Drupal 7 Module Development

Node Access
From here, we are required to build a well-formed $grants array which defines the
rules for our module. This array matches the schema of the {node_access} table and
adds a 'priority' key. For our module, we return an array element for each role:
// Initialize a $grants array.
$grants = array();
// Iterate through the $roles and get our grants.
// We use the role id as the grant id, so let's name it that way for
clarity.
foreach ($roles as $grant_id) {
$grants[] = array(
'realm' => 'role_access', // The name of our module.
'gid' => $grant_id,
'grant_view' => 1,
'grant_update' => 1,
'grant_delete' => 1,
'priority' => 0, // If not zero, other grants are ignored.
);
}
// Return our grants.
return $grants;
}
Inspecting the output of this code shows us:
$grants[0] = array(
'realm' => 'role_access',
'gid' => 2,
'grant_view' => 1,
'grant_update' => 1,
'grant_delete' => 1,
'priority' => 0,
),
$grants[1] = array(
'realm' => 'role_access',
'gid' => 4,
'grant_view' => 1,
'grant_update' => 1,
'grant_delete' => 1,
'priority' => 0,
);
Note that we do not need to identify the node itself. The API handles that for us.
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