FactoryGirl\Provider\Doctrine\EntityDef::defaultDefsFromMetadata PHP Method

    private function defaultDefsFromMetadata()
    {
        $defaultEntity = $this->getEntityMetadata()->newInstance();
        $allFields = array_merge($this->metadata->getFieldNames(), $this->metadata->getAssociationNames());
        foreach ($allFields as $fieldName) {
            if (!isset($this->fieldDefs[$fieldName])) {
                $defaultFieldValue = $this->metadata->getFieldValue($defaultEntity, $fieldName);
                if ($defaultFieldValue !== null) {
                    $this->fieldDefs[$fieldName] = function () use($defaultFieldValue) {
                        return $defaultFieldValue;
                    };
                } else {
                    $this->fieldDefs[$fieldName] = function () {
                        return null;
                    };
                }
            }
        }
    }