Mongoose force validation only if data is present - node.js

Question

I am creating a user model that will create different Strategies like, local, facebook, gmail... and i want every object to do his own validation but if i does not put values in lets say local, i does not want to validate this fields and get an error.
For example:
var UserSchema = new Schema({
local: {
email : {
type : String,
required: true,
validate: emailValidator,
index : {
unique: true
}
},
firstName: {
type : String,
validate: nameValidator,
required: true
},
password : {
type : String,
validate: passwordValidator,
required: true
}
},
facebook: {
id : String,
email: String,
name : String
}
});
Now when i want to save some user that come from facebook like this:
var newUser = new User();
newUser.facebook.id = profile.id;
newUser.facebook.name = profile.name.givenName;
newUser.facebook.email = profile.emails[0].value;
newUser.save(function( err, user ) {
if( err ) console.log(err);
done(null, user);
});
I will get an error because the local object validation failed. So how i can make them not depend on each other and still validate the data when insert the values?

Answer 1

You will have to create a custom validator and check if the proper strategy is set:
var emailValidator = [
{
validator: function(value) {
if(!this.local) return true;
return value;
},
msg: 'Email is required.'
},
{
validator: function(value) {
/* your current validation */
},
msg: 'Your error message...'
}
];
Just move your current emailValidator logic to the second function in this array and do this to the other required fields.