Codeigniter update form - php

Question

I'm really new to CI and have been trying to create an update form class today, but I'm running into a dead end. I have my functions set up to create the form and publish the data to the database, I now need to be able to update this.
My edit form function is below:
public function edit_event()
{
$vars = array();
$data['form_url'] = $this->form_url;
if ($form_id = $this->EE->input->get('form_id'))
{
$data['form_id'] = $form_id;
}
return $this->EE->load->view('edit_event', $data, TRUE);
}
and the edit_event file loaded within the function is:
<?php
$this->EE=& get_instance();
$this->load->helper('form');
$attributes = array('class' => 'event_form', 'id' => 'my_event_form');
echo form_open($form_url.AMP.'method=update_form', $attributes);
$this->EE->load->library('table');
$this->EE->table->set_heading(
'Preference',
'Setting'
);
$query = $this->EE->db->query("SELECT * FROM exp_events WHERE id = '$form_id'");
foreach($query->result_array() as $row)
{
$this->EE->table->add_row(
form_label('Application Key', 'app_key'),
form_input('app_key',$row['app_key'])
);
$this->EE->table->add_row(
form_label('Access Token', 'access_token'),
form_input('access_token',$row['access_token'])
);
$this->EE->table->add_row(
form_label('User Key', 'user_key'),
form_input('user_key',$row['user_key'])
);
}
echo $this->EE->table->generate();
echo form_reset('reset', 'Clear Form');
echo form_submit('mysubmit', 'Submit Post!');
echo form_close();
?>
I then have my update form function:
public function update_form()
{
$form_id = $this->EE->input->get('form_id');
$data['form_id'] = $form_id;
$form_data = array(
'app_key' => $this->EE->input->post('app_key'),
'access_token' => $this->EE->input->post('access_token'),
'user_key' => $this->EE->input->post('user_key')
);
$this->EE->db->where('id', $form_id);
$this->EE->db->update('exp_events', $form_data);
$this->EE->functions->redirect($this->base_url);
}
When removing the $form_if option I can get the data to update, but it updates for every single item in the database. I obviously need this to only update the data with the form id of the form being edited.
As it stands, when I submit the update form, I get redirected to my $base_url which is correct, but no data gets updated, therefore I am clearly doing something wrong when defining the form id?
As I said I'm new to this, so if anyone notices any preferred methods feel free to let me know :).
Any pointers appreciated.
Thanks in advance.
Ben

Answer 1

You need to include a 'hidden' field in your form, with the form_id. At the moment your 'form_id' is not part of your input, so when you go and get the form_id it is failing.
change
echo $this->EE->table->generate();
echo form_reset('reset', 'Clear Form');
echo form_submit('mysubmit', 'Submit Post!');
to
echo $this->EE->table->generate();
echo form_hidden('form_id', $form_id);
echo form_reset('reset', 'Clear Form');
echo form_submit('mysubmit', 'Submit Post!');