Sanitize only passed data (#33)

src/Sanitizer.php

@@ -127,13 +127,15 @@ public function sanitize()
         $sanitized = $this->data;
 
         foreach ($this->rules as $attr => $rules) {
-            $value = Arr::get($this->data, $attr);
+            if (Arr::has($this->data, $attr)) {
+                $value = Arr::get($this->data, $attr);
 
-            foreach ($rules as $rule) {
-                $value = $this->applyFilter($rule['name'], $value, $rule['options']);
-            }
+                foreach ($rules as $rule) {
+                    $value = $this->applyFilter($rule['name'], $value, $rule['options']);
+                }
 
-            Arr::set($sanitized, $attr, $value);
+                Arr::set($sanitized, $attr, $value);
+            }
         }
 
         return $sanitized;

tests/SanitizerTest.php

@@ -91,4 +91,22 @@ public function it_throws_exception_if_non_existing_filter()
         ];
         $data = $this->sanitize($data, $rules);
     }
+
+    public function test_it_should_only_sanitize_passed_data()
+    {
+        $data = [
+            'title' => ' Hello WoRlD '
+        ];
+
+        $rules = [
+            'title' => 'trim',
+            'name' => 'trim|escape'
+        ];
+
+        $data = $this->sanitize($data, $rules);
+
+        $this->assertArrayNotHasKey('name', $data);
+        $this->assertArrayHasKey('title', $data);
+        $this->assertEquals(1, count($data));
+    }
 }