CODEWITHSUNDEEP
iosobjective-cparse-platform
Roman
Roman

Reputation: 366

Parse.com array of pointers or PFRelation

Help me please. I am working with social network app. I want create PFObject "Group". Users can follow it. But only other participants can add other users as members.

As I understand I can develop following feature with PFRelation class. But tell me please, how can I develop feature with adding other users to group?User is protected class so I can't add PFRelation to another user. So only one way adding users to groups by another user is creation array of pointers?

Any thoughts? Thanks

Upvotes: 0

Views: 421

Answers (1)

applequist
applequist

Reputation: 314

So you want to create a many-to-many relationship between users and groups and only users that are already members of a given group can add a new user to this group right ?

If so here is how I would do it...

  1. Group creation

    // Create the group and add its creator as the sole group member
PFUser * user = [PFUser currentUser];
PFObject * group = [[PFObject alloc] initWithClassName:@"Group"];
PFRelation * members = [group relationForKey:@"members"];
[members addObject:user];

// Set an ACL so that the group is visible but only the 
PFACL * acl = [PFACL ACL];
[acl setPublicReadAccess:true];
[acl setWriteAccess:true forUser: user];
group.ACL = cal

  2. Add a new group member

    PFUser * member = [PFUser currentUser];
PFUser * candidate = ...; // not yet a member 
PFObject * group = ...; // The group candidate wants to join
PFRelation * members = [group relationForKey:@"members"];
[members addObject:candidate];
[group.ACL setWriteAccess:true forUser:candidate];

In step 2, member is a member of group and so has write access required to add a new user, candidate. After step 2, candidate is now a full member and has gained write access to the group.

However I have not tested this: - Does the relation "inherits" the ACL from the group ? Or anyone that can read the group, can access the relation and then add itself to the group ?

Also it seems hard to distinguish roles among members. I think that now any member could decide to delete the group...

You're probably better off enforcing the rules at application level.

Upvotes: 1

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