[5.6] Disable model relationship touching

src/Illuminate/Database/Eloquent/Model.php

@@ -124,6 +124,13 @@ abstract class Model implements ArrayAccess, Arrayable, Jsonable, JsonSerializab
      */
     protected static $globalScopes = [];
 
+    /**
+     * The list of models classes that should not be affected with touch.
+     *
+     * @var array
+     */
+    protected static $ignoreOnTouch = [];
+
     /**
      * The name of the "created at" column.
      *
@@ -197,6 +204,51 @@ protected static function bootTraits()
         }
     }
 
+    /**
+     * Disables relationship model touching for the current class during given callback scope.
+     *
+     * @param callable $callback
+     */
+    public static function withoutTouching(callable $callback)
+    {
+        static::withoutTouchingOn([static::class], $callback);
+    }
+
+    /**
+     * Disables relationship model touching for the given model classes during given callback scope.
+     *
+     * @param array $models
+     * @param callable $callback
+     */
+    public static function withoutTouchingOn(array $models, callable $callback)
+    {
+        static::$ignoreOnTouch = array_values(array_merge(static::$ignoreOnTouch, $models));
+
+        try {
+            call_user_func($callback);
+        } finally {
+            static::$ignoreOnTouch = array_values(array_diff(static::$ignoreOnTouch, $models));
+        }
+    }
+
+    /**
+     * @param string $class The class name to check. Defaults to current class.
+     *
+     * @return bool
+     */
+    public static function isIgnoringTouch($class = null)
+    {
+        $class = $class ?: static::class;
+
+        foreach (static::$ignoreOnTouch as $ignoredClass) {
+            if ($class === $ignoredClass || is_subclass_of($class, $ignoredClass)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     /**
      * Clear the list of booted models so they will be re-booted.
      *

src/Illuminate/Database/Eloquent/Relations/Relation.php

@@ -161,9 +161,13 @@ public function get($columns = ['*'])
      */
     public function touch()
     {
-        $column = $this->getRelated()->getUpdatedAtColumn();
+        $model = $this->getRelated();
 
-        $this->rawUpdate([$column => $this->getRelated()->freshTimestampString()]);
+        if (! $model::isIgnoringTouch()) {
+            $column = $model->getUpdatedAtColumn();
+
+            $this->rawUpdate([$column => $model->freshTimestampString()]);
+        }
     }
 
     /**