codeigniter download from database

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database

CodeIgniter

I make a download function to download pdf based on filename that has already inserted on database and this is my function:

function download($offset=0,$order_column='judul',$order_type='asc'){
        $this->load->helper('download');
        if(empty($offset)) $offset=0;
        if(empty($order_column)) $order_column='judul';
        if(empty($order_type)) $order_type='asc';
        
        //load data
        $data=$this->m_ebook->semua($this->limit,$offset,$order_column,$order_type)->result();
        
        
        
        $config['total_rows']=$this->m_ebook->jumlah();
        $config['per_page']=$this->limit;
        $config['uri_segment']=3;
        $this->pagination->initialize($config);
        $data['pagination']=$this->pagination->create_links();        
        foreach ($data as $row)
        {            
            $data=file_get_contents("./assets/files/".$row->file);
            $name = 'download.pdf';

            force_download($name,$data);
        }
        
    }

these are my models:

function semua($limit=10,$offset=0,$order_column='',$order_type='asc'){
        // $db1 = $this->load->database('default',TRUE);
        
        if(empty($order_column) || empty($order_type))
            $this->db->order_by($this->primary,'asc');
        else
            $this->db->order_by($order_column,$order_type);
        return $this->db->get($this->table,$limit,$offset);
    }

function jumlah(){
        return $this->db->count_all($this->table);
    }

the problem is the file that I downloaded is always the first pdf name from database
can you help me fix my code?