Validating insert codeigniter - php

Question

I'm trying to validating my insert data in codeigniter
The problem is the code returning me a duplicate entry's page error. And i want to throw that failure to home page with error message.
Here is my code:
$data = array(
'heheId' => $this->input->post('heheId'),
'userId' => $this->input->post('userId')
);
$this->db->insert('tentarasaya',$data);
if ($this->db->affected_rows() > 0){
$this->session->set_flashdata('info', "Hore sukses");
} else {
$this->session->set_flashdata('danger', "Fail insert");
}
redirect('my_home');
Any answer?
Update:
Duplicate entry like this

Answer 1

Try this
$data = array(
'heheId' => $this->input->post('heheId'),
'userId' => $this->input->post('userId')
);
if (!$this->db->insert('tentarasaya',$data)) { # add if here
# Unsuccessful
$this->session->set_flashdata('danger', "Fail insert");
}
else{
# Success
$this->session->set_flashdata('info', "Hore sukses");
}
redirect('my_home');

Answer 2

make sure that auto increment option is selected in your database. I am assuming that user_id here is a primary key, no need to insert that into a database yourself.
data = array(
'heheId' => $this->input->post('heheId'),
);
$this->db->insert('tentarasaya',$data);
Otherwise if you wish to insert user_ids yourself you can 1) define a custom call back function to check to see if the specified user id already exists in the database, 2) use the is_unique form validation rule that comes bundled with codeigniter