codeigniter join same table multiple values

Question

i need some codeigniter 3 help from you friends. its like 10 years ago when i did some more complex querys and my noobish JOIN-trys just gave me errors and questionmarks for hours.

lets say i have a mysql table covers

id, text, bgcolor_id, color_id
example : 1, "nice headline", 55, 88

and a table colors

id, value, name
example : 55, #FF0000, "red"
example : 88, #000000, "black"

how to "link" based on bgcolor_id, color_id in table covers

cover.bgcolor_id -> 
color.value AS bgcolorvalue
color.name AS bgcolorname

cover.color_id ->
color.value AS colorvalue
color.name AS colorname

my codeigniter model

public function list(){
$query = $this->db->query('SELECT * FROM covers ORDER BY id DESC');
return $query->result_array();
}

public function get($id){
$query = $this->db->query('SELECT * FROM covers WHERE id = ' . $id);
return $query->row();
}

Answer 1

Join twice your colors table

select c.*,c1.name bgcolorname,
c1.value bgcolorvalue,
c2.name colorname, 
c2.value colorvalue
from covers c
join colors c1 on c.bgcolor_id = c1.id
join colors c2 on c.color_id = c2.id

DEMO

Answer 2

I strongly recommend you to use the query builder Reference

You could to something like.

$cv = 'covers';
        $cl1 = 'colors';
        $cl2 = 'colors';
        $get = array(
            $cv.'.id',
            $cv.'.text',
            $cv.'.bgcolor_id',
            $cv.'.color_id',
            $cl1.'.value as bgcolorvalue',
            $cl1.'.name as bgcolorname',
            $cl1.'.value as colorvalue',
            $cl1.'.name as colorname'
        );
        $this->db->select($get);
        $this->db->from($cv);
        $this->db->where($cv.'.id', 1);
        $this->db->join($cl1, $cv.'.bgcolor_id = ' . $cl1.'.id');
        $this->db->join($cl2, $cv.'.color_id = ' . $cl2.'.id');
        $result = $this->db->get()->result();

let me know if this works

Answer 3

As i have understood your question right then you want to join on colors table twice for bgcolor_id and color_id , so here i am providing solution for your question let me know if it works or something wrong with the solutuion, thanks.

 public function list(){
     $query = $this->db->select("covers.*, bg.value AS bgcolorvalue bg.name AS 
                            bgcolorname, colors.value AS colorvalue
                            colors.name AS colorname")
                 ->join("colors", "colors.id = covers.color_id", "left")
                 ->join("colors as bg", "bg.id = covers.bgcolor_id", "left")
                 ->get("covers")->result(); 
     return $query->result_array();
 }