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[英]Uncaught TypeError: Cannot read property 'toString' of undefined
[英]TypeError: Cannot read property 'toString' of undefined - why?
這是發生這種情況的第 (50) 行:
var meetingId = meeting._id.toString(),
這是完整的相關代碼:
var MongoClient = require('mongodb').MongoClient;
var assert = require('assert');
var ObjectId = require('mongodb').ObjectID;
var config = require('./config'),
xlsx = require('./xlsx'),
utils = require('./utils'),
_ = require('lodash'),
url = config.DB_URL;
var meetings = [];
function findNumberOfNotesByMeeting(db, meeting, callback) {
var meetingId = meeting._id.toString(),
meetingName = meeting.name.displayValue,
attendees = meeting.attendees;
host = meeting.host;
var count = 1, pending = 0, accepted = 0;
console.log("==== Meeting: " + meetingName + '====');
_.each(attendees, function(item) {
console.log(count++ + ': ' + item.email + ' (' + item.invitationStatus + ')');
if (item.invitationStatus == 'pending') { pending++; }
else if (item.invitationStatus == 'accepted') { accepted++; }
});
console.log("*** " + attendees.length + ", " + pending + "," + accepted);
db.collection('users').findOne({'_id': new ObjectId(host)}, function(err, doc) {
var emails = [];
if (doc.emails) {
doc.emails.forEach(function(e) {
emails.push(e.email + (e.primary ? '(P)' : ''));
});
}
var email = emails.join(', ');
if (utils.toSkipEmail(email)) {
callback();
} else {
db.collection('notes').find({ 'meetingId': meetingId }).count(function(err, count) {
if (count != 0) {
console.log(meetingName + ': ' + count + ',' + attendees.length + ' (' + email + ')');
meetings.push([ meetingName, count, email, attendees.length, pending, accepted ]);
}
callback();
});
}
});
}
function findMeetings(db, meeting, callback) {
var meetingId = meeting._id.toString(),
host = meeting.host;
db.collection('users').findOne({'_id': new ObjectId(host)}, function(err, doc) {
var emails = [];
if (!err && doc && doc.emails) {
doc.emails.forEach(function(e) {
emails.push(e.email + (e.primary ? '(P)' : ''));
});
}
var email = emails.join(', ');
if (utils.toSkipEmail(email)) {
callback();
} else {
db.collection('notes').find({ 'meetingId': meetingId }).count(function(err, count) {
if (count != 0) {
var cursor = db.collection('meetings').find({
'email': {'$regex': 'agu', '$options': 'i' }
});
}
callback();
});
}
cursor.count(function(err, count) {
console.log('count: ' + count);
var cnt = 0;
cursor.each(function(err, doc) {
assert.equal(err, null);
if (doc != null) {
findNumberOfNotesByMeeting(db, doc, function() {
cnt++;
if (cnt >= count) { callback(); }
});
}
});
});
});
}
MongoClient.connect(url, function(err, db) {
assert.equal(null, err);
findMeetings(db, function() {
var newMeetings = meetings.sort(function(m1, m2) { return m2[1] - m1[1]; });
newMeetings.splice(0, 0, [ 'Meeting Name', 'Number of Notes', 'Emails' ]);
xlsx.writeXLSX(newMeetings, config.xlsxFileNameMeetings);
db.close();
});
});
正如您所看到的,會議變量(我幾乎 100% 肯定是問題所在,而不是 _id 屬性)作為參數傳入之前的函數 findNumberOfNotesByMeeting。 我在這里找到了一些關於我的新函數可能是異步的並且需要回調這一事實的信息,但我試圖這樣做並且不確定如何讓它工作,或者即使這是正確的修復對於我的代碼。
您沒有將meeting
對象傳遞給findMeetings
,它期望它作為第二個參數。 該函數不是獲取meeting
對象,而是在其位置接收回調函數,因此嘗試執行meeting._id
是未定義的。
其實findMeetings
函數的目的是什么? 它的名稱表明它可以找到數據庫中的所有會議,或者具有特定 ID 的所有會議。 您在沒有會議 ID 的情況下調用它,表明您可能正在嘗試查找所有會議,但它的實現需要一個會議對象。 您需要先清除它。
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