Multiple Joins using Codeigniter - mysql

Question

I have this query made in codeigniter using active record
$this->db->select('products_main.*, images_main.*, items_main.*, product_tags.*');
$this->db->from('products_main');
$this->db->join('images_main','products_main.product_tag = images_main.img_tag AND products_main.product_id = images_main.pro_img_id');
$this->db->join('items_main','products_main.product_id = items_main.pro_items_id');
$this->db->join('product_tags','products_main.product_id = product_tags.pro_tag_id');
$this->db->where('products_main.product_id',$p_id);
$this->db->where('products_main.status','active');
$this->db->group_by('products_main.product_id');
$query = $this->db->get();
My goal is to:
Grab one product from products_main that matches the input from $p_id
Grab all the photos for that one product from the images_main table
Grab all the items that have the product_id of the product I have found
Grab the row in the product_tags table that match the product_id of the product i have found.
I started a test fiddle here but have not filled out the query part yet as I do not know what to put. fiddle

Answer 1

You don't have any problem within your query, but as you group by product id, you may only get one result, but you can group by image_id instead, i've created the same in my localhost with the database you've created a fiddle and tried your solution, your only problem i see was as you don't join on left, the query can't find any exact matches, so try to join on left, also i've changed your query a little bit to prevent the database error with the given structure in your fiddle, so change it if you have them like that in your database ( commented them ) :
$this->db->select('p.*, im.*, i.*, pt.*');
$this->db->from('products_main as p');
// img_tag -> image_tag
$this->db->join('images_main as im',
'p.product_tag = im.image_tag
AND p.product_id = im.product_id','left'); // pro_img_id -> product_id
$this->db->join('items_main as i',
'p.product_id = i.product_id','left'); // pro_items_id -> product_id
$this->db->join('product_tags as pt',
'p.product_id = pt.product_id','left'); // pro_tag_id -> product_id
$this->db->where('p.product_id',"23"); // i have given example id as 23
$this->db->where('p.status','active');
$query = $this->db->get();
return $query->result_array();