diff --git a/README.md b/README.md
index 9df77cd..cc17d0a 100644
--- a/README.md
+++ b/README.md
@@ -77,7 +77,15 @@ $connect->setSynchronized([
 ]);
 ```
 
-Your entities must use `HasConnectSync` trait. This trait allows you to customize the syncing behavior.
+Your models must use `HasConnectSync` trait. This trait allows you to customize the syncing behavior.
+
+You also need to add this column to your synced tables:
+
+```
+$table->unsignedBigInteger('connect_resource_id')->unique();
+```
+
+_You can customize this column name and the syncing behavior in your model. Take a look at `HasConnectSync`._
 
 Finally, use this command to sync everything:
 
diff --git a/src/Connect.php b/src/Connect.php
index 714fc05..5d225c6 100644
--- a/src/Connect.php
+++ b/src/Connect.php
@@ -22,6 +22,14 @@ class Connect
         'UserTeam'
     ];
 
+    protected static $foreignKeys = [
+        'role_id' => 'Role',
+        'company_id' => 'Company',
+        'team_id' => 'Team',
+        'user_id' => 'User',
+        'user_teams_id' => 'UserTeam'
+    ];
+
     protected $app;
     protected $synchronized = [];
 
@@ -177,16 +185,22 @@ class Connect
         $model_data = $this->getUserData($connect_data['access_token']);
         $model = config('bconnect.model');
 
-        $user = $model::where('email', $model_data['email'])->first() ?? new $model;
-        $user->fill($model_data);
+        if (in_array($model, $this->synchronized)) {
+            $user = $model::findConnectResource($model_data['id']) ?? new $model;
+        }
+        else {
+            $user = $model::where('email', $model_data['email'])->first() ?? new $model;
+        }
+
+        $user->fill($model_data); // TODO
 
         if (in_array($model, $this->synchronized))
-            $user->id = $model_data['id'];
+            $user->{$model::$connectColumnId} = $model_data['id'];
 
         $user->save();
 
         if (in_array($model, $this->synchronized))
-            $user = $model::findOrFail($model_data['id']);
+            $user = $model::findConnectResource($model_data['id']);
 
         $this->updateUserConnectData($user, $connect_data);
 
@@ -320,6 +334,8 @@ class Connect
             $data = $data['connectResourceData'];
         }
 
+        $data = $this->convertForeignKeys($data);
+
         $model::$method($data['id'], $data);
 
         return true;
@@ -362,7 +378,7 @@ class Connect
 
             foreach ($model::all() as $item)
             {
-                if (!in_array(intval($item->id), $identifiers))
+                if (!in_array(intval($item->{$model::$connectColumnId}), $identifiers))
                     $model::onConnectResourceDoesNotExist($item);
             }
         }
@@ -377,9 +393,11 @@ class Connect
         }
 
         $model = $this->synchronized[$resourceType];
-        $item = $model::find($resourceId);
+        $item = $model::findConnectResource($resourceId);
         $method = $this->getEventMethod($item ? 'updated' : 'created');
-        $model::$method($resourceId, $resourceData);
+
+        $data = $this->convertForeignKeys($resourceData);
+        $model::$method($resourceId, $data);
     }
 
     // Routing
@@ -428,4 +446,20 @@ class Connect
     {
         return config('bconnect.url') ?? 'https://connect.bluesquare.io';
     }
+
+    protected function convertForeignKeys($data)
+    {
+        foreach (self::$foreignKeys as $key => $resourceType)
+        {
+            if (!array_key_exists($key, $data)) continue;
+
+            $model = $this->resolveResourceModel($resourceType);
+            if (!in_array(HasConnectSync::class, class_uses($model))) continue;
+
+            $record = $model::findConnectResource($data[$key]);
+            $data[$key] = $record ? $record->id : null;
+        }
+
+        return $data;
+    }
 }
diff --git a/src/Traits/HasConnectSync.php b/src/Traits/HasConnectSync.php
index 519033a..5279d7d 100644
--- a/src/Traits/HasConnectSync.php
+++ b/src/Traits/HasConnectSync.php
@@ -10,32 +10,34 @@ trait HasConnectSync
 
     public static $connectResource;
 
+    public static $connectColumnId = 'connect_resource_id';
+
+    public static function findConnectResource($id)
+    {
+        return self::query()->where(self::$connectColumnId, $id)->first();
+    }
+
     public static function onConnectResourceCreated($id, $data)
     {
-        $record = new self;
-        $record->fill($data);
-        $record->id = $id;
-        $record->save();
-        return true;
+        $record = self::findConnectResource($id) ?? new self;
+        $record->fill($data); // TODO
+        $record->{self::$connectColumnId} = $id;
+        return $record->save();
     }
 
     public static function onConnectResourceUpdated($id, $data)
     {
-        $record = self::find($id) ?? new self;
-        $record->fill($data);
-        $record->id = $id;
-        $record->save();
-        return true;
+        return self::onConnectResourceCreated($id, $data);
     }
 
-    public static function onConnectResourceDeleted($id, $data)
+    public static function onConnectResourceDeleted($id, $data = null)
     {
-        $record = self::find($id);
-        return $record ? $record->delete() : false;
+        $record = self::findConnectResource($id);
+        return $record ? $record->forceDelete() : false;
     }
 
     public static function onConnectResourceDoesNotExist($record)
     {
-        return $record->delete();
+        return $record->forceDelete();
     }
 }