Any idea how to create a groups like whatsapp ??

[nasser-al-bluwi]

Hi guys ,
i’m creating an app users can sign in and create a group with multiple users in it that they can sharing a pictures or anything (the creator of the group is the admin or he can pass the administration to any one in the group) ? any idea how to do that ???

[mark-piller]

Hi Nasser,

How to do what?

Create app? Create group with multiple users? Sharing pictures or anything? Pass administration to any one?

There are a lot of questions.. Please keep in mind that the support we can provide is specifically on Backendless API and features we support.

Regards,
Mark

[nasser-al-bluwi]

Hi Mark,

ok, How to Create group with multiple users?

[mark-piller]

here’s one way to do it:

http://support.backendless.com/public/attachments/8bfeed15907d15ceaae776e2999d5595.png</img>

[nasser-al-bluwi]

thanks Mark very much for supporting

ok how to add a specific user to a specific group by Code Not the panal ?

Because in my app i’m trying to give any user the functionality to create a group and add some users in it for sharing photos or anything !

[mark-piller]

See the documentation: https://backendless.com/documentation/data/ios/data_relations_save_update.htm

[nasser-al-bluwi]

so for each group i have to create a table ?

[mark-piller]

No, the UserGroup is already a table, for each group you will save an object in that table

[nasser-al-bluwi]

Thanks Mark

i did it thanks to youhttp://support.backendless.com/public/attachments/2b450add0ba9f4debdfc619da59fe34e.png</img>

[mark-piller]

You got it, Nasser! Great job!

[nasser-al-bluwi]

Hi Mark,

I’ve managed adding users very well with this Code

let User = userResults[indexPath.row]
        
        let member1 = backendless.userService.findById(User.memberId)


        let query = BackendlessDataQuery()
        let group = backendless.persistenceService.of(Groups.ofClass()).find(query)
        let currentPage = group.getCurrentPage()
        
        
        for theGroup in currentPage as! [Groups] {
            
            if theGroup.objectId == addNewUserGroup?.grouPId {
                
                if theGroup.ownerId != member1.objectId {
                    
                    theGroup.members.append(member1)
                    
                    var error: Fault?
                    let result = backendless.data.update(theGroup, error: &error) as? Groups
                    if error == nil {
                        print("Member havs been added: \(result)")
                    } else {
                        print("Server reported an error: \(error)")
                    }
                    
                } else {
                    
                    displayAlert("You are the owner of this group !", message: "")
                    print("He Is The Owner!")
                }
            }
        }

BUT i’m struggling with delete users from the group … I’m trying with this code

let User = memberResult[indexPath.row]
            let member = backendless.userService.findById(User.memberId)
            let TheGroup = backendless.persistenceService.of(Groups.ofClass()).findID(groupUsersInfo?.grouPId) as! Groups


            let index = TheGroup.members.indexOf(member)
            TheGroup.members.removeAtIndex(index!)
            
            var error: Fault?
            let result = backendless.data.update(TheGroup, error: &error) as? Groups
            if error == nil {
                print("Member havs been updated: \(result)")
            }
            else {
                
                print("Server reported an error: \(error)")
            }

it give me this error …
http://support.backendless.com/public/attachments/83fa00ef5af555bf434163dac82badbe.png</img>

what is the problem ?

[mark-piller]

I do not know, it looks like a problem in your code and not with Backendless API. Use debugger to see where it does not work as expected.

Mark

[nasser-al-bluwi]

so my delete users code is correct ?

[mark-piller]

it is, however, you need to make sure that the “members” collection is also returned. See the “Single Step Retrieval” section here:
https://backendless.com/documentation/data/ios/data_relations_retrieve.htm

Regards,
Mark