Javascript 明示承诺抛出错误
我正在使用带有denodeify模块的Express。我尝试异步呈现电子邮件模板时出错Javascript 明示承诺抛出错误,javascript,node.js,asynchronous,express,promise,Javascript,Node.js,Asynchronous,Express,Promise,我正在使用带有denodeify模块的Express。我尝试异步呈现电子邮件模板时出错 .then(function () { return denodeify(res.render)(path.resolve('verify-email'), { name: user.displayName, appName: config.app.title, mail: user.email, url: 'http://'
.then(function () {
return denodeify(res.render)(path.resolve('verify-email'), {
name: user.displayName,
appName: config.app.title,
mail: user.email,
url: 'http://' + req.headers.host
});
})
.then(function (emailHTML) {
// code which is not executed
})
.catch(function (err) {
// [TypeError: Cannot read property 'req' of undefined]
});
我尝试在没有回调的情况下使用res.render,效果很好,但我需要在变量中输出电子邮件模板。
我也不明白如何调试这部分代码。谢谢你的帮助!
全部代码
function sendVerificationEmail(user, req, res) {
return denodeify(crypto.randomBytes)(20)
.then(function (buffer) {
user.verificationToken = buffer.toString('hex');
return user.save();
})
.then(function () {
user.password = undefined;
user.salt = undefined;
delete req.session.redirect_to;
return denodeify(res.render)(path.resolve('modules/users/server/templates/verify-email'), {
name: user.displayName,
appName: config.app.title,
mail: user.email,
url: 'http://' + req.headers.host + '/api/auth/verify/' + user.verificationToken + "/" + user.email
});
})
.then(function (emailHTML) {
const mailOptions = {
to: user.email,
from: config.mailer.from,
subject: 'Verify Email',
html: emailHTML
};
return denodeify(smtpTransport.sendMail)(mailOptions);
});
}
exports.updateAuthData = function (req, res, next) {
const userId = req.session.userId;
delete req.session.userId;
if (!userId) {
return res.status(401).send({
message: 'No active session'
});
}
let user;
User.findById(userId)
.then()
.then((_user) => {
user = _user;
const fields = Object.keys(req.body);
const neededFields = user.getMissingAuthFields();
const missingFields = _.difference(fields, neededFields);
if (missingFields.length !== 0) {
throw new CustomError('Missing fields: ' + missingFields.join(', '))
}
for (let field of User.requiredAuthorizationFields) {
if (!!user[field]) {
throw new CustomError('User already has ' + field);
}
}
User.requiredAuthorizationFields.forEach((field) => user[field] = req.body[field]);
return true;
})
.then(function () {
return sendVerificationEmail(user, req, res);
})
.then(() => {
res.send({
message: 'An email has been sent to the provided email, please verify your account.'
});
})
.catch(function (err) {
res.status(400).send({
message: 'Failure sending email'
});
})
};
我找到了解决方案,我们必须像这样绑定“this”变量
return denodeify(res.render.bind(res))(path.resolve('modules/users/server/templates/verify-email'), {
name: user.displayName,
appName: config.app.title,
mail: user.email,
url: 'http://' + req.headers.host + '/api/auth/verify/' + user.verificationToken + "/" + user.email
});
错误原因是express“res.render”函数中的以下代码
var app = this.req.app;
var done = callback;
var opts = options || {};
var req = this.req;
var self = this;
正确的方法是使用:
denodeify(res.render.bind(res))(路径,选项)
而不是
denodeify(res.render)(path, options)
谢谢大家的回复 如错误所示:
req
未定义。从何处需要此变量?无需承诺即可执行此操作,res.render('verify-email',{name:..},function(err,emailHTML){res.render('index',{email:emailHTML})})代码>请添加整个函数。错误显示某个对象必须具有.req属性,并且该对象未定义,因此,我无法理解这是什么类型的对象..错误不是来自发布的代码-错误清楚地表明错误与试图访问未定义变量的.req
的代码有关。。。在您尚未发布的代码中的某个地方有一个something.**req**。。。当然,您可以从nodejs获得比消息更好的错误转储,您应该能够获得文件、行号和堆栈跟踪