Converting Array to String Codeigniter 3.0 - php

Question

I am trying to insert an element into my 'category' table and use the inserted element's id to insert another element into my 'subcategory' table.
This is my code in my controller
public function insertCategory(){
$category = $this->input->post('category');
$subcategory = $this->input->post('subcategory');
$this->form_validation->set_rules('category', 'Category', 'required');
$this->form_validation->set_rules('subcategory', 'Subcategory', 'required');
if($this->form_validation->run() == FALSE){
$this->load->view('ADMIN_ADDCategory');
}
else{
$category_id = $this->admin_model->insertCategory($category);
$this->admin_model->insertSubcategory($category_id, $subcategory);
}
}
And this is my code in my model
function insertCategory($category){
$data = array(
'category' => $category,
'status' => 1
);
$this->db->insert('category', $data);
$this->db->select('id');
$this->db->from('category');
$this->db->where('category', $category);
$this->db->limit(1);
$query = $this->db->get();
return $query->result();
}
function insertSubcategory($category_id, $subcategory){
$data = array(
'category_id' => $category_id,
'subcategory' => $subcategory,
'status' => 1
);
$this->db->insert('subcategory', $data);
}
However I am getting this error
I already tried using $category_id = (array) $this->admin_model->insertCategory($category); but it still doesn't work
How do I overcome this error? Thank you for the help.

Answer 1

$this->admin_model->insertSubcategory($category_id, $subcategory);
$category_id is an array , so , you must do it like this:
$this->admin_model->insertSubcategory($category_id[0]->field, $subcategory);

Answer 2

You should try this
$this->admin_model->insertSubcategory($category_id[0]->id;, $subcategory);

Answer 3

try this code
Model
public function insert($table, $data)
{
if($this->db->insert($table,array $data))
{
return $this->db->insert_id();
}else
return false
}
controller
public function insertCategory(){
$this->form_validation->set_rules('category', 'Category', 'required');
$this->form_validation->set_rules('subcategory', 'Subcategory', 'required');
if($this->form_validation->run() == FALSE){
$this->load->view('ADMIN_ADDCategory');
}
else{
$category = $this->input->post('category');
$subcategory = $this->input->post('subcategory');
//data must be an array
$data = [
'category' => $category,
'status' => '1'
];
$category_id = $this->admin_model->insert('tablename',$data)
if($category_id != false)
{
$data = [
'category_id' => $category_id,
'subcategory' => $subcategory,
'status' => 1
];
if($this->admin_model->insert('table name', $data) != false)
{
echo 'success';
//or load your success page
}else{
echo 'failed';
//or load your success page
}
}else{
echo 'failed';
//or load your success page
}
}
}