无法从未定义的 Youtube Analytics API 错误中读取 属性 "length"

Question

我是 Youtube Analytics Api 的新手，我在 google 中关注 this guide 以将我的分析报告保存在 google sheet 使用 Google Apps Script。每次我 运行 脚本，我都会得到这样的错误，

TypeError: Cannot read property "length" from undefined.

这是代码，

  function spreadsheetAnalytics() {
  // Get the channel ID
  var myChannels = YouTube.Channels.list('id', {mine: true});
  var channel = myChannels.items[0];
  var channelId = channel.id;
  // Set the dates for our report
  var today = new Date();
  var oneMonthAgo = new Date();
  oneMonthAgo.setMonth(today.getMonth() - 1);
  var todayFormatted = Utilities.formatDate(today, 'UTC', 'yyyy-MM-dd')
  var oneMonthAgoFormatted = Utilities.formatDate(oneMonthAgo, 'UTC', 'yyyy-MM-dd');

    var analyticsResponse = YouTubeAnalytics.Reports.query(
        'channel==' + channelId,
        oneMonthAgoFormatted,
        todayFormatted,
        'views,likes,dislikes,shares',
        {
          dimensions: 'day',
          sort: '-day'
        });

  var ssName = 'YouTube channel report ' + oneMonthAgoFormatted + ' - ' + todayFormatted;
  var numRows = analyticsResponse.rows.length;  // ERROR IN THIS LINE
  var numCols = analyticsResponse.columnHeaders.length;

  var ssNew = SpreadsheetApp.create(ssName, numRows + 1, numCols);
  var sheet = ssNew.getSheets()[0];

  // Get the range for the title columns
  // Remember, spreadsheets are 1-indexed, whereas arrays are 0-indexed
  var headersRange = sheet.getRange(1, 1, 1, numCols);
  var headers = [];

  // These column headers will correspond with the metrics requested
  // in the initial call: views, likes, dislikes, shares
  for(var i in analyticsResponse.columnHeaders) {
    var columnHeader = analyticsResponse.columnHeaders[i];
    var columnName = columnHeader.name;
    headers[i] = columnName;
  }

  headersRange.setValues([headers]);

  headersRange.setFontWeight('bold');
  sheet.setFrozenRows(1);

  var dataRange = sheet.getRange(2, 1, numRows, numCols);
  dataRange.setValues(analyticsResponse.rows);

  var dateHeaders = sheet.getRange(1, 1, numRows, 1);
  dateHeaders.setFontWeight('bold');
  sheet.setFrozenColumns(1);

  var range = sheet.getRange(1, 1, numRows, numCols);
  var chart = sheet.newChart()
                   .asColumnChart()
                   .setStacked()
                   .addRange(range)
                   .setPosition(4, 2, 10, 10)
                   .build();
  sheet.insertChart(chart);
}

我没有编辑指南中的任何代码。完全按照给出的内容进行操作。我怎样才能摆脱这个错误？

Answer 1

就像错误说 rows 未定义一样。这是因为该查询没有返回数据。

来自以下位置的文档：https://developers.google.com/youtube/analytics/v1/reference/reports/query#response

If no data is available for the given query, the rows element will be omitted from the response.