Fixed root nodes not moving

Author: lazychaser

src/NodeTrait.php

@@ -312,7 +312,7 @@ public function siblings($dir = null)
         $parentId = $this->getParentId();
 
         if (is_null($parentId)) {
-            $query->whereNull($this->getParentId());
+            $query->whereNull($this->getParentIdName());
         } else {
             $query->where($this->getParentIdName(), '=', $parentId);
         }

tests/NodeTest.php

@@ -529,7 +529,7 @@ public function testDefaultCategoryIsSavedAsRoot()
         $node = new Category([ 'name' => 'test' ]);
         $node->save();
 
-        $this->assertEquals(21, $node->_lft);
+        $this->assertEquals(23, $node->_lft);
         $this->assertTreeNotBroken();
 
         $this->assertTrue($node->isRoot());
@@ -573,7 +573,7 @@ public function testCreatesNode()
     {
         $node = Category::create([ 'name' => 'test' ]);
 
-        $this->assertEquals(21, $node->getLft());
+        $this->assertEquals(23, $node->getLft());
     }
 
     public function testCreatesViaRelationship()
@@ -663,6 +663,14 @@ public function testParentIdDirtiness()
 
         $this->assertTrue($node->isDirty('parent_id'));
     }
+
+    public function testRootNodesMoving()
+    {
+        $node = $this->findCategory('store');
+        $node->down();
+
+        $this->assertEquals(3, $node->getLft());
+    }
 }
 
 function all($items)

tests/data/categories.php

@@ -11,4 +11,5 @@
                 array('id' => 8, 'name' => 'galaxy', '_lft' => 12, '_rgt' => 13, 'parent_id' => 7),
             array('id' => 9, 'name' => 'sony', '_lft' => 15, '_rgt' => 16, 'parent_id' => 5),
             array('id' => 10, 'name' => 'lenovo', '_lft' => 17, '_rgt' => 18, 'parent_id' => 5),
+    array('id' => 11, 'name' => 'store 2', '_lft' => 21, '_rgt' => 22, 'parent_id' => null),
 );