move NO_MORE_RESULTS to constant

Author: stephenplusplus

lib/datastore/index.js

@@ -221,7 +221,9 @@ var util = require('../common/util.js');
  *       contacts: entities
  *     };
  *
- *     if (info.moreResults !== 'NO_MORE_RESULTS') {
+ *     var moreResultsMayExist = info.moreResults !== datastore.NO_MORE_RESULTS;
+ *
+ *     if (moreResultsMayExist) {
  *       frontEndResponse.nextPageCursor = info.endCursor;
  *     }
  *
@@ -396,6 +398,8 @@ Datastore.int = function(value) {
   return new entity.Int(value);
 };
 
+Datastore.NO_MORE_RESULTS = 'NO_MORE_RESULTS';
+
 /**
  * Create a query for the specified kind. See {module:datastore/query} for all
  * of the available methods.

test/datastore/index.js

@@ -190,6 +190,12 @@ describe('Datastore', function() {
     });
   });
 
+  describe('NO_MORE_RESULTS', function() {
+    it('should expose a NO_MORE_RESULTS helper', function() {
+      assert.strictEqual(Datastore.NO_MORE_RESULTS, 'NO_MORE_RESULTS');
+    });
+  });
+
   describe('createQuery', function() {
     it('should return a Query object', function() {
       var namespace = 'namespace';