fix: handle url default db name

Co-authored-by: Nico Flaig <[email protected]>
Signed-off-by: Rifa Achrinza <[email protected]>

Author: achrinza

lib/mongodb.js

@@ -325,6 +325,15 @@ MongoDB.prototype.connect = function(callback) {
       if (callback) callback(err);
     }
 
+    const urlObj = new URL(self.settings.url);
+
+    if ((urlObj.pathname === '' ||
+        urlObj.pathname.split('/')[1] === '') &&
+        typeof self.settings.database === 'string') {
+      urlObj.pathname = self.settings.database;
+      self.settings.url = urlObj.toString();
+    }
+
     new mongodb.MongoClient(self.settings.url, validOptions).connect(function(
       err,
       client,