listCollections ignores read preference

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      Assume this code:

      var MongoClient = require('mongodb').MongoClient;
MongoClient.connect('mongodb://SERVER:27017/test?readPreference=secondaryPreferred', function(err, db) {
	db.listCollections().toArray().then(collections => console.log(collections)).then(() => db.close());
});

      This should list all collections in the 'test' db, regardless of whether 'SERVER' is currently a primary or not.

      This does not work: if SERVER is a secondary, then this will log something like:

      (node:16946) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): MongoError: not master and slaveOk=false

      I think the problem can be fixed with the attached patch.

        1. 0001-Use-the-read-preference-of-the-connection-when-listi.patch
          1 kB
          Andreas Kohn

              Assignee:
              Matt Broadstone
              Reporter:
              Andreas Kohn
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