Codeigniter中where子句中的列“ id”不明确

Question

I want to join two tables in codeigniter. I want to display data according to login user.I do it getting session id of user.it display error message which I mention on heading.when i comment " $this->db->where("id",$this->session->userdata['logged_in']['id']);" this part it will work fine.

model

function get_user(){

    $this->db->select("user.firstname,user.lastname,user.address, user.email, user.contact_no, project.location"); 
    $this->db->where("id",$this->session->userdata['logged_in']['id']); //check login user
    $this->db->from('user');
     $this->db->join('project', 'project.client_id = user.id');
    $query = $this->db->get();
    return $query->result();

controller

public function index(){  

 $data['post'] = $this->profile_model->get_user(); // calling Post model method getPosts() 
        $this->load->view('user_include/header');
        $this->load->view('user_site/profile',$data);
    }

view

<?php if($post) { ?> 
<?php foreach($post as $post){?> 

    <div><?php echo $post->firstname ; echo '&nbsp; &nbsp;'; echo $post->lastname;?></div> <br>
    <div><?php echo $post->address ; echo '&nbsp; &nbsp; &nbsp;  &nbsp;&nbsp; &nbsp; &nbsp;  &nbsp;'?></div><br>
    <div><?php echo $post->contact_no ; echo '&nbsp; &nbsp; &nbsp;  &nbsp;&nbsp; &nbsp; &nbsp;  &nbsp;'?></div> <br>
    <div><?php echo $post->email ; echo '&nbsp; &nbsp; &nbsp;  &nbsp;&nbsp; &nbsp; &nbsp;  &nbsp;'?></div> <br>
    <div><?php echo $post->location ; echo '&nbsp; &nbsp; &nbsp;  &nbsp;&nbsp; &nbsp; &nbsp;  &nbsp;'?></div> <br>

<?php } 
} else {

    ?> 
 </div>
<div clospan="4" align="center">No records found to display</div>

Answer 1

Column is ambiguous for database. Try changing the where clause like this:

    $this->db->where("user.id",$this->session->userdata['logged_in']['id']);

or

$this->db->where("project.id",$this->session->userdata['logged_in']['id']);

if that's the case. Since both tables may have an id column, you must be very clear which one you refer to.