CakePHP3 Changing Database Connections in Plugins - php

Question

I have problems with switching a database connection in CakePHP3.
I would like to change the database connection (based on a subdomain, MultiTenant system). But I would like to outsource this connection-change to a plugin.
For this I wrote a small plugin (MTA) with a middleware class, with the following invoke function:
public function __invoke($request, $response, $next)
{
$response = $next($request, $response);
$tenantMap = TableRegistry::get('TenantMappings');
$mapping = $tenantMap->findByName($request->subdomains()[0])->firstOrFail();
ConnectionManager::config("alias_".$request->subdomains()[0], [
'className' => 'Cake\Database\Connection',
'driver' => 'Cake\Database\Driver\Mysql',
'persistent' => false,
'host' => 'localhost',
'username' => '***username***',
'password' => '***password***',
'database' => '***database***',
'encoding' => 'utf8',
'timezone' => 'UTC',
'cacheMetadata' => true,
]);
ConnectionManager::alias ("alias_".$request->subdomains()[0], "default");
Configure::write('Account.active', $mapping->account_id);
return $response;
}
That does not work. Maybe it is already too late to change the connection or set up an alias.
Is there still a possibility to change the connections for all models in a plugin, or do I have to do this earlier (for example in bootstrap.php)?

Answer 1

That should work fine for all tables that are being instantiated after that point, however you need to move the $next() call (which invokes the next middlware in the queue) to the end of the method, otherwise your code will run after the application request has been completed.