Cache Eloquent queries in Laravel 6

The package can be found on GitHub, where the documentation will approach all of the main points of the app. However, during this article, you’ll learn just the basics of caching and clearing cache so you can get started before you will dig deeper.

Installation

The package can be installed through Composer:

$ composer require rennokki/laravel-eloquent-query-cache

Your models will need the QueryCacheable trait:

use Rennokki\QueryCache\Traits\QueryCacheable;class Article extends Model
{
 use QueryCacheable; ...
}

Enable the caching behavior by default

By default, the package does not enable query caching. To achieve this, add the $cacheFor variable in your model:

use Rennokki\QueryCache\Traits\QueryCacheable;class Article extends Model
{
 use QueryCacheable; protected $cacheFor = 180; // 3 minutes
}

Whenever a query will be triggered, the cache will intervene and in case the cache is empty for that query, it will store it and next time will retrieve it from the caching database; in case it exists, it will retrieve it and serve it, without hitting the database.

// database hit; the query result was stored in the cache
Article::latest()->get();// database was not hit; the query result was retrieved from the cache
Article::latest()->get();

If you simply want to avoid hitting the cache, you can use the ->dontCache() before hitting the final method.

Article::latest()->dontCache()->firstOrFail();

Enable the caching behavior query-by-query

The alternative is to enable cache query-by-query if caching by default doesn’t sound like a good option to you.

First of all, remove the $cacheFor variable from your model.

On each query, you can call ->cacheFor(...) to specify that you want to cache that query.

Article::cacheFor(now()->addHours(24))->paginate(15);

Organize better with tags

Some cache storages, like Redis or Memcached, come up with the support of tagging your keys. This is useful because we can tag our queries in-cache and invalidate the needed cache whenever we want to.

As a simple example, this can be useful if we want to invalidate the articles list cache when one article gets updated.

$articles = Article::cacheFor(60)->cacheTags(['latest:articles'])->latest()->get();$article = Article::find($id);
$article->update(['title' => 'My new title']);Article::flushQueryCache(['latest:articles']);

The method flushQueryCache invalidates only the caches that were tagged with latest:articles. If some other queries would have been tagged with tags other than latest:articles, they would be kept in the cache.

Digging deeper

For more about this package, check out the project’s page on GitHub.