From cbd59c217f3bc4a701afa38419d8a28e1367b070 Mon Sep 17 00:00:00 2001
From: kj <webmaster@outcontrol.net>
Date: Sat, 24 Oct 2020 04:47:39 -0400
Subject: [PATCH] Added setNull method to ModelMysql.

---
 src/Libs/ModelMySQL.php | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/src/Libs/ModelMySQL.php b/src/Libs/ModelMySQL.php
index abb6036..adcbdbc 100644
--- a/src/Libs/ModelMySQL.php
+++ b/src/Libs/ModelMySQL.php
@@ -17,6 +17,7 @@ use Libs\Database;
 class ModelMySQL {
   
   public $id;
+  protected $toNull = [];
   
   static protected $primaryKey = 'id';
   static protected $ignoreSave = ['id'];
@@ -225,7 +226,13 @@ class ModelMySQL {
     foreach ($atts as $key => $value) {
       if (isset($value)) {
         $value = static::db()->real_escape_string($value);
-        $set[]="$key='$value'";
+        if (in_array($key, $this->toNull))
+          $set[]="$key=NULL";
+        else
+          $set[]="$key='$value'";
+      } else {
+        if (in_array($key, $this->toNull))
+          $set[]="$key=NULL";
       }
     }
     
@@ -712,5 +719,23 @@ class ModelMySQL {
     
     return $instances;
   }
+
+  /*
+   * Permite definir como nulo el valor de un atributo.
+   * Sólo funciona para actualizar un elemento de la BD, no para insertar.
+   *
+   * @param array $atts
+   */
+  public function setNull($atts) {
+    if (!isset($this->id))
+      throw new \Exception(
+        "\nEl método setNull sólo funciona para actualizar, no al insertar."
+      );
+    
+    foreach ($atts as $att) {
+      if (!in_array($att, $this->toNull))
+        $this->toNull[] = $att;
+    }
+  }
 }
 ?>