mongodb - Mongo username and email unique fields validation -


hi want tell user 1 taken if username or email way im validating in save function if finds duplicate give error 11000 cant specify 1 taken. want error give index or can put in if statement explaining 1 duplicate key can more specific error. there way can accomplish this? why im getting index: 0? shouldn't different each field? let me know if have questions.

schema

var user = db.schema({   name:       { type: string,  required: true},   username:   { type: string,  required: true, index: { unique: true }},   email:      { type: string,  required: true, index: { unique: true }},   password:   { type: string,  required: true, select: false},   admin:      { type: boolean, required: true},   verify:     { type: boolean, required: true},   created_at: { type: string,  required: true, default: date.now },   updated_at: { type: string,  required: true, default: date.now },   campaigns_donated: [] })

post action

router.post('/register', function(req, res){   var user = new user()    user.name     = req.body.name   user.username = req.body.username   user.email    = req.body.email   user.password = req.body.password   user.admin    = false,   user.verify   = false    user.save(function(err) {     if (err) {       console.log(err);       if (err.code == 11000) {         return res.json({ success: false, message: 'username or email taken'})       } else {         return res.send(err);       }     }     res.json({ success: true, message: 'user created'})   }) })

pre save function

user.pre('save', function(next) {   var user =   // hash password if password has been changed or user new   if (!user.ismodified('password')) { return next() }    //generate hash function   bcrypt.hash(user.password, 10, function(err, hash) {     if (err)  return next(err)     //change password hash     user.password = hash     next()   }) })

console log error 

{ [mongoerror: e11000 duplicate key error index: reachpeeps.users.$username_1 dup key: { : "xandor" }]   name: 'mongoerror',   message: 'e11000 duplicate key error index: reachpeeps.users.$username_1 dup key: { : "xandor" }',   index: 0,   code: 11000,   errmsg: 'e11000 duplicate key error index: reachpeeps.users.$username_1 dup key: { : "xandor" }' }


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