Unable to get Doctrine's I18n in code

PHP
1

I have following tables in database

Main Table :


CREATE TABLE IF NOT EXISTS `exam` (
  `eid` int(11) unsigned NOT NULL,
  PRIMARY KEY (`eid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Translation Table:


CREATE TABLE IF NOT EXISTS `exam_translation` (
  `etid` int(11) unsigned NOT NULL,
  `lang` char(2) NOT NULL,
  `title` varchar(1000) DEFAULT NULL,
  `created` datetime NOT NULL,
  `updated` datetime NOT NULL,
  PRIMARY KEY (`etid`,`lang`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

I have following Main Base Model at (APPLICATION_PATH/models/base):


class Model_Base_Exam extends Doctrine_Record  {

    public function  setTableDefinition() {
        $this->setTableName('exam');

        $this->option('type', 'INNODB');
        $this->option('charset', 'utf8');
        $this->option('collate', 'utf8_general_ci');


        $this->hasColumn('eid', 'integer', 11, array(
            'primary'  => true,
            'unsigned' => true,
            'notnull'  => true,
         ));
        
        $this->hasColumn('title', 'string', 1000);
    }

    public function setUp(){
        
        $this->hasMany('Model_Answer', array(
            'local'    => 'eid',
            'foreign'  => 'examid',
            'onUpdate' => 'CASCADE',
            'onDelete' => 'RESTRICT',
        ));

  
        $this->hasMany('Model_ExamTranslation', array(
                'local'   => 'eid',
                'foreign' => 'etid',

        ));
        
        $this->actAs('I18n', array(
                            'fields'     => array('title'),
                            'className'  => 'Model_ExamTranslation',
        ));
        

    }
}

I have following Main Model at (APPLICATION_PATH/models/):


class Model_Exam extends Model_Base_Exam {
    public static function findAll(){
        return Doctrine_Query::CREATE()->from('Model_Exam e')->execute();
    }

    private function lastInsertId($model, $field){
        return $sql = Doctrine_Query::create()
                            ->select('MAX(e.'.$field.') as mid')
                            ->from($model.' e')
                            ->execute();
    }

    public static function getNewId($model, $field){
        $maxId  = self::lastInsertId($model, $field);
        return $maxId[0]->mid+1;
    }

    public static function addNewRecord($title){
        $exam = new Model_Exam();
        $examTranslation = new Model_ExamTranslation();

        echo $exam->eid    = self::getNewId('Model_Exam', 'eid'); echo '<br>';
        echo $examTranslation->etid = self::getNewId('Model_ExamTranslation', 'etid');
        
        $exam->save();
    }

}

I have following Main Base Translation Model at (APPLICATION_PATH/models/Base/):


class Model_Base_ExamTranslation extends Doctrine_Record {

        public function setTableDefinition(){
            $this->setTableName('exam_translation');

            $this->option('type', 'INNODB');
            $this->option('charset', 'utf8');
            $this->option('collate', 'utf8_general_ci');

            $this->hasColumn('etid', 'integer', 11, array(
                'primary'  => false,
                'unsigned' => true,
                'notnull'  => true,
                ));
            $this->hasColumn('lang', 'string', 2, array(
                'primary'  => false,
                'notnull'  => true,
                ));


            $this->hasColumn('title', 'string', 1000);

            $this->hasColumn('created', 'Timestamp');
            $this->hasColumn('updated', 'Timestamp');

        }

        public function setUp(){
            
            $this->actAs('Timestampable', array(
                                'created'  => array(
                                        'name'     => 'created',
                                    ),
                                 'updated' => array(
                                         'name'    =>  'updated'
                                 ),
            ));
        }
}

I have following Main Translation Model at (APPLICATION_PATH/models/):


class Model_ExamTranslation extends Model_Base_ExamTranslation {
    
}

Iam new to ZF and Doctrine, so unable to get Doctrine’s I18n running smoothly.
Iam unable to apply following lines in Doctrine’s manual. http://www.doctrine-project.org/projects/orm/1.2/docs/manual/behaviors/en#core-behaviors:i18n

Following are lines from manual, which are making me confused.


Now the first time you initialize a new NewsItem record Doctrine initializes the behavior that builds the followings things:
1. Record class called NewsItemTranslation
2. Bi-directional relations between NewsItemTranslation and NewsItem

Can some one guide me where Iam doing wrong and how it can be rectified.
Thanks in advance