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.claude/skills/laravel-best-practices/rules/caching.md

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+# Caching Best Practices
+
+## Use `Cache::remember()` Instead of Manual Get/Put
+
+Atomic pattern prevents race conditions and removes boilerplate.
+
+Incorrect:
+```php
+$val = Cache::get('stats');
+if (! $val) {
+    $val = $this->computeStats();
+    Cache::put('stats', $val, 60);
+}
+```
+
+Correct:
+```php
+$val = Cache::remember('stats', 60, fn () => $this->computeStats());
+```
+
+## Use `Cache::flexible()` for Stale-While-Revalidate
+
+On high-traffic keys, one user always gets a slow response when the cache expires. `flexible()` serves slightly stale data while refreshing in the background.
+
+Incorrect: `Cache::remember('users', 300, fn () => User::all());`
+
+Correct: `Cache::flexible('users', [300, 600], fn () => User::all());` — fresh for 5 min, stale-but-served up to 10 min, refreshes via deferred function.
+
+## Use `Cache::memo()` to Avoid Redundant Hits Within a Request
+
+If the same cache key is read multiple times per request (e.g., a service called from multiple places), `memo()` stores the resolved value in memory.
+
+`Cache::memo()->get('settings');` — 5 calls = 1 Redis round-trip instead of 5.
+
+## Use Cache Tags to Invalidate Related Groups
+
+Without tags, invalidating a group of entries requires tracking every key. Tags let you flush atomically. Only works with `redis`, `memcached`, `dynamodb` — not `file` or `database`.
+
+```php
+Cache::tags(['user-1'])->flush();
+```
+
+## Use `Cache::add()` for Atomic Conditional Writes
+
+`add()` only writes if the key does not exist — atomic, no race condition between checking and writing.
+
+Incorrect: `if (! Cache::has('lock')) { Cache::put('lock', true, 10); }`
+
+Correct: `Cache::add('lock', true, 10);`
+
+## Use `once()` for Per-Request Memoization
+
+`once()` memoizes a function's return value for the lifetime of the object (or request for closures). Unlike `Cache::memo()`, it doesn't hit the cache store at all — pure in-memory.
+
+```php
+public function roles(): Collection
+{
+    return once(fn () => $this->loadRoles());
+}
+```
+
+Multiple calls return the cached result without re-executing. Use `once()` for expensive computations called multiple times per request. Use `Cache::memo()` when you also want cross-request caching.
+
+## Configure Failover Cache Stores in Production
+
+If Redis goes down, the app falls back to a secondary store automatically.
+
+```php
+'failover' => ['driver' => 'failover', 'stores' => ['redis', 'database']],
+```