Index: modules/node/node.api.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.api.php,v
retrieving revision 1.13
diff -r1.13 node.api.php
111a112,141
>  * Alter permissions for a node to be written to the database.
>  *
>  * Node access modules establish rules for access to content.
>  * Before node access records are saved to the database, this hook
>  * is called and allows modules to modify the grants array by reference.
>  * This hook allows developers to write custom modules which alter the
>  * ways that mutliple node access modules interact. The preferred use of 
>  * this hook is in a module that bridges mutliple node access modules
>  * with a configurable behavior, as shown in the example by the variable
>  * 'example_alter_node_access'.
>  *
>  * @param &$grants
>  * The $grants array returned by hook_node_access_records.
>  *
>  * @ingroup node_access
>  */
> function hook_node_access_records_alter(&$grants) {
>   // Check to see if we have enabled complex behavior.
>   if (variable_get('example_alter_node_access', FALSE) && !empty($grants)) {
>     // Our module removes the author grant.
>     foreach ($grants as $gid => $grant) {
>       if ($grant['realm'] == 'example_author') {
>         unset($grants[$gid]);
>       }
>     }
>     sort($grants);
>   }
> }
> 
> /**
Index: modules/node/node.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.module,v
retrieving revision 1.1033
diff -r1.1033 node.module
2527a2528,2533
>  * After the default grants have been loaded, we allow modules to alter
>  * the grants array by reference. This hook allows for complex business
>  * logic to be applied when integrating multiple node access modules.
>  *
>  * @see hook_node_access_records()
>  *
2535a2542,2544
>   // Let modules alter the grants.
>   drupal_alter('node_access_records', $grants);
>   // If no grants are set, then use the default grant.
2540c2549
<     // retain grants by highest priority
---
>     // Retain grants by highest priority.
Index: modules/node/node.test
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.test,v
retrieving revision 1.19
diff -r1.19 node.test
639a640,676
> 
> class NodeAccessRecordsAlterUnitTest extends DrupalWebTestCase {
>   public static function getInfo() {
>     return array(
>       'name' => t('Node access records alter'),
>       'description' => t('Test hook_node_access_records_alter when acquiring grants.'),
>       'group' => t('Node'),
>     );
>   }
> 
>   function setUp() {
>     // Enable dummy module that implements hook_node_grants, hook_node_access_records, and hook_node_access_records_alter.
>     parent::setUp('node_test');
>   }
> 
>   function testGrantAlter() {
>     // Create an article node.
>     $node1 = $this->drupalCreateNode(array('type' => 'article'));
>     $this->assertTrue(node_load($node1->nid), t('Article node created.'));
> 
>     // Check to see if grants added by node_test_node_access_records made it in.
>     $records = db_query('SELECT realm, gid FROM {node_access} WHERE nid = %d', $node1->nid)->fetchAll();
>     $this->assertEqual(count($records), 1, t('Returned the correct number of rows.'));
>     $this->assertEqual($records[0]->realm, 'article_realm', t('Grant with article_realm acquired for node without alteration.'));
>     $this->assertEqual($records[0]->gid, 1, t('Grant with gid = 1 acquired for node without alteration.'));
>     
>     // Create a page node.
>     $node2 = $this->drupalCreateNode(array('type' => 'page'));
>     $this->assertTrue(node_load($node2->nid), t('Page node created.'));
> 
>     // Check to see if grant added by node_test_node_access_records got altered by node_test_node_access_records_alter.
>     $records = db_query('SELECT realm, gid FROM {node_access} WHERE nid = %d', $node2->nid)->fetchAll();   
>     $this->assertEqual(count($records), 1, t('Returned the correct number of rows.'));
>     $this->assertEqual($records[0]->realm, 'alter_realm', t('Altered grant with alter_realm acquired for node.'));
>     $this->assertEqual($records[0]->gid, 2, t('Altered grant with gid = 2 acquired for node.'));
>   }
> }
Index: modules/node/tests/node_test.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/tests/node_test.module,v
retrieving revision 1.1
diff -r1.1 node_test.module
18a19,71
> 
> /*
>  * Implementation of hook_node_grants().
>  */
> function node_test_node_grants($account, $op) {
>   // This dummy hook needs to be here or else node_access_write_grants will write nothing.
>   return array();
> }
> 
> /**
>  * Implementation of hook_node_access_records().
>  */
> function node_test_node_access_records($node) {
>   $grants = array();
>   if ($node->type == 'article') {
>     // Create grant in arbitrary article_realm for article nodes.
>     $grants[] = array(
>       'realm' => 'article_realm',
>       'gid' => 1,
>       'grant_view' => 1,
>       'grant_update' => 0,
>       'grant_delete' => 0,
>       'priority' => 0,
>     );
>   }
>   elseif ($node->type == 'page') {
>     // Create grant in arbitrary page_realm for page nodes.
>     $grants[] = array(
>       'realm' => 'page_realm',
>       'gid' => 1,
>       'grant_view' => 1,
>       'grant_update' => 0,
>       'grant_delete' => 0,
>       'priority' => 0,
>     );
>   }
>   return $grants;
> }
> 
> /**
>  * Implementation of hook_node_access_records_alter().
>  */
> function node_test_node_access_records_alter(&$grants) {
>   if (!empty($grants)) {
>     foreach ($grants as $key => $grant) {
>       // Alter grant from page_realm to alter_realm and modify the gid.
>       if ($grant['realm'] == 'page_realm') {
>         $grants[$key]['realm'] = 'alter_realm';
>         $grants[$key]['gid'] = 2;
>       }
>     }
>   }
> }