Select observations based on Quality Bands , Google Earth Engine

Question

From the following NDVI collection, I want to keep only the observations with Good Quality (equal to zero). I try to do this with the SummaryQA but I get "Pattern 'SummaryQA' did not match any bands". My attempt:

var geometry = /* color: #0b4a8b */ee.Geometry.Polygon(
  [[[110.49279650854476, 39.617434795765476],
    [111.02014025854476, 36.57484614339866],
    [117.48010119604476, 36.92695433193529],
    [117.43615588354476, 40.35816406661026]]]),modis =ee.ImageCollection("MODIS/006/MOD13Q1")
    .filterBounds(geometry)
    .map(function(image){return image.clip(geometry)}) 
    .filter(ee.Filter.calendarRange(4,7,'month'));
    var modisNDVI = modis.select("NDVI");

    var maskQA = function(image) {
      return image.updateMask(image.select("SummaryQA").eq(0));
    };
    var best = modisNDVI.map(maskQA)
    print(best)

Answer 1

When you select NDVI band, you are only keeping that band, so you cannot use other band.

Replace

var modisNDVI = modis.select("NDVI");

with

var modisNDVI = modis.select(["NDVI", "SummaryQA"]);