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Everybody this is Caleb with slopes dot com.



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And in this video we're going to create our group model there.



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We're going to use that to download all of our groups from firebase and pass it to groups Visi where



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we're then going to unload it and pass it into the table view so we can see every group that we're in



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created and have been invited to.



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So let's pull open our X code project and we are going to start by going to our model group and we're



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going to right click and create a new file.



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Now of course this will be a swift file and it's going to be called group.



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Now we need to think about what kinds of things go in a group what do we need.



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Well when we add one we add title a description and we give it an array of members.



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Now something else a group should have is a unique key right which it does in firebase but we should



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add that to our model layer.



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And we should also keep track of how many members there are in our group.



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So very cool.



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Let's go ahead and let's create this class so-call class group and now we're going to create five private



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variables to hold all of those properties that we need.



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So private var underscore and we're going to go with group title of type string.



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So a group needs a title private var group description of type string.



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A group also needs a key or a unique ID of type string.



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Once a group is going to need a member count of type in pay attention to that we're also going to need



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private var members and that's going to be an array of type string.



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OK and that's going to contain all of the names of our members.



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And we're going to use that when we actually open each group and it'll pass in the member names and



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we'll show them on the View Controller for each group.



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So we now have five variables and now we're going to go ahead and set up some public variables that



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we're going to return the values of these two.



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So go ahead and create one for group title var group title of type string.



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And we're just going to return group title next group description of type String.



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We're going to return group description.



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OK keep doing this for key and the rest.



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What's key is going to return key



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and then we have member count member count of type int.



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We're going to return int member count member count then we'll have you know what.



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It's hard to see let's go ahead and put this up a little higher.



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Var members is going to be an array of string.



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And we're going to return members members.



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There we go.



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So now like any model there we need to initialize everything for when we create it.



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So let's go ahead and call in it and we're going to pass in parameters.



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So we're going to give a parameter for the title of type string.



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The description description of type string.



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The key of type string the members which is an array.



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Sorry.



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Members an array of type string.



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And then the member count of type int.



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Now to initialize we just call a self underscore group title.



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And we're going to set that to title of course self dot group description.



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It's going to be description self-taught key underscore key sorry.



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It's going to be equal to the key we pass in from our function self-taught members underscore members.



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Sorry is going to be equal to the members we pass in from our function and self-taught member count



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with an underscore is going to be equal to member member count.



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There we go.



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So when we initialize this we're going to initialize all the values and that's exactly what we need



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to do to create a group.



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We'll use this model to pass a group into the view controller when we select one.



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So for instance in our simulator here let me pull it up and open our app when we go into groups and



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if we select a group it's going to need to pass in this Daim the members the member count the key.



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All that information so it can display all the relevant messages and users on the next screen.



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That's why we're creating a model there.



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So now that we have a model where we can go ahead and write our function in our data service that's



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going to pull all the groups down from firebase and create an array of group thanks to our model there.



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So let's do that go ahead and type phunk get all groups.



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OK.



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And this function of course is going to need to return or I guess escape values from the closure.



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So we're going to use a handler like we have throughout a lot of this course.



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It's going to need to be a scaping so we can get the values out and we're going to go ahead and return



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nothing.



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But we are going to pass a value to our handler and we're just going to call this group's array which



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is going to be an array of group that's our class that we just made.



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Now we're going to go ahead and just like above we're going to create an array.



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We're going to create a for loop to cycle through all the groups and we're going to create a handler



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that's or we're going to use our handler to pass that array back once it's full.



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So go ahead and just call var group Saray and it's going to be an array of type group as you might have



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expected.



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Now we're going to go ahead and look at our group's reference so call ref groups and we're going to



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observe a single event kind of type value.



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So we're just going to pull all the values down.



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And of course we're going to have a data snapshot which we can call group snapshot.



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So what we're going to do is we're going to create a constant that's going to hold the value of all



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the objects of this snapshot.



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Then we're going to for loop through them.



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So just like before we'll type God let groups snapshot equals group snapshot children.



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Whoops sorry no s there.



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Group snapshots.



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Children.



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All objects.



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And of course we're going to cast it as an array of data snapshot.



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Else there's nothing we're just going to return.



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Very cool.



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So now that we have our group snapshot Let's go ahead and cycle through all the groups by typing for



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group in group snapshot.



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And as we do that this little arrow will go away saying that we've never used it because we did for



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group in-groups snapshot.



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We're going to basically need to pull down the array of members.



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Now we need to look at firebase to see what I'm talking about here.



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But when I created a group earlier we passed it an array of members.



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Now let's go in and look at it.



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So right here members now this is an array.



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So we need to pull it down as an array and then we basically need to pull the information from it.



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OK.



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So let's go ahead and let's set up that member array by typing let member array meaning for each member



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of the group.



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And we're going to pull out the child here or I guess the object from the child and we're going to get



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the child snapshot just like we've done for the username.



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Right.



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When we pull out the e-mail we go into each user and we pull out the snapshot of their email key and



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we get the value then we cast it as a string.



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But for the group we're going to pull down the member array.



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So we're going to take a group snapshot for the key or for the path members.



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All right we're going to cast that as an array of string.



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Yes.



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So now we have an array of members and that's awesome.



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We're getting a morning here cast from data snapshot to unrelated type string always fails.



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Oh right sorry.



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So a child snapshot.



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This is just the name of the key but we want the value.



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We want the good stuff inside.



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So we need to pull out the value and cast that as an array of string.



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So now we have a local array of strings that are the IDs for every member of our group which is really



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cool.



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So here's what we're going to do.



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We're going to get all the groups that we are a part of.



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OK.



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It doesn't matter if we download all the groups for the entire app because we might not be in every



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group.



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So what we're going to do is we're going to check to see if the member array includes us.



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So let's do that.



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If member array contains.



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And we're going to pass in.



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You ID.



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So go ahead and type Auth. off.



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Current User dot you ID and it's going to yell at us that we need to unwrap it.



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I'll fix that in a second.



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But basically what we're doing is we're just saying if this group contains me we're going to move forward.



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Because that's the one that really matters is the groups that we're in it doesn't matter if we're in



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someone or we show somebody else's group.



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So go ahead and click fix to force and wrap the ID from firebase.



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And now we're going to go ahead and build our group.



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So let's type let a group equals group and we need to pass it some parameters.



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Where can we get those firebase we have a title a description.



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We have a unique key.



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We have a list of members and we have a member count.



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So let's go ahead and let's create some variables for those let title equals group right because we



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just pulled down this group group got child snapshot for path and for the title The path is called Title.



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We need to pull out the value and force cast that as a string.



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There we go.



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Now we have a title so give it the title.



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Next we need to do descriptions so let description equals group.



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Child snapshot for path.



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Look at firebase.



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It's called description so description value as string now we have a description pulled down from firebase



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So this we're going to pass it.



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Description the key.



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The cool thing is all we have to do is type group key and we get the key members.



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All we need to do is pass it the members array which we have here.



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Pretty neat.



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And we're going to go ahead and give the member count which we can get from member array count.



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Super duper easy.



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Now we have everything that we need.



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We have a group we can append it to our group array like so group groups array append.



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And it asks for a new element of type group so let's give it one.



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Very cool.



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So we can get the title the description we have the members which we already pulled down.



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We have the members array and we can just access the count to pass in the member count.



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So outside of the for loop we're going to use our handler to pass back this array.



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So go ahead and type handler and we need an array of group.



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We have a groups array.



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That's it.



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This is all we need to do to download all the groups from our app.



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Very cool.



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We're using observed single event because when it loads that'll just load all the groups around but



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this will not give us that cool real time updating that we want.



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So we're going to have to do a little bit of a tweak in our group Visi to make it work the way that



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we're hoping.



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So go ahead and go into groups AVC and we're not going to reload the table view here.



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I'll tell you that much.



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But what we're going to do instead is we're going to go ahead and set up view did appear to download



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all of those groups add them to a local groups array here and then reload the table view.



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It's very similar to what we did in Pheed VC.



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We downloaded all the messages.



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We set our local message array and then we reloaded our table view.



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So in-groups VC we're going to actually do the same thing.



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We're going to go ahead and type var groups array and it's going to be an array of group and we're going



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to instantiate it like so.



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Next we're going to get rid of this view or get rid of the reload data in view to load and we're going



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to call you did appear you did appear then call superdog viewed it appear and pass in animated.



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Then we're going to do is we're going to call our get all groups functions so type data service instance



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get all groups that will download all the groups that involve us.



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And then when we return our array of group we'll just call this returned group array groups because



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there's more than one group we can go ahead and say self doc groups Saray equals returned groups array.



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And this is a great place to reload our table view.



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So go ahead and type self groups table view that reload data.



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And now our table is going to go ahead and reload every time that we do this.



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But remember get all groups is an observed single event function.



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It's only going to get called once and executed once if data changes on firebase.



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It's not going to get called again because we're only observing at one time not persistently.



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So what we're going to do is we're going to set up an observer in did appear to monitor when ever the



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group's array is changed.



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So let's go ahead and call ref groups.



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Oh you know what sorry we have to access our data service first because it's private.



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So data service instance ref groups.



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And outside of ref groups we're going to go ahead and observe everything.



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OK.



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Not a single event but everything we're going to observe if it's removed if it's added so that our table



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view can be updated in real time.



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Go ahead and type value because we're going to be observing for all values added subtracted changed



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and we're going to go ahead and return a snapshot.



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But we're not going to do anything with it.



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What we're going to do is instead pass this in to this closure so that when we are observing all values



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when we add a group delete a group change a group it's going to call this return our updated groups



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array and reload the table view.



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Let's go ahead and let's BuildOn run this and see what happens.



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Let's see if it works.



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And it's going to give me an error and yell at me.



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So rude.



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We go are simulator's popping up.



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There we go.



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Very good.



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And as soon as this loads we will try it out to see if our table view is properly working.



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All right here we go select groups and oh my we get to crash what's the problem.



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So could not cast value of N.S.A..



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And as array could not cast a value of type and SNL to MSRA and looks like that air is coming from where



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we tried to cast member array as a value of string.



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I see the problem.



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OK.



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Take a look in firebase.



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It's called members.



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I typed member.



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That's the danger of dealing with strings.



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Let's build and run and try it again that appeared to be the only issue we couldn't pull down an array



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because we did not have the right name.



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Embarrassing anyway.



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OK let's try it.



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Click groups get a table view.



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That looks great but it's not downloading information that's problematic.



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Let's go back and let's see what the deal is.



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Oh guys you know what we did not set up our table view yet to actually pull data from firebase we have



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only set it up to show three static cells.



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Let's change that.



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So instead of returning three rows in section we're going to return the count of groups array.



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So let's do that.



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Array does count.



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That's not what I want.



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Groups array count that will return the amount of groups that we've returned from firebase.



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Now for configuring the cell we're going to actually go ahead and pull our group from our groups array



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for this specific index path.



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So we can just call Let group equal groups array and we can pull out the element at the index path for



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the particular row.



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So if we want the cell at the first row we'll pull out the first index path from our group's array and



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that will be our group because remember groups array is of type group.



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Now that we have that group we can just go ahead and call group dot title for the title we can add group



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description and we can add group member count.



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Now if we had 100 groups it would load 100 cells and it would pass in a unique group to each cell and



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load the data.



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Let's really run this and see how we did we might even add a new group just to see how instantaneously



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it adds a new one.



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It'll be super cool.



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Click groups.



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There is not heard.



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There are four members.



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Looks like it downloaded properly from firebase.



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Let's create a new one.



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Let's see how we do.



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How about devs slopes.



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Learn to code with us.



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Very cool.



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All right.



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Let's add some folks let's add Chuck let's add Harvey Dent let's add Mark and Evan and her money.



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OK.



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There we go.



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Click done and look at that.



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Learn to code with us.



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It was instant.



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Did you see how instant that was.



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It's downloading from firebase.



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It's showing the amount of members our groups are working guys.



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This is amazing.



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So we can now download groups from firebase we can import them into our table view and show them in



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real time in the next video we're going to build group BVC where you're basically going to set up a



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similar window to the feed we see here which is public but it's going to be per group it's going to



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only allow members of the group to message each other and it's going to show all the messages for that



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is going to be super cool.



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Let's go ahead let's head over that way and let's build it out.