add function AddOrDeleteFriend

Sources/justMUSIC/lib/components/profile_list_component.dart

@@ -74,6 +74,7 @@ class _ProfileListComponentState extends State<ProfileListComponent> {
                   child: InkWell(
                       splashColor: Colors.white.withOpacity(0.3),
                       onTap: () {
+                        MyApp.userViewModel.addOrDeleteFriend(widget.user.id);
                         setState(() {
                           clicked = !clicked;
                         });
@@ -93,6 +94,7 @@ class _ProfileListComponentState extends State<ProfileListComponent> {
                   child: InkWell(
                       splashColor: Colors.white.withOpacity(0.3),
                       onTap: () {
+                        MyApp.userViewModel.addOrDeleteFriend(widget.user.id);
                         setState(() {
                           clicked = !clicked;
                         });

Sources/justMUSIC/lib/model/mapper/PostMapper.dart

@@ -2,7 +2,6 @@ import 'package:cloud_firestore/cloud_firestore.dart';
 import 'package:tuple/tuple.dart';
 
 import '../../main.dart';
-import '../Music.dart';
 import '../Post.dart';
 import '../User.dart';
 

Sources/justMUSIC/lib/services/UserService.dart

@@ -14,8 +14,25 @@ class UserService {
       String id = doc["unique_id"];
       return id != MyApp.userViewModel.userCurrent.uniquePseudo;
     }).toList();
-    print("cc34" + users.toString());
 
     return users;
   }
+
+  addOrDeleteFriend(String id) async {
+
+    var userRef = MyApp.db.collection("users").doc(MyApp.userViewModel.userCurrent.id);
+
+    if (MyApp.userViewModel.isFriend(id)) {
+      await MyApp.db.runTransaction((transaction) async {
+        transaction.update(userRef, {'followed': FieldValue.arrayRemove([id])});
+      });
+      MyApp.userViewModel.userCurrent.followed.remove(id);
+    } else {
+      await MyApp.db.runTransaction((transaction) async {
+        transaction.update(userRef, {'followed': FieldValue.arrayUnion([id])});
+      });
+      MyApp.userViewModel.userCurrent.followed.add(id);
+    }
+  }
+
 }

Sources/justMUSIC/lib/view_model/UserViewModel.dart

@@ -78,6 +78,15 @@ class UserViewModel {
     }
   }
 
+  AddOrDeleteFriend(String id) async {
+    try {
+      await _userService.addOrDeleteFriend(id);
+    } catch(e) {
+      print(e);
+      rethrow;
+    }
+  }
+
   logout() {
     _authService.signOut();
   }