Adding isSet, changing scope of hasDefault to protected.

src/Models/Model.php

@@ -124,6 +124,18 @@ public function getOriginal( string $key = null ) {
 		return $key ? $this->original[ $key ] : $this->original;
 	}
 
+	/**
+	 * Whether the property is set or not. This is different from isset() because this considers a `null` value as
+	 * being set. Defaults are considered set as well.
+	 *
+	 * @since TBD
+	 *
+	 * @return boolean
+	 */
+	public function isSet( string $key ): bool {
+		return array_key_exists( $key, $this->attributes ) || $this->hasDefault( $key );
+	}
+
 	/**
 	 * Check if there is a default value for a property.
 	 *
@@ -133,7 +145,7 @@ public function getOriginal( string $key = null ) {
 	 *
 	 * @return bool
 	 */
-	public function hasDefault( string $key ): bool {
+	protected function hasDefault( string $key ): bool {
 		return is_array( $this->properties[ $key ] ) && array_key_exists( 1, $this->properties[ $key ] );
 	}
 

tests/wpunit/ModelTest.php

@@ -282,11 +282,18 @@ public function testShouldSetMultipleAttributes() {
 	 *
 	 * @return void
 	 */
-	public function testHasDefaultValue() {
+	public function testIsSet() {
 		$model = new MockModel();
-		$this->assertTrue( $model->hasDefault( 'firstName' ) );
-		$this->assertTrue( $model->hasDefault( 'emails' ) );
-		$this->assertFalse( $model->hasDefault( 'lastName' ) );
+
+		// This has a default so we should see as set.
+		$this->assertTrue( $model->isSet( 'firstName' ) );
+
+		// No default, and hasn't been set so show false.
+		$this->assertFalse( $model->isSet( 'lastName' ) );
+
+		// Now we set it, so it should be true - even though we set it to null.
+		$model->lastName = null;
+		$this->assertTrue( $model->isSet( 'lastName' ) );
 	}
 
 	/**