Add defaultPositionValue property

Author: pionl

README.md

@@ -142,6 +142,7 @@ You can set:
 * *string* `positionColumn` *to enable overriding for the position column*
 * *boolean* `disablePositionUpdate` *disables the updated of other entries*
 * *string|array* `positionGroup` *builds a filter from columns for position calculation. Supports single column or multiple columns*
+* *string* `defaultPositionValue` *allows returning different value when position is empty string or null. Default value is null*
 
 #### PositionScopeTrait
 

src/Traits/BasePositionTrait.php

@@ -48,7 +48,8 @@ public function setPosition($value)
     protected function setPositionAttribute($value)
     {
         // Convert to numeric value if needed
-        $finalValue = is_null($value) || $value === '' ? null : intval($value);
+        $finalValue = is_null($value) || $value === '' ?
+            $this->positionOption('defaultPositionValue', null) : intval($value);
 
         $this->attributes['position'] = $finalValue;
     }

src/Traits/PositionTrait.php

@@ -1,4 +1,5 @@
 <?php
+
 namespace Pion\Support\Eloquent\Position\Traits;
 
 use Pion\Support\Eloquent\Position\PositionObserver;
@@ -8,6 +9,7 @@
 /**
  * Trait PositionTrait
  *
+ * @property mixed        defaultPositionValue  Setup default value
  * @property array        attributes
  * @property string       positionColumn        to enable overriding for the position column
  * @property boolean      disablePositionUpdate disables the updated of other entries