EntityRepository.php

/**
     * Adds support for magic finders.
     *
     * @return array|object The found entity/entities.
     * @throws BadMethodCallException  If the method called is an invalid find* method
     *                                 or no find* method at all and therefore an invalid
     *                                 method call.
     */
    public function __call($method, $arguments)
    {
        switch (true) {
            case (0 === strpos($method, 'findBy')):
                $by = substr($method, 6);
                $method = 'findBy';
                break;

            case (0 === strpos($method, 'findOneBy')):
                $by = substr($method, 9);
                $method = 'findOneBy';
                break;

            default:
                throw new \BadMethodCallException(
                    "Undefined method '$method'. The method name must start with ".
                    "either findBy or findOneBy!"
                );
        }

        if (empty($arguments)) {
            throw ORMException::findByRequiresParameter($method . $by);
        }

        $fieldName = lcfirst(\Doctrine\Common\Util\Inflector::classify($by));

        if ($this->_class->hasField($fieldName) || $this->_class->hasAssociation($fieldName)) {
            switch (count($arguments)) {
                case 1:
                    return $this->$method(array($fieldName => $arguments[0]));

                case 2:
                    return $this->$method(array($fieldName => $arguments[0]), $arguments[1]);

                case 3:
                    return $this->$method(array($fieldName => $arguments[0]), $arguments[1], $arguments[2]);

                case 4:
                    return $this->$method(array($fieldName => $arguments[0]), $arguments[1], $arguments[2], $arguments[3]);

                default:
                    // Do nothing
            }
        }

        throw ORMException::invalidFindByCall($this->_entityName, $fieldName, $method.$by);
    }