[TYPO3-english] TYPO3 extension: attaching an object to an objectstorage throws a MySQL database error

[christian ewigfrost]

One of my TYPO3 extension classes uses a property (checklist) that is an object storage.

    class Kaufmnnisch extends \TYPO3\CMS\Extbase\DomainObject\AbstractEntity
    {
    	
    	public function __construct(){
    		
    		$this->checklist = new \TYPO3\CMS\Extbase\Persistence\ObjectStorage();
    		
    	
    
    	}
    		
    	
        /**
         * checklist
         *
         * @var Tx_Extbase_Persistence_ObjectStorage
    	 * @lazy
         */
        protected $checklist;
    
     /**
         * Returns the checklist
         *
         * @return Tx_Extbase_Persistence_ObjectStorage $checklist
         */
        public function getChecklist()
        {
            return $this->checklist;
        }
    
        /**
         * Sets the checklist
         *
         * @param Tx_Extbase_Persistence_ObjectStorage $checklist
         * @return void
         */
        public function setChecklist($checklist)
        {
            $this->checklist = $checklist;
        }
    
        /**
         * Returns the boolean state of checklist
         *
         * @return bool
         */
        public function isChecklist()
        {
            return $this->checklist;
        }

To that object storage i want to be able to add objects of the class 'Checkobject' which has just two propeties: 'name' and 'checked'...
Within the controller of the class i have following code in the createAction:

    $Kundenauftragliegtvor = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('...\Kundentermine\Domain\Model\Checkobject');
    		$Kundenauftragliegtvor->setName('Kundenauftrag liegt vor');
    		$Kaufmnnisch->getChecklist()->attach($Kundenauftragliegtvor);

So basically when creating an object of that class i want to initially create the object $Kundenauftragliegtvor (of course later i want to add additional objects of that class, but thats another story)... BUT: When creating an object of the class Kaufmnnisch I get the following error:

    Incorrect integer value: '' for column 'checklist' at row 1 
It seems that attaching the object to the objectstorage 'checklist' seems to create the error in my MySQL database. I suspect that my TCA (specifically the part for the objectstorage) isn't correct:

     'checklist' => [
                'exclude' => true,
                'label' => 'LLL:EXT:kundentermine/Resources/Private/Language/locallang_db.xlf:tx_kundentermine_domain_model_kaufmnnisch.checklist',
                'config' => [
                    'type' => 'passthrough',
                    'items' => [
                        '1' => [
                            '0' => 'LLL:EXT:lang/locallang_core.xlf:labels.enabled'
                        ]
                    ],
                    'default' => 0,
                ]
            ],