CakePHP relationships suddenly started causing "Maximum function nesting level ..."

[blue-eye-labs]

Hi all,

I've been making some changes to a project I'm developing and I have a model as follows:

/**
 * The projectlink model represents the link Project HABTM Project.
 * Because of the complexity of this relationship there are two relationships: Project HABTM Parent(Project) and Project HABTM Child(Project).
*/

class ProjectLink extends AppModel {
    var $name = "ProjectLink";
    
    var $actsAs = array("Containable");
    
    var $belongsTo = array(
        "Parent"    =>    array(
            "className"        =>    "Project",
            "foreignKey"    =>    "from_project_id"
        ),
        "Child"        =>    array(
            "className"        =>    "Project",
            "foreignKey"    =>    "to_project_id"
        )
    );
} 

It's been working for at least a few months but now when I go to any of the actions relating to this model I get the following from xdebug:

Fatal error: Maximum function nesting level of '100' reached, aborting! in /Users/gid/Sites/primary-energy-research/cake/libs/debugger.php on line 248

The following function cycle is getting repeated over and over again (and the cycles are nested inside each other):

1. ClassRegistry->init( )
2. Model->__construct( )
3. Model->__createLinks( )
4. Model->__constructLinkedModel( )

So it looks like the relationships are going round in a spiral until it hits:

1. ClassRegistry->init( )
2. ClassRegistry->__duplicate( )
3. ClassRegistry->isKeySet( )
4. Debugger->handleError( )

Unfortunately after that it's got to 100 nested functions so it bails.

Any ideas guys?