Error Call to undefined method MongoDB\Database::connect(). about laravel-mongodb HOT 9 CLOSED

Before we do that, what's the use case for this? The driver manages connections automatically, and except for in special circumstances, the user shouldn't have to worry about them. Note that the driver doesn't allow closing the connection either, and unless you disable client persistence (which we don't recommend except for very special circumstances) even unsetting the client instance will not close the connection.

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@hans-thomas: regarding your solution in #2649 (comment), listing database names goes beyond what's needed to ensure the driver actually connects, and in some environments that might also require special privileges on the authenticated user. The simplest approach would be to issue a ping command (admin database would be a fine choice). Alternatively, you can call Manager::selectServer() since topology discovery is a precondition of server selection, and that will ensure the driver initializes its connections. When selecting a server, I'd also suggest using "primaryPreferred" instead of "primary" to avoid potential server selection failures if the primary was temporarily unavailable (assuming we only care about socket initialization here).

Per your other comment in #2649 (comment), what is the relation to SQLiteDriver? Or were you just using that as an example of the ConnectsToDatabase trait?

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Thank you for your comment. I will give it a try later.

Per your other comment in #2649 (comment), what is the relation to SQLiteDriver? Or were you just using that as an example of the ConnectsToDatabase trait?

Nothing, I just wanted to clarify that there is no connect method publically available on DB facade. I used SQLiteDriver for example to check connect method availability.

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Closing as solutions to check the connection have been provided by @jmikola:

use Illuminate\Support\Facades\DB;
use MongoDB\Driver\ReadPreference;
use MongoDB\Laravel\Connection;

DB::connection()->getMongoClient()->getManager()->selectServer(new ReadPreference(ReadPreference::PRIMARY_PREFERRED));

The method Illuminate\Database\Connectors\ConnectorInterface::connect() must return a PDO instance, which we can't do. So we will not implement this method.

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That seems acceptable to me. Let’s do it.

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I think this should answer your need.

DB::connection()->getMongoClient()->listDatabaseNames()

If it connects successfully, it will return database names as ArrayIterator.
But if it fails, it will throw MongoDB\Driver\Exception\ConnectionTimeoutException exception.

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Would you like to implement the connect function ? It seems to be in Eloquent.

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@GromNaN The connect method is declared here that used in SQLiteDriver class. The SQLiteDriver is registered in SQLiteConnection in a protected getter method. So, there is no way to call connect.
I can create a method on MongoDB\Laravel\Connection to check the connection using the given configs and name it checkConnection or something like this to check the connection status and return a boolean as the result. do you agree with this solution?

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@GromNaN I think it's better to make a new ping method on Connection class to make it easy for users to access this feature.

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