Made user controller working mostly. Not everything is tested but seems good

src/admin/common/models/user.php

@@ -114,6 +114,12 @@ class CommonClubsModelUser extends AbstractCommonClubsModel
         $this->setValue('password', $hash);
     }
     
+    public function isPasswordSet()
+    {
+        $password = $this->getValues()['password'];
+        return isset($password) && strlen($password) > 0;
+    }
+    
     public function getPositions()
     {
         return $this->fetchAssociatedElements(new CommonClubsModelFactoryUserassoc(), 'userid');
@@ -139,7 +145,7 @@ class CommonClubsModelUser extends AbstractCommonClubsModel
         return true;
     }
     
-    public function isUsernameSuitable($user)
+    public function isUsernameFree($user)
     {
         $factory = new CommonClubsModelFactoryUser();
         $users = $factory->loadElements(null, null, function($q) use ($user){
@@ -167,5 +173,33 @@ class CommonClubsModelUser extends AbstractCommonClubsModel
         $db->execute();
     }
     
+    public function dataIsValid()
+    {
+        if(! parent::dataIsValid())
+            return false;
+        
+        if(! $this->usernameIsValid())
+        {
+            return false;
+        }
+        
+        return true;
+    }
+    
+    private function usernameIsValid()
+    {
+        $factory = $this->getFactory();
+        $medb = $factory->loadById($this->getId(), false);
+        
+        if($medb !== null && $medb->getUserName() === $this->getUsername())
+            // No change was made
+            return true;
+        
+        if(! $this->isUsernameFree($this->getUsername()) )
+            return false;
+        
+        return true;
+    }
+    
 }