Implement listCollections and use listCollections to implement getCollectionNames

lib/database.js

@@ -104,20 +104,24 @@ Database.prototype.runCommand = function (opts, cb) {
   })
 }
 
-Database.prototype.getCollectionNames = function (cb) {
-  function mapCollectionNames (collection) {
-    return collection.name
-  }
-
+Database.prototype.listCollections = function (cb) {
   this._getConnection(function (err, connection) {
     if (err) { return cb(err) }
+
     connection.listCollections().toArray(function (err, collections) {
       if (err) { return cb(err) }
-      cb(null, collections.map(mapCollectionNames))
+      cb(null, collections)
     })
   })
 }
 
+Database.prototype.getCollectionNames = function (cb) {
+  this.listCollections(function (err, collections) {
+    if (err) { return cb(err) }
+    cb(null, collections.map(function (collection) { return collection.name }))
+  })
+}
+
 Database.prototype.createCollection = function (name, opts, cb) {
   if (typeof opts === 'function') return this.createCollection(name, {}, opts)