php – New to CodeIgniter and I don't know how to edit db-ThrowExceptions

So I’m trying to learn how to use CI and the person who wants me to learn it said its easier to use it without a model just with controlers and views. I’m trying to edit a row from my DB . Here is my controler code

public function index() {
    $alimente = $this->db->query('select alimente.id, alimente.name FROM alimente order by name asc')->result();
    $totalQuery = $this->db->query("select count(id) as total from alimente")->result();

    $nrcrt = 1;
    foreach ($alimente as $a) {
        $a->nrcrt = $nrcrt++;
    }
    $content = $this->parser->parse('alimente/list_alimente', array("ALIMENTE" => $alimente, "COUNT" => $totalQuery), true);
    $TITLE = " Lista Alimente";
    $array = array('TITLE' => $TITLE, 'CONTENT' => $content);
    $this->parser->parse('TEST', $array, false);

}

public function add() {
    $add_aliment = $this->parser->parse('alimente/add_aliment', array(), true);
    $TITLE = "Adauga alimente";
    $array = array('TITLE' => $TITLE, 'CONTENT' => $add_aliment);
    $this->parser->parse('TEST', $array, false);
}

public function add_done() {
    $name = $this->input->post('name');
    $data = array(
        'name' => $name,
    );

    $this->db->insert('alimente', $data);

    redirect("alimente");
}

public function edit($id) {
    $alimente = $this->db->query('select alimente.id, alimente.name FROM alimente  WHERE id = "' . $id . '" order by name desc')->result();
    $content = $this->parser->parse('alimente/edit_alimente', array("ALIMENTE" => $alimente), true);
    $TITLE = "Modifica";
    $array = array('TITLE' => $TITLE, 'CONTENT' => $content);
    $this->parser->parse('TEST', $array, false);
}

public function edit_done() {
    $name  = $this->imput->post("name");
    $id  = $this->imput->post("id");

    $query = $this->db->prepare("update alimente set name = '".$name."' where id = '".$id."'")->result();
    $query->execute($name, $id);

    redirect("alimente");
}

And here is my views file

<main role="main" class="col-md-9 ml-sm-auto col-lg-10 px-4">
<div class="d-flex justify-content-between flex-wrap flex-md-nowrap align-items-center pt-3 pb-2 mb-3 border-bottom">
    <h1 class="h2">Modifica alimente</h1>
</div>

<form method="post" action="{SITE_URL}/alimente/edit_done">

    <div class="form-group">

        {ALIMENTE}    
        <label> Id aliment</label>
        <input type="text" name="id" value= " {id} " class="form-control" />
        <label> Nume aliment</label>
        <input type="text" name="name" value= " {name} " class="form-control" />
        <br>
        {/ALIMENTE}
    </div>

    <input type="submit" value="Modifica" name="name" class="btn btn-primary" />

</form>

Any help would be great, and I’m sorry if the code is horrible, I just started learning programing for 3 months

EDIT : I forgot to put the error I’m getting

A PHP Error was encountered Severity: Notice

Message: Undefined property: Alimente::$imput

Filename: controllers/Alimente.php

Line Number: 49

Backtrace:

File: C:\xampp\htdocs\CodeIgnite\application\controllers\Alimente.php
Line: 49 Function: _error_handler

File: C:\xampp\htdocs\CodeIgnite\index.php Line: 315 Function:
require_once

An uncaught Exception was encountered Type: Error

Message: Call to a member function post() on null

Filename:
C:\xampp\htdocs\CodeIgnite\application\controllers\Alimente.php

Line Number: 49

Backtrace:

File: C:\xampp\htdocs\CodeIgnite\index.php Line: 315 Function:
require_once

Answer：

public function edit_done() {
$name  = $this->input->post("name");
$id  = $this->input->post("id");

$query = $this->db->prepare("update alimente set name = '".$name."' where id = '".$id."'")->result();
$query->execute($name, $id);

redirect("alimente");