Hi!

I'm trying to build all data objects for my football web application, and have some issues with many_many relations. I've created a modelAdmin for managing teams and competitions, and I've listed the relevant objects below.

My problem is that I get the following error when trying to save a "Team" (Displayed as "Internal Server Error" in admin), but I got the db-entry for the Team.

Any help appreciated!

[17-Dec-2013 01:12:47] Error at framework/model/DataObject.php line 1849: Inverse component of Competition not found (Team) (http://localhost/admin/teams/Team/EditForm/field/Team/item/8)
[17-Dec-2013 01:12:47] Error at framework/model/DataObject.php line 1860: Orphaned $belongs_many_many value for Team.Competitions (http://localhost/admin/teams/Team/EditForm/field/Team/item/8)
[17-Dec-2013 01:12:47] Error at framework/model/DataQuery.php line 116: DataList::create Can't find data classes (classes linked to tables) for . Please ensure you run dev/build after creating a new DataObject. (http://localhost/admin/teams/Team/EditForm/field/Team/item/8)
[17-Dec-2013 01:12:47] Error at framework/core/Core.php line 152: singleton() Called without a class (http://localhost/admin/teams/Team/EditForm/field/Team/item/8)
[17-Dec-2013 01:12:47] Error at framework/core/Core.php line 154: singleton() passed bad class_name: NULL (http://localhost/admin/teams/Team/EditForm/field/Team/item/8)
[17-Dec-2013 01:12:47] Error at framework/control/injector/InjectionCreator.php line 18: Uncaught ReflectionException: Class  does not exist (http://localhost/admin/teams/Team/EditForm/field/Team/item/8)

The classes

class Competition extends DataObject {
	private static $db = array(
		'Title' => 'Varchar',
		'StartDate' => 'Date',
		'EndDate' => 'Date'
	);

	public function getCMSFields() {
		$fields = parent::getCMSFields();
		return $fields;
	}
}

class FootballCompetition extends Competition {
	private static $has_many = array(
		'Matches' => 'Match'
	);

	private static $many_many = array(
                'Teams' => 'Team'
    );
}

class Team extends DataObject {
	private static $db = array(
		'Title' => 'Varchar',
		'Shortname' => 'Varchar'
	);

	private static $has_many = array(
		'MatchesHome' => 'Match.HomeTeam',
		'MatchesAway' => 'Match.AwayTeam',
	);

	private static $belongs_many_many = array(
                'Competitions' => 'Competition'
    );

	function getMatches() { 
		return DataObject::get('Match', "HomeTeamID = '$this->ID' OR AwayTeamID = '$this->ID'"); 
	}
}

class TeamAdmin extends ModelAdmin {
	private static $managed_models = array('Team');
	private static $url_segment = 'teams';
	private $menu_title = 'Team Admin';
}

Hi, I've solved this myself.

The problem was that a "Team" > belongs_many_many > Competition. It should be "FootballCompetition" instead of "Competition".

Hi, i'm also developing a similar data model, but also include seasons, have you made it using seasons?