Should address issue #38 where some people are not getting cache clears

system/src/Grav/Common/Cache.php

@@ -66,6 +66,9 @@ public function init(Grav $grav)
         $this->key = substr(md5(($prefix ? $prefix : 'g') . $uri->rootUrl(true) . $this->config->key . GRAV_VERSION), 2, 8);
 
         $this->driver = $this->getCacheDriver();
+
+        // Set the cache namespace to our unique key
+        $this->driver->setNamespace($this->key);
     }
 
     /**
@@ -132,7 +135,6 @@ public function getCacheDriver()
     public function fetch($id)
     {
         if ($this->enabled) {
-            $id = $this->key . $id;
             return $this->driver->fetch($id);
         } else {
             return false;
@@ -149,7 +151,6 @@ public function fetch($id)
     public function save($id, $data, $lifetime = null)
     {
         if ($this->enabled) {
-            $id = $this->key . $id;
             $this->driver->save($id, $data, $lifetime);
         }
     }

system/src/Grav/Common/Filesystem/Folder.php

@@ -56,7 +56,6 @@ public static function lastModifiedFile($path)
             }
 
         }
-
         return $last_modified;
     }
 

system/src/Grav/Common/Page/Page.php

@@ -106,7 +106,7 @@ public function __construct($array = array())
     public function init($file)
     {
         $this->filePath($file->getPathName());
-        $this->modified(filemtime($file->getPath()));
+        $this->modified($file->getMTime());
         $this->id($this->modified().md5($this->filePath()));
         $this->header();
         $this->slug();

system/src/Grav/Common/Page/Pages.php

@@ -426,10 +426,17 @@ protected function recurse($directory = PAGES_DIR, Page &$parent = null)
             throw new \RuntimeException('Fatal error when creating page instances.');
         }
 
+        $last_modified = 0;
+
         /** @var \DirectoryIterator $file */
         foreach ($iterator as $file) {
             $name = $file->getFilename();
 
+            $date = $file->getMTime();
+            if ($date > $last_modified) {
+                $last_modified = $date;
+            }
+
             if ($file->isFile() && Utils::endsWith($name, CONTENT_EXT)) {
 
                 $page->init($file);
@@ -465,8 +472,14 @@ protected function recurse($directory = PAGES_DIR, Page &$parent = null)
                     $this->grav->fireEvent('onFolderProcessed', new Event(['page' => $page]));
                 }
             }
+
         }
 
+        // Override the modified and ID so that it takes the latest change
+        // into account
+        $page->modified($last_modified);
+        $page->id($last_modified.md5($page->filePath()));
+
         // Sort based on Defaults or Page Overridden sort order
         $this->children[$page->path()] = $this->sort($page);