1 files changed, 30 insertions, 0 deletions
diff --git a/sites/all/modules/entity/modules/book.info.inc b/sites/all/modules/entity/modules/book.info.inc
new file mode 100644
index 000000000..96629c365
--- /dev/null
+++ b/sites/all/modules/entity/modules/book.info.inc
@@ -0,0 +1,30 @@
+<?php
+
+/**
+ * @file
+ * Provides info about book nodes.
+ */
+
+/**
+ * Implements hook_entity_property_info_alter() on top of book module.
+ *
+ * @see entity_entity_property_info_alter()
+ */
+function entity_metadata_book_entity_property_info_alter(&$info) {
+  // Add meta-data about the added node properties.
+  $properties = &$info['node']['properties'];
+
+  $properties['book'] = array(
+    'label' => t("Book"),
+    'type' => 'node',
+    'description' => t("If part of a book, the book to which this book page belongs."),
+    'getter callback' => 'entity_metadata_book_get_properties',
+  );
+  $properties['book_ancestors'] = array(
+    'label' => t("Book ancestors"),
+    'type' => 'list<node>',
+    'computed' => TRUE,
+    'description' => t("If part of a book, a list of all book pages upwards in the book hierarchy."),
+    'getter callback' => 'entity_metadata_book_get_properties',
+  );
+}