How to pass parameters to controllers in codeIgniter - php

Question

I have a database in mysql which has 2 tables one named category(cat_id primary key) and one named book(b_id as primary key) where cat_id is a foreign key for book.
I'm working in CI and here I output the categories in a view:
foreach($categories->result()as $row){
foreach($categories->result()as $row){
echo ''.$row->category.'<br>';
}
}
I want that when clicking to the link category_details to output just the books of that category.
Here I have this method in my controller:
public function category_details($data)
{
$data['cat_id'] = $this->home_model->output_cat_detail();
$data['category_detail'] = $this->home_model->output_cat_detail();//printon librat
$data['categories'] = $this->home_model->output_categories();
$this->load->view('header', $data);
$this->load->view('category_details', $data);
}
So the method in model which does that selection is this:
public function output_cat_detail(){
$condition = "cat_id =" . "'" . $data['cat_id'] . "'";
$this->db->select('*');
$this->db->from('book');
$this->db->where($condition);
$query = $this->db->get();
return $query;
But after I do this when I click in a category all the books appear not just the books of that category I have clicked. Can someone help me with the condition to select just the books of that category?

Answer 1

public function category_details($id){
$data = array();
$data['category_detail'] = "";
$query = $this->db->get_where('book', array('id' => $id));
// Your current model logic will not work for this
if($query->num_rows() > 0){
$data['category_detail'] = $query->result();
}
$this->load->view('header', $data);
$this->load->view('category_details', $data);
}