- Added Exists method

src/Repository.php

@@ -100,6 +100,11 @@ class Repository
         return Ulmus::runSelectQuery($this->queryBuilder, $this->adapter)->fetchColumn(0);
     }
 
+    public function exists(mixed $primaryKey) : bool
+    {
+        return $this->wherePrimaryKey($primaryKey)->count() !== 0;
+    }
+    
     public function deleteOne()
     {
         return $this->limit(1)->deleteSqlQuery()->runDeleteQuery();