Add a better mechanism to detect Entity changes

Implement and use a better mechanism to detect changes of attributes of
the Entity objects by using a private variable which keeps track of the
changed Entity attributes ("properties") via the "set" method.

The "insert" and "update" method of the Repository now calls the method
"getModifiedKeys" of the Entity class to get a list of properties which
have been changed and builds the database query accordingly.

This makes the use of "FALSE" as default value for the Entity attributes
obsolete, so they have been set to the initial PHP default ("NULL").

1 files changed, 11 insertions, 5 deletions

diff --git a/core/namespace/ORM/Entity.php b/core/namespace/ORM/Entity.php
index 9cc7755..a19b1f4 100644
--- a/core/namespace/ORM/Entity.php
+++ b/core/namespace/ORM/Entity.php
@@ -6,6 +6,9 @@ abstract class Entity implements EntityInterface {
 	protected $time_insert;
 	protected $time_update;
 
+	# Modified attributes
+	private $_modified = [];
+
 	#===============================================================================
 	# Get attribute
 	#===============================================================================
@@ -17,6 +20,11 @@ abstract class Entity implements EntityInterface {
 	# Set attribute
 	#===============================================================================
 	public function set(string $attribute, $value) {
+		if($this->{$attribute} !== $value) {
+			!in_array($attribute, $this->_modified) &&
+				array_push($this->_modified, $attribute);
+		}
+
 		return $this->{$attribute} = $value;
 	}
 
@@ -39,11 +47,9 @@ abstract class Entity implements EntityInterface {
 	}
 
 	#===============================================================================
-	# Get array with all non-false attributes
+	# Get an array of modified attribute keys
 	#===============================================================================
-	public function getFilteredAttributes(): array {
-		return array_filter(get_object_vars($this), function($value) {
-			return $value !== FALSE;
-		});
+	public function getModifiedKeys(): array {
+		return $this->_modified;
 	}
 }