our web request and the URL that we want it to go to is the one that we just

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created which is you are l underscore loggin log in the method it is still a post the parameters the

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body encoding is just on encoding that default and the headers is header that constant that we just

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created.

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And in the register we did a dot response stream.

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Right.

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And I told you several times that normally we're going to be using with response Jaison.

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So that's the one that we want this time response Dusan because the response is specified in the API

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to be of type Jaison.

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OK so I'm going to select that one and press return again and rename the data response to response and

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just get rid of that code.

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OK.

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So at this point we have received a response from the API.

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So first off we want to do a check to make sure that we don't have any errors organise if response.

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Result dot error is equal to nil meaning there were no errors.

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Everything looks good.

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So we're going to do some stuff here but else we are just going to see completion is false.

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So that's our completion handler and we're letting any of the functions any of the locations that call

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this function know that the work request failed basically.

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And then we're going to do a Debug.

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Print to see what happens we're going to say response now result in error as any.

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And that'll just print out the error.

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But if we were successful we're going to see completion is true.

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So you know in the last function that we created the Registered User we didn't really need to do anything

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with the response did we.

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You know we just it was just to register user.

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The API didn't actually send any useful data back to us.

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But this time here in postman we see that we're getting some information back we're getting a sun object

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and now we need to know how to handle receiving a song from an API.

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OK so this is going to be called Chase on parsing.

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All right.

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So strap in.

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I'm going to show you a couple of different ways.

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The first is kind of the more lower level at the basics.

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At the base level of pre-Chase on parsing and it's important to know how to do it this way.

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But then I'm going to show you how to do it with Swiftie Jaison which I think is a much easier way of

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doing it.

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All right.

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So what we're going to do is inside of our response result is is based on value but we need to kind

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of turn that into something that we can use here and it's code.

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So what we're going to do is let Jason is equal to response to that result that value.

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And we're going to cast that as a dictionary.

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OK.

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Because it has a dictionary of type string.

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So I remember looking at our Jason objects in the past we know that the key is always a string but the

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value could be anything it could be you could be a ball it could be a string it could be an end it could

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be another just an object.

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So we're going to cast it as any.

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All right so now we have a G on variable.

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The syntax for working with G dictionary is similar to that of.

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I mean we've cast it as a dictionary.

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So really all we have to do to get to it is say if we let him go.

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So you know coming over here to postman we know that we have an object with a key of user and then the

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value is going to be a string of our e-mail.

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OK so I'm going to say.

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Email is equal to Jason and then we're going to drill into that sound object and we're going to look

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for the key called What was it called.

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It was the user.

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OK.

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So user.

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And we're going to cast that as a string.

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And if if we if we get that if there is in fact an object inside of the J sign dictionary called user

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then we're going to set the this variable right here.

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Self-taught user email equal to that values when I say self that user e-mail is equal to email I'm not

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too bad.

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So then we're going to also do the same thing with the token that we see here.

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So now we're looking for this carrot here token.

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So we're going to see if that token is equal to some of the dictionary that we just created from the

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juice on them.

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And we're going to search for the token key.

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And if we find it we're going to cast it as a string.

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And if we are successful if we get it then we're going to say self-taught off token is equal to that

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token right there.

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All right.

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And that's it.

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Then once that's successful we can say self-taught is locked in is equal to true because because now

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we have successfully logged in user.

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So that's it.

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That is our logging user function.

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In fact we can use this right away if we jump over to our create account.

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VC I remember the flow is register user logging user create user cerate here instead of just printing

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registered user.

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We're going to call our next API call in lines and say Office service and instance start and we're going

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to say logon user and we are going to pass in.

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Again the email the pass word which is just pass and then the completion handler again we're going to

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say success in order to get rid of this and we're going to see if success may just fall back up if success.

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Let's go ahead and print this print log in user.

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They didn't say a comma and we're going to then also print just to make sure that it worked.

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We're going to see our service for instance dot off tokin.

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All right.

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I'm going to save that and let's run it.

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Put this back on the success and run it.

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All right so we've got our app open.

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Click log in.

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Don't have an account set up here.

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And real quick let's jump back into safari and labs.

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And this was the one that we created last time that register.com and I want to use it again.

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So I'm actually just going to delete this object here OK.

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And so that just removes that account object from our database and you can do that with pretty much

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any of the collections and objects effectless.

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Let's just take a look real quick look at what we got here just to kind of go over what we've been doing

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right now is registering users.

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Those are going to be here and accounts.

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There are also collections here for channels and messages and users that are generated because of the

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work that I've been doing and the while I was creating this app.

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But you can actually delete whole collections and you can edit or delete objects inside of the collection.

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OK.

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So just a quick look at some of your options and lab.

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But anyway so back to exclude and our simulator.

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So I'm going to right here.

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I'm going to say register at test dot com.

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I'm going to put in a password one two three four five six and I'm going to see created that count and

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if all goes according to plan here in just a second we should see that it logs us in and then it should

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print out the last token as well.

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And I think it did just right here.

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Case closed this.

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And sure enough logged in user.

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And here is the offer.

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OK.

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So let's check in in labs

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and going to refresh this and once again there it is registred desktop.

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All right so now we have two out of three of our functions required to create a new user.

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We are registering a user.

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And now we are logging in that user so that we get the token so that we can then do the final step of

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adding the user.

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All right.

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So before we finish up here I told you I was going to show you what I think is an easier way of working

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with Jason.

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So let's jump back into our create account or not create account.

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Let's go to our of service that swift and I am just going to comment this out right here.

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OK.

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And first off we're going to import so if the U.S. does want to import Swiftie Jaison can and just go

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ahead and check out their get hub page if you just google for swiftie.

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Jason Oh it took me right to get her.

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But if you just google it and then click on it should be the top result forget hub and you can come

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over here and take a look at it kind of talks about how why the typical way of Giese on handling and

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swift is not so good.

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Show some examples.

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Kind of like what we were just showing you.

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You have to you know you have to cast it into a dictionary to see where to go.

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Yeah you have to cast it into a dictionary and you have to do a whole bunch of flats to unwrap.

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You have to cast it.

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And so what's with the Jason does it safely handles all of that for you.

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So for instance

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you can do something simple just like this instead of having to see if.

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It handles all of that for you under the hood.

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And so we're going to rewrite this section right here using Swiftie Jaison.

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So the first thing that we're going to do is we need to get the data out of the web response so we're

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going to guard that data.

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Equal response

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data Kelce return.

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OK.

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So we need the data because what Jason does is it creates an object out of the responsive data.

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So then I'm going to say you saw on equal and I'm going to say capital Jason and to initialiser and

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what we want right here is to just pass in data and the data that we're passing in is data.

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OK.

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So now we have a chase on object Swiftie J song object and so simply the next couple of steps is just

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setting self-taught user email equal to a song.

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We're going to drill down into it and get the user.

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And what I really like about Swifty Jason is that you can say string value.

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OK.

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And this automatically safely unwraps this value for you.

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So you could do the if let's just do that string.

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But what this does for you is it'll say it automatically unwraps it for you or it'll just set it to

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a empty string.

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All right.

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So that's super helpful because you know there are times when you need to know if something is nil and

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to do something about it.

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But most of the time if it doesn't exist then you probably just want it to be an empty string or zero.

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If it's for numbers and so I think that this is super helpful.

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So we're just going to do then a self-taught off tokin easy to juice on and that is tokin top string

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value and that's it

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so these four lines versus these one two three four five six seven eight nine I guess that's technically

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eight eight lines.

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You don't have to do the lead.

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You don't have to cast into dictionaries you don't have to cast as strings.

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I think it's a super sleek way of handling working with Jason.

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And this is this is this right here is about as easy as it comes working with Jason the the old way.

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If you if you have nested chase objects or a raise it gets a lot hairier.

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And the benefits of working with the Jaison become even more apparent.

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All right.

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So so you know it is important to know how to do it this way just because you might not be in an environment

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where they want to use with the chase on they me you know really want you to do it the old fashioned

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way which is fine.

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So just wanted to show you both ways so that you have options.

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But I am going to continue using Swiftie Jaison for the rest of this course so I'm going to delete that

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other stuff and just to make sure that we are still working correctly I'm going to run this again and

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test this one more time.

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So when I log in an account sign up here to create a new one so register to at test dot com and one

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two three four five six and create an account

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and there we go logged in user and there are auto.

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All right so our Jason refactor worked perfectly and we are good to go on to our third and final stage

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of creating a user.

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So yet in this lesson we learned about working with Jay song and we talked about it using it the old

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way as well as a different way with Swiftie J song.

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So I hope you guys liked both ways.

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Luke Mitry to know the first way that I showed you because it's very important that you understand what

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kind of what's going on under the hood.

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But yeah so this has been some good stuff that you guys are enjoying it so far.

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I'm going to go ahead and commit our stuff that we've been working on so far as to say get status to

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get and get commit it.

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This is less than 11.

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All right.

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So you guys are excited to finish up the account creation process and the next lesson and I will see

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you there.