I want to do something like this.
I have 3 tables:  utilisateur,groupe,usertogroupe :
CREATE TABLE IF NOT EXISTS `usertogroupe` 
(
  `idgroupe` bigint(8) NOT NULL,
  `idutilisateur` int(11) NOT NULL,
  `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `idusertogroupe` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`idusertogroupe`)
) 
CREATE TABLE IF NOT EXISTS `groupe` (
  `nomGroupe` varchar(30) COLLATE utf8_bin NOT NULL,
  `idGroupe` bigint(8) NOT NULL AUTO_INCREMENT,
  `idSection` bigint(20) NOT NULL,
  `idperiode` bigint(20) NOT NULL,
  PRIMARY KEY (`idGroupe`),
  KEY `idGroupe` (`idGroupe`)
)  
CREATE TABLE IF NOT EXISTS `utilisateur` (
  `pseudo` varchar(10) COLLATE utf8_bin NOT NULL,
  `pwd` varchar(30) COLLATE utf8_bin NOT NULL,
  `role` enum('Utilisateur','Administrateur','Support') COLLATE utf8_bin NOT NULL,
  `id_utilisateur` int(11) NOT NULL AUTO_INCREMENT,
  `cinpersonne` varchar(8) COLLATE utf8_bin NOT NULL DEFAULT '00000000',
  `actif` enum('oui','non') COLLATE utf8_bin NOT NULL,
  `email` varchar(30) COLLATE utf8_bin NOT NULL,
  `signature` varchar(30) COLLATE utf8_bin NOT NULL,
  `pwdEmail` varchar(30) COLLATE utf8_bin NOT NULL,
  PRIMARY KEY (`id_utilisateur`)
)  
utilisateur-> groupe is a n:n relationship
I am using set_relation_n_n to establish the relationship between the ‘utilisateur’ table and the groupe table. I created a form in which it contains a list. The list contain a list of groups that refers, filtered, by a ‘utilisateur’; the ‘utilisateur’ manage one or many groups. I tried to create a set_relation_n_n and filtered by the ‘utilisateur’. Unfortunately I’m unable to generate the needed list.
Would you help us to under pass this pb?
 $this->grocery_crud->set_table('utilisateur');
		 
		$this->grocery_crud->set_relation_n_n('Affectation','usertogroupe', 'groupe', 'idutilisateur', 'idgroupe','nomGroupe',null,array('idgroupe'=>28));// I have to change the idgroupe to idutilisateur		
		$this->grocery_crud->set_table('email');				
		$this->grocery_crud->columns('source','destination','sujet','contenu','Affectation');
		$this->grocery_crud->fields('source','destination','sujet','contenu' ,'Affectation');
			      	
		$this->grocery_crud->set_rules('contenu', 'contenu', 'trim|required|min_length[10]|max_length[280]|xss_clean');		 
		
		$this->grocery_crud->unset_texteditor('contenu','contenu');		
		$this->grocery_crud->unset_edit();
		$this->grocery_crud->callback_after_insert(array($this->grocery_crud, 'after_insert_email'));
 
        $output = $this->grocery_crud->render();
 
        $this->_example_output($output);   
Thanks in advance.

 
                                 
             
                                                                                            