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Everybody this is Caleb with Debb slopestyle and in this video what we're going to do is carry on where

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we left off last time which was creating 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 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 there 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 email.

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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 user names

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and it's going to allow us to pass in an array of usernames and get all of the associated IDs that go

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with them.

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So go ahead and type phunk get IDs wups only one t IDs for user names.

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And go ahead and use an internal parameter there of usernames colon and then the user names of course

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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 in a scaping 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 id

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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 usernames 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 of all objects.

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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 very.

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So that's great.

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Now assuming we get to 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 appending 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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No not sorry 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.

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And we're 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 names array contains the e-mail from the user.

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OK if it contains it what we're going to do is we're going to go ahead and append it to the idea array

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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 account key.

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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 ideal right.

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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 of course an internal parameter of title we're going to create

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a group with a description and description 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 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 and it's going to be escaping just like we've been doing.

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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 and that's what passed pass back to tell wherever we

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call this that were done creating a group.

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And we'll 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 group's 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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Whoops ref groups and we're going to go ahead and just every time we create a group it's going to be

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created 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 air handling.

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But really the only areas that we're going to run into are errors of Internet connectivity so I'm just

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going to assume that you have 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 extents and purposes of this video but for now let's go back to create groups

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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 IB 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 that title we needed description and we need some members right can't just add

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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 user's array because the button is hidden and shown based on

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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 group is a group.

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Maybe it's just title 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 lips instance.

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In that instance get ID's for user names.

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And where are we going to get those usernames chose 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 slopes Harvey

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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 dot a pen and I'm going to add myself.

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So off oops sorry off.

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Auth.

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do I don't have oh great groups VC does not have firebase.

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How funny is that.

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All right ad firebase and now go back to user IDs that a append Auth. dot off current user.

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And we're going to pass in the ID not the e-mail.

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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 or 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.

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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.

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True.

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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 Iler 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 since we're in a closure we need to hold a reference to self or just tell it that it's coming

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from this view controller.

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So add self dot title textfield a text et cetera 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.

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Marty.

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Great Scott.

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Harvey Dent.

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Chuck at 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 Let's pull up firebase which I believe is hiding

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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.

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Remember users Let's find Batman at Gotham 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 m 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 we're

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

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