diff --git a/src/behaviors/UploadedFileBehavior.php b/src/behaviors/UploadedFileBehavior.php
new file mode 100644
index 0000000..4049a48
--- /dev/null
+++ b/src/behaviors/UploadedFileBehavior.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace yiiaddon\behaviors;
+
+use yii\db\BaseActiveRecord;
+use yii\web\UploadedFile;
+
+class UploadedFileBehavior extends \yii\behaviors\AttributeBehavior
+{
+    
+    public $fileAttribute = 'file';
+    
+    public $value;
+
+    /**
+     * @inheritdoc
+     */
+    public function init()
+    {
+        parent::init();
+        if (empty($this->attributes)) {
+            $this->attributes = [
+                BaseActiveRecord::EVENT_BEFORE_VALIDATE => $this->fileAttribute,
+            ];
+        }
+    }
+    
+    protected function getValue($event)
+    {
+        if ($this->value === null) {
+            return UploadedFile::getInstance($this->owner, $this->fileAttribute);
+        }
+
+        return parent::getValue($event);
+    }
+
+}
diff --git a/src/components/ActiveRecordCollection.php b/src/components/ActiveRecordCollection.php
new file mode 100644
index 0000000..6ec53a5
--- /dev/null
+++ b/src/components/ActiveRecordCollection.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace yiiaddon\components;
+
+use yiiaddon\helpers\ArrayHelper;
+use yiiaddon\helpers\ArrayObject;
+
+class ActiveRecordCollection extends \yiiaddon\helpers\ArrayObject
+{
+
+    public function map($key, $value)
+    {
+        return new ArrayObject(ArrayHelper::map($this, $key, $value));
+    }
+
+}
\ No newline at end of file
diff --git a/src/db/ActiveQuery.php b/src/db/ActiveQuery.php
new file mode 100644
index 0000000..83d449c
--- /dev/null
+++ b/src/db/ActiveQuery.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace yiiaddon\db;
+
+use yiiaddon\components\ActiveRecordCollection;
+
+class ActiveQuery extends \yii\db\ActiveQuery
+{
+
+    public function all($db = null)
+    {
+        return new ActiveRecordCollection(parent::all($db));
+    }
+
+}
\ No newline at end of file
diff --git a/src/db/ActiveRecord.php b/src/db/ActiveRecord.php
new file mode 100644
index 0000000..dad78c4
--- /dev/null
+++ b/src/db/ActiveRecord.php
@@ -0,0 +1,26 @@
+<?php
+
+namespace yiiaddon\db;
+
+use Yii;
+use yiiaddon\helpers\ArrayHelper;
+
+class ActiveRecord extends \yii\db\ActiveRecord
+{
+
+    public static function find()
+    {
+        return Yii::createObject(ActiveQuery::className(), [get_called_class()]);
+    }
+
+    public function parseAttribute($attribute, $defalts = [ 'format' => "text", 'value' => '( NOT SET )' ])
+    {
+       return ArrayHelper::parseAttribute($this, $attribute, $defalts);
+    }
+
+    public function getValue($attribute, $defalt = '( NOT SET )')
+    {
+        return $this->parseAttribute($attribute, ['value' => $defalt])->value;
+    }
+
+}
\ No newline at end of file
diff --git a/src/db/Rankable.php b/src/db/Rankable.php
new file mode 100644
index 0000000..ffaf500
--- /dev/null
+++ b/src/db/Rankable.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace yiiaddon\db;
+
+use Yii;
+use yii\db\Expression;
+
+trait Rankable
+{
+
+    public $rank_filed = 'rank';
+
+    public $rank_group = false;
+
+    public function getRankField()
+    {
+        return 'rank';
+    }
+
+    public function getRankGoup()
+    {
+        return false;
+    }
+
+    public function getNextRank()
+    {
+        $query = self::find();
+
+        if ( $this->rankGoup ) {
+            $query->where([$this->rankGroup => $this->{$this->rankGroup}]);
+        }
+        
+        return $query->count();
+    }
+
+    public function changeRank( $new_rank )
+    {
+        $rank_filed = $this->rankField;
+        $group      = $this->rankGoup;
+        $old_rank   = $this->{ $rank_filed };
+
+        if ( $new_rank == $old_rank ) {
+            return true;
+        }
+
+        $value = '';
+
+        if ( $new_rank > $old_rank ) {
+            $value = $rank_filed . ' - 1';
+            $where = $rank_filed . '>= :rank1 AND ' . $rank_filed . ' <= :rank2';
+        } else {
+            $value = $rank_filed . ' + 1';
+            $where = $rank_filed . ' <= :rank1 AND ' . $rank_filed . ' >= :rank2';
+        }
+
+        if ( $group ) {
+            $where .= ' AND ' . $group . ' = ' . $this->{ $group };
+        }
+
+        $query = Yii::$app->db->createCommand()
+            ->update( self::tableName(), [ $rank_filed => new Expression( $value ) ], $where )
+            ->bindValue( ':rank1', $old_rank )
+            ->bindValue( ':rank2', $new_rank )
+            ->execute();
+
+        $this->updateAttributes( [ 'rank' => $new_rank ] );
+
+        return true;
+    }
+
+}