started on user role assignments

src/RoleEditor/MainWindow.xaml.cs

@@ -34,8 +34,8 @@ namespace RoleEditor
         private readonly ObservableCollection<Role> _roles = new ObservableCollection<Role>();
         private readonly ObservableCollection<Securable> _securables = new ObservableCollection<Securable>();
         private readonly ObservableCollection<User> _users = new ObservableCollection<User>();
-        private readonly ObservableCollection<Role> _assignedRoles = new ObservableCollection<Role>();
-        private readonly ObservableCollection<Securable> _assignedSecurables = new ObservableCollection<Securable>();
+        private readonly ObservableCollection<RoleAssignment> _assignedRoles = new ObservableCollection<RoleAssignment>();
+        private readonly ObservableCollection<SecurableAssignment> _assignedSecurables = new ObservableCollection<SecurableAssignment>();
         private DBManager _dbManager;
 
         #endregion
@@ -202,7 +202,7 @@ namespace RoleEditor
             this.textBoxRoleDescription.Text = (r != null) ? r.Description : string.Empty;
         }
 
-        private void listBoxUser_SelectionChanged(object sender, SelectionChangedEventArgs e)
+        private async void listBoxUser_SelectionChanged(object sender, SelectionChangedEventArgs e)
         {
             User? u = this.listBoxUser.SelectedItem as User;
             this.textBoxUserFirstName.Text = (u != null) ? u.Firstname : string.Empty;
@@ -212,6 +212,18 @@ namespace RoleEditor
             this.textBoxUserCreated.Text = (u != null) ? u.Created.ToString() : string.Empty;
             this.textBoxUserModified.Text = (u != null) ? u.Modified.ToString() : string.Empty;
             this.textBoxUserPassword.Text = string.Empty;
+
+            // load roles assigned to user
+            _assignedRoles.Clear();
+            foreach (RoleAssignment ra in await RoleAssignment.LoadForUser(u, _dbManager))
+            {
+                foreach(Role r in this._roles)
+                {
+                    if (ra.RoleId == r.Id)
+                        ra.AssignedRole = r;
+                    _assignedRoles.Add(ra);
+                }
+            }
         }
 
         private void listBoxSecurables_SelectionChanged(object sender, SelectionChangedEventArgs e)

src/brecal.model/RoleAssignment.cs

@@ -12,12 +12,60 @@ namespace brecal.model
 
         #region Properties
 
+        public int? UserId { get; set; }
+
+        public int? RoleId { get; set; }
+
         public Role? AssignedRole { get; set; }
 
         public User? AssignedUser { get; set; }
 
         #endregion
 
+        #region public static methods
+
+        public static async Task<List<RoleAssignment>> LoadForUser(User? u, IDBManager manager)
+        {
+            List<DbEntity> loadResultList = await manager.Load(SetLoadQuery, LoadElems, args: u);
+            List<RoleAssignment> result = new();
+            foreach (RoleAssignment ra in loadResultList.Cast<RoleAssignment>())
+            {
+                ra.AssignedUser = u;
+                result.Add(ra);
+            }
+                
+            return result;
+        }
+
+        public static void SetLoadQuery(IDbCommand cmd, params object[] args)
+        {
+            cmd.CommandText = "SELECT id, user_id, role_id FROM user_role_map WHERE user_id = @UID";
+            if (args.Length != 1 || !(args[0] is User))
+                throw new ArgumentException("loader needs single user as argument");
+            IDataParameter uid = cmd.CreateParameter();
+            uid.ParameterName = "UID";
+            uid.Value = ((User)args[0]).Id;
+            cmd.Parameters.Add(uid);
+        }
+
+        public static List<DbEntity> LoadElems(IDataReader reader)
+        {
+            List<DbEntity> result = new List<DbEntity>();
+            while (reader.Read())
+            {
+                RoleAssignment ra = new();
+                ra.Id = (uint)reader.GetInt32(0);
+                if (!reader.IsDBNull(1)) ra.UserId = reader.GetInt32(1);
+                if (!reader.IsDBNull(2)) ra.RoleId = reader.GetInt32(2);                
+                result.Add(ra);
+            }
+            return result;
+        }
+
+        #endregion
+
+        #region overrides
+
         public override void SetUpdate(IDbCommand cmd)
         {
             throw new NotImplementedException();
@@ -30,8 +78,27 @@ namespace brecal.model
 
         public override void SetDelete(IDbCommand cmd)
         {
-            throw new NotImplementedException();
+            cmd.CommandText = "DELETE FROM user_role_map WHERE id = @ID";
+
+            IDataParameter idParam = cmd.CreateParameter();
+            idParam.ParameterName = "ID";
+            idParam.Value = this.Id;
+            cmd.Parameters.Add(idParam);
         }
 
+        public override string ToString()
+        {
+            if (this.AssignedRole == null)
+            {
+                return $"{Id}: <defunct role>";
+            }
+            else
+            {
+                return $"{AssignedRole.Name}:{Id}";
+            }
+        }
+
+        #endregion
+
     }
 }