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

    public function getFieldDefs()
    {
        return $this->fieldDefs;
    }

 protected function checkFieldOverrides(EntityDef $def, array $fieldOverrides)
 {
     $extraFields = array_diff(array_keys($fieldOverrides), array_keys($def->getFieldDefs()));
     if (!empty($extraFields)) {
         throw new Exception("Field(s) not in " . $def->getEntityType() . ": '" . implode("', '", $extraFields) . "'");
     }
 }