🍸Automatic Invalidation

To speed up the scaffolding of invalidation within your app, you can specify the model to auto-flush the cache upon any time records gets created, updated, or deleted.

class Page extends Model
{
    use QueryCacheable;

    /**
     * Invalidate the cache automatically
     * upon update in the database.
     *
     * @var bool
     */
    protected static $flushCacheOnUpdate = true;
}

When you set up the $flushCacheOnUpdate property, the package attaches an observer to your model and any created, updated, deleted, forceDeleted or restored event will trigger the cache invalidation.

In order to make auto-flush work, you will need at least one base tag. Out-of-the-box, the model has a base tag set. In some cases, if you have overwritten the `getCacheBaseTags()` with an empty array, it might not work.

Selective cache invalidation

In some cases, you might not want to invalidate the whole cache of a specific model. Perhaps you got two queries that run individually and want to invalidate the cache only for them and not for all the models.

To do this, overwrite your getCacheTagsToInvalidateOnUpdate() method in your model:

class Page extends Model
{
    use QueryCacheable;

    /**
     * Specify the amount of time to cache queries.
     * Do not specify or set it to null to disable caching.
     *
     * @var int|\DateTime
     */
    public $cacheFor = 3600;

    /**
     * Invalidate the cache automatically
     * upon update in the database.
     *
     * @var bool
     */
    protected static $flushCacheOnUpdate = true;

    /**
     * When invalidating automatically on update, you can specify
     * which tags to invalidate.
     *
     * @return array
     */
    public function getCacheTagsToInvalidateOnUpdate(): array
    {
        return [
            "page:{$this->id}",
            'pages',
        ];
    }
}

The idea behind this configuration is that we can bind page:[some_id] tag (where some_id is a given ID from the input) to the queries where we try to get the page by ID and attach thepages tag to the queries where we get all the pages.

// i.e. $pageId is the ID from the router

$pages = Page::cacheTags(['pages'])->get();

$page = Page::cacheTags(["page:{$pageId}"])->first();

When the page model gets changed, it will invalidate the query in which we retrieve the page and the one that lists the page, thus invalidating exactly the two queries.

$page = Page::find($pageId);

$page->update([
    'name' => 'Getting Started',
]);

Please keep in mind: Setting $flushCacheOnUpdate to true and not specifying individual tags to invalidate will lead to a global flush for that model since the default tags to invalidate are the base tags and you need at least one tag to invalidate.

Not specifying a tag to invalidate fallbacks to the set of base tags, thus leading to Full Automatic Invalidation.