CodeIgniter 3 upload image just reloading the page - codeigniter

Question

I am trying to make an upload form but when I submit it, it just refreshes the form, does not even go back to the designated route and no message is shown. Here is my add() function:
public function add()
{
if ($this->input->post()) {
$data['upload_path'] = './uploads/';
$data['allowed_types'] = 'jpg|png|gif';
$data['max_size'] = '500';
$data['max_width'] = '1024';
$data['max_height'] = '768';
$this->load->library('upload', $data);
if ($this->upload->do_upload('imagem')) {
$image_data = $this->upload->data();
$this->session->set_flashdata('message', 'Imagem \'' . $image_data['file_name'] . '\' adicionada');
} else {
$this->session->set_flashdata('message', 'Erro: ' . $this->upload->display_errors());
}
redirect('/admin/banners', 'refresh');
}
$data['page'] = $this->config->item('admin_template_dir_admin') . '/banners/add';
$data['module'] = 'admin';
$this->load->view($this->_container, $data);
}
The form:
<form action="/admin/banners/adicionar" method="POST" enctype="multipart/form-data">
<div class="form-group">
<small>Imagens de até 1024x768</small>
</div>
<div class="form-group">
<label for="selecionar_imagem">Selecionar Imagem</label>
<input type="file" name="imagem" required/>
</div>
<hr/>
<div class="form-group">
<button class="btn btn-primary pull-right">Adicionar</button>
</div>
</form>
Am I missing something?

Answer 1

I made it. It seems I did have to modify the way I was doing the things. I had to create a separated method upload(), instead of doing that if condition inside of the same method I was rendering the view.
public function add()
{
$data['page'] = $this->config->item('admin_template_dir_admin') . '/banners/add';
$data['module'] = 'admin';
$this->load->view($this->_container, $data);
}
public function upload()
{
$this->load->library('upload', array(
'upload_path' => './uploads/',
'allowed_types' => 'jpg',
'max_size' => '5000',
'overwrite' => true
));
if ($this->upload->do_upload('imagem')) {
$this->session->set_flashdata('message', 'Imagem de Banner adicionada');
} else {
$this->session->set_flashdata('message', 'Erro: ' . $this->upload->display_errors());
}
redirect('/admin/banners', 'refresh');
}
And then in the form, modify the method to /admin/banners/upload.