php CI $this->cart->insert($data) get null value - php

Question

I get stack in script. I used Code Igniter ver. 3.1.10. I use cart library in my controller
here my controller
public function add_to_cart()
{
$idit=$this->input->post('id_item');
$product=$this->Salesmodel->get_item($idit);
$i=$product->row_array();
$data = array(
'id' => $i['id_item'],
'name' => $i['name_item'],
'main_price' => $i['main_price'],
'sell_price' => $i['sell_price'],
);
$this->cart->insert($data);
$rows = count($this->cart->contents()); // I want to find out rows count and result is null
echo $i['id_item']; //get value, not null
echo $rows; // get '0'
}
model.php
function get_item($idit)
{
$rslt=$this->db->query("SELECT * FROM tb_item where id_item='$idit'");
return $rslt;
}
but in that script i always get null row count of the cart.
I have to add this script in config.php :
$config['sess_use_database'] = TRUE;
I also created a new table with a name
ci_session
but that returns the same result, my cart always has null row count and null data. Please help me with an error in the script that I made.
Thanks in advance

Answer 1

In order to save into the cart properly, these 4 array index are required :
id - Item identifier.
qty - Item quantity.
price - Item price.
name - Item name.
And the 5th index are options, which you could store all the additional attribute you need (should be an array though).
So you could modify the $data array like this :
$data = array(
'id' => $i['id_item'],
'qty' => 1, // here I just manually set it to 1
'name' => $i['name_item'],
'price' => $i['main_price'], // here I changed 'main_price' index to 'price'
'options' => array('sell_price' => $i['sell_price']) // moved the 'sell_price' array here
);