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src/Bootstrappers/DatabaseCacheBootstrapper.php

@@ -25,7 +25,10 @@ use Stancl\Tenancy\TenancyServiceProvider;
  *
  * Notably, this bootstrapper sets TenancyServiceProvider::$adjustCacheManagerUsing to a callback
  * that ensures all affected stores still use the central connection when accessed via global cache
- * (typicaly the GlobalCache facade or global_cache() helper).
+ * (typically the GlobalCache facade or global_cache() helper), even though this bootstrapper explicitly
+ * sets the connection to tenant for all scoped cache stores. TenancyServiceProvider::makeDatabaseCacheStoresCentral()
+ * cannot fix globalCache on its own because it reads 'tenant' from config (set by this bootstrapper), not null,
+ * so the callback is still needed to correct the connection to central for globalCache.
  */
 class DatabaseCacheBootstrapper implements TenancyBootstrapper
 {

src/TenancyServiceProvider.php

@@ -88,23 +88,26 @@ class TenancyServiceProvider extends ServiceProvider
             // This works great for cache stores that are *directly* scoped, like Redis or
             // any other tagged or prefixed stores, but it doesn't work for the database driver.
             //
-            // When we use the DatabaseTenancyBootstrapper, it changes the default connection,
-            // and therefore the connection of the database store that will be created when
-            // this new CacheManager is instantiated again.
+            // When DatabaseTenancyBootstrapper is used, it changes the default DB connection
+            // to 'tenant'. A freshly created CacheManager would therefore instantiate database
+            // stores with the tenant connection.
             //
-            // For that reason, we also adjust the relevant stores on this new CacheManager
-            // using the callback below. It is set by DatabaseCacheBootstrapper.
+            // For that reason, we adjust the relevant stores on this new CacheManager
+            // using the makeDatabaseCacheStoresCentral() method and the $adjustCacheManagerUsing callback below
+            // (set by DatabaseCacheBootstrapper).
             $manager = new CacheManager($app);
 
-            // Make globalCache use either the configured non-null connection,
-            // or fall back to the central connection.
+            // When DatabaseTenancyBootstrapper is used, database stores whose 'connection'
+            // config is null fall back to the default DB connection ('tenant'). Reset each
+            // such store to its explicitly configured connection, or fall back to central.
             $this->makeDatabaseCacheStoresCentral($manager);
 
-            // If a bootstrapper (like DatabaseCacheBootstrapper) makes the
-            // cache connection tenant explicitly, the makeDatabaseCacheStoresCentral()
-            // call ends up setting the tenant connection rather than the central one,
-            // and the $adjustCacheManagerUsing callback is needed to
-            // make globalCache use the central connection.
+            // DatabaseCacheBootstrapper explicitly writes 'tenant' into each store's 'connection'
+            // config. makeDatabaseCacheStoresCentral() above would then read 'tenant' as the
+            // configured value (not null) and use it directly, so the central connection fallback
+            // wouldn't be used.
+            //
+            // This callback is used to correct those connections back to central for globalCache.
             if (static::$adjustCacheManagerUsing !== null) {
                 (static::$adjustCacheManagerUsing)($manager);
             }