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Everybody this is Caleb with deps slopestyle.



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And in this video what we're going to do is carry on where we left off last time which was creating



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our group.



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We can add users now into a chosen user array.



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The Done button appears we're going to set up what happens when you tap on that done button today.



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So go ahead and open that XCode project.



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And we need to think about where our app currently stands.



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Let's pull it up and let's take a look.



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If we go in and I search for some users I add in maybe three friends.



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And if I want to click done if I want to create this group I'm going to upload it to firebase but as



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it currently stands we only have the emails of the users.



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And if we're going to be getting their messages later we're going to need to basically pull down their



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user ID because if you remember in firebase Let's pull that up.



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Every message has content and a Sender ID.



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Now every account has an ID and an e-mail.



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But right now as it currently stands we have sort of separated our data into only having an email.



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So we need to write a function in our data service that's going to allow us to convert an email into



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the appropriate ID from firebase.



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So let's go into our data service and we're going to write a function called get IDs for usernames and



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it's going to allow us to pass an array of user names and get all of the associated IDs that go with



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them.



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So go ahead and type phunk get IDs.



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Only one t IDs for usernames and go ahead and use an internal parameter there of usernames colon and



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then the user names of course all come in as strings.



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So that's fine we can leave it at that but we're going to need to return an array of strings as well.



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So we're going to use a handler for that because we're using firebase.



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So make it an escaping handler and of course we're going to use a function that returns an empty function



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and the value that we're going to pass into the handler is going to be called Let's just call it you



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ID array.



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And like I said it's an array of type string.



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So what we're going to do now is observe our users reference we're going to observe a single value meaning



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it's just going to cycle through one time it's going to return all the IDs for the user names that we



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pass in.



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So here we go.



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Let's go ahead and let's call refusers.



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We're going to observe a single event



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and of course the data type is value and we're going to create a snapshot.



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Now this is going to be user snapshot and we're basically doing this very similarly to how we've been



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doing it in the past with guard let users snapshot equals user snapshot.



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Children are not all objects and we're going to cast it operationally as an array of data snapshot.



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Very cool.



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Otherwise we're just going to return.



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Very cool.



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So that's great.



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Now assuming we get a value assuming we have users which if the button is showing that means we have



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added users so we definitely will get users back.



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Not to mention that we're pulling this from firebase anyway Sorry.



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So it's going to pull all the users from firebase.



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But you know how we've been creating an array to hold everything doing a for loop pending things to



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the for loop and then passing that array back to the handler.



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We're going to do the same thing here.



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We're going to create an array called Idea array.



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So type of var ID array and it's just going to be an empty array.



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I know Nazzaro an empty array an array of type string.



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My mistake.



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So now what we're going to do is we're going to cycle through every user in the user snapshot and we're



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going to compare it against the user names array.



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So go ahead and type for user in user snapshot.



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So now we're cycling through the user snapshot we're pulling out every user.



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And what we're going to do now is we're going to check to see if the user names array contains a certain



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user's e-mail.



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So go ahead and type if usernames dock contains.



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And now we need to get the e-mail value for this user.



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If you remember we did that this way right here user child snapshot for path value as string.



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Now we're going to go ahead and we're going to copy this and we're going to paste it down here and we're



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going to check if the user name user usernames array contains the e-mail from the user.



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If it contains it what we're going to do is we're going to go ahead and append it to the idea.



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But we're not going to append the e-mail.



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We're going to append the key for this user because that's their unique ID.



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So go ahead and type ID array append user Akaki.



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OK.



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So that is how we're going to fill up our ID array.



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Then at the end of the for loop we're going to go ahead and call our handler and we're going to give



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it an array of strings which is ID array.



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Pretty cool.



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That's all we need to do to get all the IDs for a certain user.



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And that's what we're going to do to download all the ideas that we need.



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And then after we get all of the ideas we're going to pass them up to firebase to create our group.



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So now we need to write the function to create a group.



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Now we need to think about a group if we go into our simulator here a group has three things a title



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a description and it's also going to have a list of users that are in it.



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OK.



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So we're going to create a function to create a group go ahead and type phunk create group and we're



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going to create a group with a title.



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Of course an internal parameter of title we're going to create a group with a description and description



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so description I don't think that's spelled right.



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No description.



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There we go.



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So with title and description and we also need to create a group for a set of user IDs and we'll just



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say IDs that's going to be an array of string.



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OK.



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Now that's great and all but we're going to also need a handler to basically let us know when the send



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is complete.



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We're also going to need a handler to determine when the group is officially created.



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So go ahead and create a handler.



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And it's going to be escaping just like we've been doing.



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Should be an expert at this by.



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By the end.



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Go ahead and we're just going to use a boolean to check.



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We'll just say a group created of type Boolean.



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And that's what we'll pass back to tell wherever we call this that we're done creating a group and we'll



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just use that to dismiss the view controller.



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But OK this looks great.



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We're ready to create a group now.



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We're going to use our groups reference.



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We have not used that yet but it's up here and it takes us to the firebase database child called Groups



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or at least it will create it if it's not there.



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So go ahead and call ref groups.



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Ref groups and we're going to go ahead and just every time we create a group it's going to be created



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with a random ID because it doesn't really matter.



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The idea of the group because the group can be random it's not associated to one particular person.



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So go ahead and type child by Auto-ID and then inside that child what we're going to do is update the



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child values.



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Now it asks for a dictionary and we're going to give it one.



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So for this group it's going to need a title and the title value will come from the title that we pass



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in.



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It's going to need a description and we're going to get that from the description we pass in.



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It's also going to need a member's list.



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And so what we're going to do is we're going to pass it.



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Members.



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OK.



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And it's going to get that from IDS.



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That's the array of strings that we pass in.



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And that's what we're going to pass in.



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It's not easy it's really easy actually.



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So that's great.



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And then once that is done we're going to go ahead and just call our handler and we're going to pass



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it through OK because our group was then successfully created.



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Now I could be using a completion handler here and doing some error handling but really the only errors



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that we're going to run into are errors of Internet connectivity so I'm just going to assume you have



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good enough Internet that it's not going to be a problem.



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If you want to you can go ahead and add the completion handler and you can say if it's successful handler



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returns true.



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Otherwise return false and then print the error.



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That's up to you.



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I'm not going to for the extent and purposes of this video.



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But for now let's go back to create groups Fisi and let's set up our done button to create a group.



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OK let's go back up and we have an I.B. action here for that done button.



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Now we need to think of a few things we need to have some conditions met before we can press done.



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And before we can send our group up to firebase and basically let's let's take a look.



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So obviously we knew the title we needed description and we need some members right.



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Can't just add it without any members.



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But if you remember properly the done button uncheck everybody it's hidden.



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If there's no one added so we can't really do that unless it's added anyway so let's just leave it.



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We don't need to worry about this or the users because the button is hidden and shown based on that.



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But we do need to monitor the text to make sure that there is a title and a description.



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So go ahead and we're going to just check if a group is a group.



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Maybe it's just title your title textfield text is not equal to an empty string and description textfield



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text is not equal to an empty string.



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Now we need to do is we need to download all those user ID is because remember we only have emails we



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don't have user IDs so let's go ahead and let's do that by calling data service instance this instance



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not in that instance don't get ID's for user names.



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And where are we going to get those usernames chosen user array.



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Right.



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Because we've already added them all right here we have an array of chosen users.



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Now the handler returns an array of string.



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And if we think about that that's just an array of all the IDs that we got.



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So let's just say IDs array.



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And of course that gets returned here.



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Now we need to think about this though at this moment we have Marty a great Scott market Deb slopes



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Harvey Dent but if you remember the account I'm logged into is Batman at Gotham dot net.



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So by default that's not going to show up.



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I won't even be in my own group.



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So what I need to do is actually add myself to this array and to do that I'm just going to create a



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temporary variable that's just going to hold the ideas array and I'll call it var user IDs equals IDs



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array.



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I'm going to go ahead and call user IDs a pen and I'm going to add myself so off.



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Oops sorry off.



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Auth.



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do I not have oh great groups.



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VC does not have firebase.



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How funny is that.



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All right ad firebase.



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And now go back to user IDs that append auth dot off current user and we're going to pass in the ID



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not the email.



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OK and if I build this you'll see it gets an error.



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We have to force unwrap it just like so.



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And now user IDs has all four of my for are three of my friends and myself.



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So that's awesome.



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But now I need to create the group on firebase because I just press the done button.



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We just created that function so called data service instance WIPs instance create group with Title.



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We're going to take title textfield text and description is from description textfield text for user



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IDs.



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We'll pass it in user IDs that's the one we just pulled down from firebase and added ourselves to.



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And now the handler is going to be for.



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Let's just say group created capitalized this group created.



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All righty.



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So very cool.



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If the group is created We're going to go ahead and call self dismiss true and then Knill.



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OK so we're just dismissing the view controller.



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If the group has been created successfully else we're going to go ahead and just print group could not



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be created.



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Please try again.



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And of course you could always set this so that it shows a UI alert controller that's up to you.



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But let's go ahead and let's try this let's try to add our group and let's see how we do build and run.



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We're getting some errors here.



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Oh of course.



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Sorry.



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Since we're in a closure we need to hold a reference to self or just tell it that it's coming from this



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view controller.



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So add self-deceit title textfield text et cetera.



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And it looks like our build succeeded.



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This is great.



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Go into groups.



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Tap the plus button.



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Let's try to let's add some friends here Marty.



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Great Scott Harvey at dot com.



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Chuck by more and let's go ahead and let's give our group well let's try it.



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Can't do anything unless it has a title.



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Let's call this the nerd herd.



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The nerdiest nerds around.



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Nice.



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So now if I select done since I have added a title a description and I have selected people it should



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allow me to click done.



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All right.



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So it worked it dismissed.



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That means that our group was created successfully.



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Let's pull it firebase which I believe is hiding back here.



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And let's go look.



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OK.



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Amazing.



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We now have a groups reference and if we look inside has a random ID.



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Let's open it up.



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We have a description.



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The nerdiest nerds around the title Nerd Herd and the members take a look at this.



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This is amazing.



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We have four users three that I added and one that is myself's remember users find Batman at Gotham



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that is.



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There is.



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OK.



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So this ID C to D There I am c to d.



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The last one in the Iraq because I added myself last.



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Very very cool.



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So guys we can now successfully create groups in firebase we can upload them in the next video what



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we're going to do is we're going to set up our group cell so that in here whenever a group is added



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if we're added to to a group it'll show up in real time immediately.



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It's amazing.



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So in the next video we're going to write that function get our group showing up.



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And guys this is this is so cool our app is coming together.



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It's starting to look really nice.



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Nicely done.



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Let's go ahead and move on to the next video where we will set up that table view and pull down all



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of our group's.