错误：您必须使用“set”方法更新条目

Question

I am using Codeigniter as my PHP framework, and I keep getting this error when I submit my data to my database.

I am already using set in the controller. I am not sure why I have this error:

You must use the “set” method to update an entry

My model:

public function update_reserve($data,$book_id)
{    
    $this->db->where('book_id',$book_id);
    $this->db->update('books',$data);
    return TRUE;
}

My controller:

public function out()
{  
    $book_id = $this->input->post('book_id');
    if(isset($_POST['btn_reserve'])) {
       $data = array(  
       'pickup' =>$this->input->post('pickup'),
       'return' =>$this->input->post('return'),);
        if(!empty($data)) {
            $this->user_model->update_reserve($book_id,$data);
        }
    }  
}

Answer 1

In model, You can use "set" method:

public function update_reserve($data,$book_id)
{    
    $this->db->where('book_id',$book_id);
    $this->db->set($data);
    $this->db->update('books');
    return TRUE;
}

Answer 2

I think you should call your method like this

$this->user_model->update_reserve($data,$book_id); 

to see result