Add a new resource for managing child item orders.

modules/gallery/helpers/item_ordered_members_rest.php

@@ -0,0 +1,80 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * Gallery - a web based photo album viewer and editor
+ * Copyright (C) 2000-2010 Bharat Mediratta
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+class item_ordered_members_rest_Core {
+  static function get($request) {
+    $item = rest::resolve($request->url);
+    $ordered_members = array();
+    foreach ($item->children() as $child) {
+      $ordered_members[] = rest::url("item", $child);
+    }
+
+    return array(
+      "url" => $request->url,
+      "entity" => array("ordered_members" => $ordered_members));
+  }
+
+  static function put($request) {
+    $item = rest::resolve($request->url);
+    access::required("edit", $item);
+
+    // Verify that we're not adding or removing members this way
+    if (count($request->params->ordered_members) != $item->children_count()) {
+      throw new Rest_Exception("Bad Request", 400);
+    }
+
+    $ordered_members = array();
+    foreach ($request->params->ordered_members as $url) {
+      $member = rest::resolve($url);
+      if ($member->parent_id != $item->id) {
+        throw new Rest_Exception("Bad Request", 400);
+      }
+      $ordered_members[] = $member;
+    }
+
+    // Update all the weights.  This is a pretty inefficient way to do this if we're just changing
+    // one or two elements, but it's easy.  We could optimize this by looking at the current order
+    // and figuring out which elements have moved and then only changing those values.
+    $i = 0;
+    foreach ($ordered_members as $member) {
+      $member->weight = $i++;
+      $member->save();
+    }
+  }
+
+  static function relationships($resource_type, $resource) {
+    if ($resource_type == "item" && $resource->is_album()) {
+      return array(
+        "item_ordered_members" => array(
+          "url" => rest::url("item_ordered_members", $resource)));
+    }
+  }
+
+  static function resolve($id) {
+    $item = ORM::factory("item", $id);
+    if (!access::can("view", $item) || !$item->is_album()) {
+      throw new Kohana_404_Exception();
+    }
+    return $item;
+  }
+
+  static function url($item) {
+    return url::abs_site("rest/item_ordered_members/{$item->id}");
+  }
+}