我知道这些问题的变体已被多次询问。我的理解是你基本上必须观察你的if / else逻辑，并确保select User,
Count(case when item = 'A' then 1 end) as `Count of A`,
Count(case when item = 'B' then 1 end) as `Count of B`
From yourtable
Group by User
没有被多次调用。
Twitter和Google工作得很好。 Facebook虽然给了我这个错误：
donepassport.js
Error: Can't set headers after they are sent.
at ServerResponse.OutgoingMessage.setHeader (_http_outgoing.js:335:11)
at ServerResponse.header (/Users/azerner/code/mean-starter/node_modules/express/lib/response.js:718:10)
at ServerResponse.location (/Users/azerner/code/mean-starter/node_modules/express/lib/response.js:835:8)
at ServerResponse.redirect (/Users/azerner/code/mean-starter/node_modules/express/lib/response.js:874:8)
at complete (/Users/azerner/code/mean-starter/node_modules/passport/lib/middleware/authenticate.js:241:26)
at /Users/azerner/code/mean-starter/node_modules/passport/lib/middleware/authenticate.js:250:15
at pass (/Users/azerner/code/mean-starter/node_modules/passport/lib/authenticator.js:427:14)
at Authenticator.transformAuthInfo (/Users/azerner/code/mean-starter/node_modules/passport/lib/authenticator.js:449:5)
at /Users/azerner/code/mean-starter/node_modules/passport/lib/middleware/authenticate.js:247:22
at /Users/azerner/code/mean-starter/node_modules/passport/lib/http/request.js:51:7
at pass (/Users/azerner/code/mean-starter/node_modules/passport/lib/authenticator.js:273:43)
at serialized (/Users/azerner/code/mean-starter/node_modules/passport/lib/authenticator.js:282:7)
at /Users/azerner/code/mean-starter/server/passport.js:17:5
at pass (/Users/azerner/code/mean-starter/node_modules/passport/lib/authenticator.js:290:9)
at Authenticator.serializeUser (/Users/azerner/code/mean-starter/node_modules/passport/lib/authenticator.js:295:5)
at IncomingMessage.req.login.req.logIn (/Users/azerner/code/mean-starter/node_modules/passport/lib/http/request.js:48:29)
auth.routes.js
var LocalStrategy = require('passport-local').Strategy;
var FacebookStrategy = require('passport-facebook').Strategy;
var TwitterStrategy = require('passport-twitter').Strategy;
var GoogleStrategy = require('passport-google-oauth').OAuth2Strategy;
var mongoose = require('mongoose');
var User = mongoose.model('User');
var Local = mongoose.model('Local');
var Facebook = mongoose.model('Facebook');
var Twitter = mongoose.model('Twitter');
var Google = mongoose.model('Google');
var bcrypt = require('bcrypt');
var config = require('./config.json');
module.exports = function(passport) {
passport.serializeUser(function(user, done) {
done(null, user._id);
});
passport.deserializeUser(function(id, done) {
User
.findById(id).populate('local').exec()
.then(function(user) {
console.log('deserializeUser found user: ', user);
done(null, user);
}, done)
;
});
// LOCAL
passport.use(new LocalStrategy(function(username, password, done) {
Local
.findOne({ username: username })
.select('username role hashedPassword')
.exec()
.then(function(local) {
if (!local) {
return done(null, false);
}
var validPassword = bcrypt.compareSync(password, local.hashedPassword);
if (!validPassword) {
return done(null, false);
}
else {
User
.findOne({ local: local })
.populate('local')
.exec()
.then(function(user) {
return done(null, user);
})
;
}
})
;
}));
// FACEBOOK
passport.use(new FacebookStrategy({
clientID: config.facebookAuth.clientID,
clientSecret: config.facebookAuth.clientSecret,
callbackURL: config.facebookAuth.callbackURL
}, function(token, refreshToken, profile, done) {
// asynchronous
process.nextTick(function() {
Facebook
.findOne({ id: profile.id })
.select('id token')
.exec()
.then(function(facebook) {
if (facebook) {
User
.findOne({ facebook: facebook._id }).exec()
.then(function(user) {
return done(null, user);
})
;
}
else {
Facebook
.create({ id: profile.id, token: token })
.then(function(createdFacebook) {
User
.create({ facebook: createdFacebook })
.then(function(user) {
return done(null, user);
})
;
})
;
}
})
.then(function(err) {
return done(err);
})
;
});
}));
// TWITTER
passport.use(new TwitterStrategy({
consumerKey: config.twitterAuth.consumerKey,
consumerSecret: config.twitterAuth.consumerSecret,
callbackURL: config.twitterAuth.callbackURL
}, function(token, tokenSecret, profile, done) {
process.nextTick(function() {
Twitter
.findOne({ id: profile.id })
.select('id token')
.exec()
.then(function(twitter) {
if (twitter) {
User
.findOne({ twitter: twitter._id }).exec()
.then(function(user) {
return done(null, user);
})
;
}
else {
Twitter
.create({ id: profile.id, token: token })
.then(function(createdTwitter) {
User
.create({ twitter: createdTwitter })
.then(function(user) {
return done(null, user);
})
;
})
;
}
})
.then(null, function(err) {
return done(err);
})
;
});
}));
// GOOGLE
passport.use(new GoogleStrategy({
clientID: config.googleAuth.clientID,
clientSecret: config.googleAuth.clientSecret,
callbackURL: config.googleAuth.callbackURL
}, function(token, refreshToken, profile, done) {
process.nextTick(function() {
Google
.findOne({ id: profile.id })
.select('id token')
.exec()
.then(function(google) {
if (google) {
User
.findOne({ google: google._id }).exec()
.then(function(user) {
return done(null, user);
})
;
}
else {
Google
.create({ id: profile.id, token: token })
.then(function(createdGoogle) {
User
.create({ google: createdGoogle })
.then(function(user) {
return done(null, user);
})
;
})
;
}
})
.then(null, function(err) {
return done(err);
})
;
});
}));
};
值得注意的是，我一直在使用this阻止Facebook，但我解除了阻止它的工作。我做了命令，强行退出Chrome并重新打开它，现在我可以登录facebook.com了。
编辑：哦，我检查了MongoHub，它显示用户（和Facebook子文档）已经创建。