fix(list-collections): ensure default of primary ReadPreference

NODE-1147
mongodb · Dec 4, 2017 · 4a0cfeb · 4a0cfeb
1 parent aa5e705
commit 4a0cfeb
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/lib/db.js b/lib/db.js
@@ -687,6 +687,8 @@ Db.prototype.listCollections = function(filter, options) {
   // Ensure valid readPreference
   if (options.readPreference) {
     options.readPreference = convertReadPreference(options.readPreference);
+  } else {
+    options.readPreference = this.s.readPreference || ReadPreference.primary;
   }
 
   // We have a list collections command