Field Permissions Problem

Archived from the Xataface Users forum.

dbaron2 — Thu Oct 22, 2009 3:29 am

Hello,

I have successfully implemented field level permissions using the function below, however when I add the line to set permissions based on another field (status_id) I get a fatal error:

Code: Select all

function short_description__permissions(&$record){         $auth =& Dataface_AuthenticationTool::getInstance();         $user =& $auth->getLoggedInUser();         $role = $user->val('user_role');         if ($role == "ADMIN") return null;         if ($role == "MANAGER") return null;         if ($record->val('status_id') == "6") return array('edit'=>0);         $user_type = $user->val('user_type');         if ($user_type == "T") return null;         if ($user_type == "E") return array('edit'=>0);     }

Fatal error: Call to a member function val() on a non-object in…

What am I doing wrong?

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shannah — Thu Oct 22, 2009 9:08 am

In any permissions method you should always check if:

1. The user exists

2. The record exists

before calling methods on them.

E.g.

if you call

$user->val(‘..’)

but user is null (which is possible if nobody is logged in yet), then you’ll get a fatal error like this one. Better to do something like:

if ( $user and $user->val(‘..’) ){

..

}

rather than

if ($user->val(‘..’){

..

}

Similar with $record, it could be null if its trying to find general permissions for a table and not on a particular record.

So instead of

if ( $record->val(‘…’) )

use

if ( $record and $record->val(‘…’) )

-Steve

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dbaron2 — Thu Oct 22, 2009 10:15 pm

Thanks! Checking for $record object existence fixed my problem