codeigniter datatables join query not working - sql

Question

//i am using datables in CI but not running properly . please look at the join query and suggests how i can last join condition .
private function _get_datatables_query($term='')
{
$user_id = $this->session->userdata("user_id");
$user_type = $this->session->userdata("user_type");
$column = array('A.type','C.school_name','A.mobile','A.email','A.birthdate','A.anniversary','A.gender','A.firstname','A.lastname');
$this->db->select('A.type,C.school_name,A.mobile,A.email,A.birthdate,A.anniversary,A.gender,A.firstname,A.lastname,C.s2m_admin_id,A.status,A.id,A.pusername');
$this->db->from('users as A');
$this->db->join('school_user as B', 'B.user_id = A.id');
$this->db->join('school as C', 'C.id = B.school_id');
$this->db->join('school as D', 'D.s2m_admin_id = A.id');//<= i am having problem in this line else is working properly .if i add this line query return nothing.
$this->db->having('A.status','active');
$this->db->like('A.type', $term);
$this->db->or_like('A.mobile', $term);
$this->db->or_like('A.firstname', $term);

Answer 1

Try this
$user_id = $this->session->userdata("user_id");
$user_type = $this->session->userdata("user_type");
//$column = array('U.type','S.school_name','U.mobile','U.email','U.birthdate','U.anniversary','U.gender','U.firstname','U.lastname');
$this->db->select(*);
$this->db->from('users as U');
$this->db->join('school_user as SU', 'SU.user_id = U.id');
# added where clause
$this->db->where('school.id = SU.school_id OR school.s2m_admin_id = U.id');
$this->db->having('U.status','active');
$this->db->like('U.type', $term);
$this->db->or_like('U.mobile', $term);
$this->db->or_like('U.firstname', $term);