Codeigniter - 如何设置从数据库填充数据的选定选项的值

Question

I know maybe my question is very familiar, but i am a newbie in Codeigniter. I have been already implement a solution through searching in Stackoverflow, but the problem it's still persists. So i decided to ask again this question, through this forum.

I am trying to insert a data into a PostgreSQL table, but the error tells me that i have a null value in my query. I see thats the value that comes from option is not has any value.

This is my code.

Model

<?php
    class M_Item extends CI_Model{
        public function show_data(){
            return $this->db->get('tb_item');
        }

        public function add_item($data){
            $this->db->insert('tb_item', $data);
        }

        public function delete_item($where){
            $this->db->delete('tb_item', $where);
        }

        public function edit_item($where, $table){
            return $this->db->get_where($table,$where);
        }

        public function update_item($where, $data, $table){
            $this->db->where($where);
            $this->db->update($table, $data);
        }

        public function getAllItemName(){
            $query = $this->db->query('select item_name from tb_item;');
            return $query->result();
        }
    }
?>

Controller

<?php
    class Purchase extends CI_Controller{

        public function __construct()
        {
            parent::__construct();
            $this->load->model(['m_purchase','m_inventory','m_item','m_grid','m_vendor']);
            $this->load->helper(['string','form']);
        }

        // Show index
        public function index(){
            $data['purchase'] = $this->m_purchase->show_data()->result();

            $this->load->view('templates/header');
            $this->load->view('templates/sidebar');
            $this->load->view('pages/transaksi/v_purchase', $data);
            $this->load->view('templates/footer');
        }

        // Show form for input vendor
        public function form_create(){
            $item = $this->m_item->getAllItemName();
            $grid = $this->m_grid->getAllGridName();
            $vendor = $this->m_vendor->getAllVendorName();

            $data = array(
                'item' => $item,
                'grid' => $grid,
                'vendor' => $vendor
            );

            $this->load->view('templates/header');
            $this->load->view('templates/sidebar');
            $this->load->view('pages/transaksi/v_purchase_create', $data);
            $this->load->view('templates/footer');
        }

//method add vendor
        public function add(){

            $purchase_item = new stdClass();
            date_default_timezone_set('Asia/Jakarta');
            $now = date('Y-m-d H:i:s');

            // User as dummy
            $userId = 1;


            $purchase_number = $this->input->post('purchase_id');
            $purchase_item = $this->input->post('item_id');
            $quantity = $this->input->post('quantity');
            $grid = $this->input->post('grid_id');
            $vendor = $this->input->post('vendor_id');

            $data = array(
                'purchase_id' => $purchase_number,
                'purchase_time' => $now,
                'item_id' => $purchase_item,
                'quantity' => (int)$quantity,
                'grid_id' => $grid,
                'vendor_id' => $vendor,
                'user_id' => $userId
            );

            $dataStock = array(
                'item_id' => $purchase_item,
                'grid_id' => $grid,
                'stock' => $quantity,
                'last_update' => $now
            );

            $this->db->trans_start();
            $this->m_purchase->add_purchase($data, 'tb_purchase');
            $this->m_inventory->updateStock($dataStock, 'tb_inventory');
            $this->db->trans_complete();
            if ($this->db->trans_status() === FALSE) {
                throw 
                $message = "Gagal Simpan data";
                echo "<script type='text/javascript'>alert('$message');</script>";
            } else {
                $success = "Sukses Simpan Data";
                echo "<script type='text/javascript'>alert('$success');</script>";
                redirect('pages/transaksi/purchase/index');
            }


        }

    //Another Code hiding

View

<div class="col-sm-6">
    <label for="">Purchase Item</label>
   <select name="item_id" id="item_id" class="form-control">
   <?php foreach ($item as $i) :{
    echo "<option value='".$i->item_id."'>".$i->item_name."</option>";
   }
   endforeach; ?>
   </select>
</div>

Error Result

ERROR: invalid input syntax for integer: "" LINE 1: ... VALUES ('PURCHASEOMS101', '2020-01-05 16:12:04', '', 100, '... ^

INSERT INTO "tb_purchase" ("purchase_id", "purchase_time", "item_id", "quantity", "grid_id", "vendor_id", "user_id") VALUES ('PURCHASEOMS101', '2020-01-05 16:12:04', '', 100, '', '', 1)

I was expected that the query has inserting some data to the table. Any help would be appreciated.

Answer 1

Finally, after some searching and implementation, i found a solution for this case, i made a change on 2 file, the controller and the view

Purchase Controller

// Show form for input purchase
        public function form_create(){  
            $data['item'] = $this->m_item->show_data()->result();
            $data['grid'] = $this->m_grid->show_data()->result();
            $data['vendor'] = $this->m_vendor->show_data()->result();

            $this->load->view('templates/header');
            $this->load->view('templates/sidebar');
            $this->load->view('pages/transaksi/v_purchase_create', $data);
            $this->load->view('templates/footer');
        }

        //method add vendor
        public function add(){
            date_default_timezone_set('Asia/Jakarta');
            $now = date('Y-m-d H:i:s');
            // User as dummy
            $userId = 1;

            $purchase_number = $this->input->post('purchase_id');
            $purchase_item = $this->input->post('purchase_item');
            $quantity = $this->input->post('quantity');
            $grid = $this->input->post('grid_id');
            $vendor = $this->input->post('vendor_id');

            $data = array(
                'purchase_id' => $purchase_number,
                'purchase_time' => $now,
                'item_id' => (int) $purchase_item,
                'quantity' => (int) $quantity,
                'grid_id' => (int) $grid,
                'vendor_id' => (int) $vendor,
                'user_id' => $userId
            );

            $dataStock = array(
                'item_id' => $purchase_item,
                'grid_id' => $grid,
                'stock' => $quantity,
                'last_update' => $now
            );

            $this->db->trans_start();
            $this->m_purchase->add_purchase($data, 'tb_purchase');
            $this->m_inventory->updateStock($dataStock, 'tb_inventory');
            $this->db->trans_complete();
            if ($this->db->trans_status() === FALSE) {
                throw 
                $message = "Gagal Simpan data";
                echo "<script type='text/javascript'>alert('$message');</script>";
            } else {
                $success = "Sukses Simpan Data";
                echo "<script type='text/javascript'>alert('$success');</script>";
                redirect('pages/transaksi/purchase/index');
            }


        }

//another code hiding

V_Purchase_Create

<div class="col-sm-6">
    <label for="">Purchase Item</label>
      <select name="purchase_item" id="item_id" class="form-control">
        <?php foreach($item as $row):?>
          <option value="<?php echo $row->item_id;?>"><?php echo $row->item_name;?> 
          </option>
        <?php endforeach;?>
      </select>
</div>

So maybe this is not the best practice, (maybe you can do something like this with AJAX) but i think it's oke, thanks to @mikeyhun for answering my question, happy coding!!