我有对象数组，即用户，我在async.each中使用async.parallel。现在，我没有在async.each中得到回复。我的代码如下：
exports.addUserByCSV = function (req, res) {
var users = req.body;
async.each(users,
function (user, callback) {
var user = new User({
username: user.email,
password: user.email.split('@')[0],
ipAddress: req.ip,
firstname: user.firstname,
lastname: user.lastname,
email: user.email,
employeeCode: user.employeeCode,
dateOfJoining: user.dateOfJoining,
dateOfAnniversary: user.dateOfAnniversary,
dateOfBirth: user.dateOfBirth,
employeeStatus: user.employeeStatus,
iw: user.iw,
fatherName: user.fatherName,
aliasName: user.aliasName,
aliasEmail: user.aliasEmail,
panNo: user.panNo,
gender: user.gender,
maritalStatus: user.maritalStatus,
biometricId: user.biometricId,
shift: user.shift,
nextApprisalDate: user.nextApprisalDate,
esiNo: user.esiNo,
pfNo: user.pfNo,
bankAccNo: user.bankAccNo,
situtation: user.situtation,
phone: user.phone,
mobile: user.mobile,
fax: user.fax,
website: user.website,
address: user.address,
city: user.city,
state: user.state,
zip: user.zip,
country: user.country
});
userAdd(user, function (err, user) {
console.log(user)
callback(err);
});
},
function (err) {
res.send({ error: err, message: config.msg.SUCCESSFULLY_ADDED, user: 'User create Successfully' });
}
);
function userAdd(user) {
//console.log(user)
user.register(user, function (err, user) {
async.parallel({
leave: function (callback) {
//add some leaves for user
_availLeaves(req.ID, user._id, function (err, leaves) {
callback(err, leaves);
});
},
salary: function (callback) {
//add salary structure for employee
_salaryStructure(req.ID, user._id, function (err, structure) {
callback(err, structure);
});
}
}, function (err, results) {
console.log(results)
if (!err) { return results; }
res.send({ error: err, message: config.msg.SUCCESSFULLY_ADDED, user: 'User create Successfully' });
});
});
}
}
function _salaryStructure(loginId, userId, cb) {
var structure = new Structure({
userId: userId,
addedBy: loginId,
});
structure.save(function (err, structure) {
cb(err, structure);
});
}
function _availLeaves(loginId, userId, cb) {
var leave = new LeaveAvailable({
"userId": userId,
"bl": 0.50,
"fl": 2,
"cl": 1,
"pl": (new Date().getDate() <= 15) ? 0.75 : 0
});
leave.save(function (err, leaves) {
cb(err, 'leavesAdded')
});
}
如果我在res.send中写async.parallel，那么我会遇到以下问题：
Error: Can't set headers after they are sent.
如果我在res.send中写async.each，那么我没有得到任何回复。
答案 0 :(得分：0)
问题是，您为每个用户调用了res.send，因此多次。相反，您可以将res.write （每次）与res.end 组合（在所有用户都已写完后）。
有关详细信息，请查看this。
因此，您更新的代码可能如下所示：
exports.addUserByCSV = function(req, res) {
var users=req.body;
async.each(users,
function(user, callback){
var user = new User({
username: user.email,
password: user.email.split('@')[0],
ipAddress: req.ip,
firstname: user.firstname,
lastname: user.lastname,
email: user.email,
employeeCode: user.employeeCode,
dateOfJoining:user.dateOfJoining,
dateOfAnniversary:user.dateOfAnniversary,
dateOfBirth:user.dateOfBirth,
employeeStatus: user.employeeStatus,
iw: user.iw,
fatherName:user.fatherName,
aliasName:user.aliasName,
aliasEmail:user.aliasEmail,
panNo:user.panNo,
gender:user.gender,
maritalStatus:user.maritalStatus,
biometricId:user.biometricId,
shift:user.shift,
nextApprisalDate:user.nextApprisalDate,
esiNo:user.esiNo,
pfNo:user.pfNo,
bankAccNo:user.bankAccNo,
situtation:user.situtation,
phone: user.phone,
mobile: user.mobile,
fax: user.fax,
website: user.website,
address: user.address,
city: user.city,
state: user.state,
zip: user.zip,
country: user.country
});
userAdd(user,function(err,user){
console.log(user)
callback(err);
});
},
function(err){
if (!err)
res.end();
//TODO: Handle error
}
);
function userAdd(user){
//console.log(user)
user.register(user, function(err, user) {
async.parallel({
leave:function(callback){
//add some leaves for user
_availLeaves(req.ID,user._id,function(err,leaves){
callback(err,leaves);
});
},
salary:function(callback){
//add salary structure for employee
_salaryStructure(req.ID,user._id,function(err,structure){
callback(err,structure);
});
}
}, function(err, results) {
console.log(results)
if(!err){return results;}
res.write(JSON.stringify({error: err,message:config.msg.SUCCESSFULLY_ADDED,user:'User create Successfully'}));
});
});
}
}
function _salaryStructure(loginId,userId,cb){
var structure = new Structure({
userId: userId,
addedBy: loginId,
});
structure.save(function(err,structure){
cb(err,structure);
});
}
function _availLeaves(loginId,userId,cb){
var leave = new LeaveAvailable({
"userId":userId,
"bl" : 0.50,
"fl" : 2,
"cl" : 1,
"pl" : (new Date().getDate()<=15)?0.75:0
});
leave.save(function(err,leaves){
cb(err,'leavesAdded')
});
}
答案 1 :(得分：0)
这是一个复杂的代码 - 当然不是重现问题的最小例子 - 所以让我给你一个一般的解释，你可以用它来追踪和解决你的问题。
async.parallel和async.each非常不同。
使用parallel并行运行一组函数。使用each，您可以将单个iteratee函数应用于集合中的每个元素，也可以并行。
在每种情况下，您都需要确保每个函数在某个时刻（错误或成功）调用其回调，否则整个操作将无法完成。
现在，在每次操作完成后，您需要调用res.send()方法一次。
E.g。如果你有这样的事情：
async.each(collection, (element, cb) => {
// you should not return response here
}, err => {
// you should return response here
});
无论你在上面的iteratee函数中有什么，
都是如此请参阅：