[9.x] Add missing method to View/ComponentAttributeBag

src/Illuminate/View/ComponentAttributeBag.php

@@ -69,6 +69,17 @@ public function has($key)
  return array_key_exists($key, $this->attributes);
  }
 
+ /**
+ * Determine if a given attribute is missing from the attribute array.
+ *
+ * @param string $key
+ * @return bool
+ */
+ public function missing($key)
+ {
+ return ! $this->has($key, $this->attributes);
+ }
+
  /**
  * Only include the given attribute from the attribute array.
  *

tests/View/ViewComponentAttributeBagTest.php

@@ -94,4 +94,14 @@ public function testAttributeRetrieval()
  'test-extract-2' => 'defaultValue',
  ]));
  }
+
+ public function testAttibuteExistence()
+ {
+ $bag = new ComponentAttributeBag(['name' => 'test']);
+
+ $this->assertTrue((bool) $bag->has('name'));
+ $this->assertFalse((bool) $bag->missing('name'));
+ $this->assertFalse((bool) $bag->has('class'));
+ $this->assertTrue((bool) $bag->missing('class'));
+ }
 }