更新猫鼬模型（node.js）中的一个字段
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Update one field in mongoose model (node.js)
提问by user1930848
I have a user schema where I want to update some info, like this.
我有一个用户架构，我想在其中更新一些信息，就像这样。
User.findOne({_id: idd}, function(err, usr){
usr.info = "some new info";
usr.save(function(err) {
});
});
But the model has a hook on save to hash the password
但是模型有一个钩子保存来散列密码
UserSchema.pre('save', function(next) {
if (this.password && this.password.length > 6) {
this.salt = new Buffer(crypto.randomBytes(16).toString('base64'), 'base64');
this.password = this.hashPassword(this.password);
}
next();
});
Now when I try to save it takes the allready hased password and hash it again, any idea how to avoid this?
现在，当我尝试保存它时，需要使用已有的密码并再次对其进行哈希处理，知道如何避免这种情况吗？
回答by BatScream
Use Model.Updateand move the creation of a new password to an independent function.
使用Model.Update并将新密码的创建移至独立函数。
var salt = new Buffer(crypto.randomBytes(16).toString('base64'), 'base64');;
var newPassword = this.hashPassword("someNew password");
User.update({_id: idd}, {
info: "some new info",
password: newPassword
}, function(err, affected, resp) {
console.log(resp);
})
回答by Thomas Decaux
Did you try to use isModified?
你试过用isModified吗？
UserSchema.pre('save', function(next) {
if (this.password && this.password.length > 6 && MYMODEL.isModified('password')) {
this.salt = new Buffer(crypto.randomBytes(16).toString('base64'), 'base64');
this.password = this.hashPassword(this.password);
}
next();
});
