How to use Redis cache in Laravel? - php

Question

It's my first time to use Laravel and Redis. I understand how to get, set, etc of Redis on Terminal. But no idea how to apply Redis on Laravel application.
I have application that saves participant's information in DB with MVC pattern. and I'd like to change it to use Redis cache to make it faster(and for practice). What do I have to do? Could you explain it with code?
This is ParticipantController. 'edit' function send user to edit page, and user edit the information and push 'save', it activate 'update' function. store/updateUserInput functions are just saving data to DB nothing else.
/**
* Show the form for editing the specified participant.
*
* #param int $id
* #return View
*/
public function edit(int $id): View
{
$participant = Participant::find($id);
if(empty($participant)){
return view('errors.404');
}
return view('participants.edit', ['participant'=>$participant]);
}
/**
* Update the specified participant in storage.
*
* #param ParticipantValidation $request
* #return RedirectResponse
*/
public function update(ParticipantValidation $request): RedirectResponse
{
$participant = Participant::find($request->id);
if(empty($participant)){
return view('errors.404');
}
$detail = $request->all();
Participant::updateUserInput($detail);
return redirect()->route('participants.create', $detail['event_id'])->with('success', 'Updated!');
}
+plus I tried this code on top of 'Controller' to use sth like $redis->set('message', 'Hello world'); but there's error that they cannot find 'Predis/Autoload.php'
require 'Predis/Autoload.php';
PredisAutoloader::register();
try {
$redis = new PredisClient();
}
catch (Exception $e) {
die($e->getMessage());
}

Answer 1

You can use the Cache facade
In your .env file, you must add CACHE_DRIVER=redis
Then whenever you want to get an instance of Participant:
$participant = null;
$key ="Participant".$id;
if(Cache::has($key)//get participant from cache
$participant = Cache::get($key);
else{//get participant and cache for 3 minutes
$participant = Participant::find($id);
$seconds = 180;
Cache::set($key, $participant, $seconds);
}