feat: add scope for retrieving root translations

Author: athphane

src/DbTranslatable/IsDbTranslatable.php

@@ -2,6 +2,7 @@
 
 namespace Javaabu\Translatable\DbTranslatable;
 
+use Illuminate\Database\Eloquent\Builder;
 use Javaabu\Translatable\Contracts\Translatable;
 use Javaabu\Translatable\Exceptions\CannotDeletePrimaryTranslationException;
 use Javaabu\Translatable\Exceptions\FieldNotAllowedException;
@@ -248,6 +249,11 @@ public function isRootTranslation(): bool
         return empty($this->translatable_parent_id);
     }
 
+    public function scopeRootTranslations(Builder $builder)
+    {
+        return $builder->whereNull('translatable_parent_id');
+    }
+
     /**
      * Check if the current translation can update its parent translation.
      */