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

mbroadst · mbroadst · commit 4a0cfebbb244 · 2017-12-04T17:14:49.000-05:00
NODE-1147
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

Original file line number	Diff line number	Diff line change
`@@ -687,6 +687,8 @@ Db.prototype.listCollections = function(filter, options) {`
`687`	`687`	`// Ensure valid readPreference`
`688`	`688`	`if (options.readPreference) {`
`689`	`689`	`options.readPreference = convertReadPreference(options.readPreference);`
	`690`	`+ } else {`
	`691`	`+ options.readPreference = this.s.readPreference \|\| ReadPreference.primary;`
`690`	`692`	`}`
`691`	`693`
`692`	`694`	`// We have a list collections command`