Grails MongoDB Lists do not update, am I doing something wrong? - mongodb

Question

I am currently using Grails 2.5.4, with the MongoDB plugin (org.grails.plugins:mongodb:6.0.0.RC1) and whenever I try to update a List of any domain class, it doesn't work, example:
Votation class:
class Votation {
String question
int minVotes
List <VoteOption> options
User owner
Chat chat
static belongsTo = [chat: Chat]
static embedded = ['options']
static constraints = {
owner nullable: false
chat nullable: false
//question nullable: false
}
VoteOption class:
class VoteOption {
String option
String url
List <User> voters
static belongsTo = [chat: Chat]
}
When I try to update the list:
//some more code...
Votation votation = Votation.findById(votationId as Long)
VoteOption option = votation.options.find { it.option == votationOption }
User user = User.findOrCreateNew(params.user)
if (option.voters) {
option.voters.add(user) // THIS DOESN'T WORK!
}
else {
option.voters = [user] //This DOES work
}
This is just an example, I have 2 more domain classes that also have Lists, and they don't work either.
Restarting Grails does not fix this, and this also happens on the other developer's computer, so it's not my enviroment. Everything else is saved correctly

Answer 1

Try this
//some more code...
Votation votation = Votation.findById(votationId as Long)
VoteOption option = votation.options.find { it.option == votationOption }
User user = User.findOrCreateNew(params.user)
if (user) {
option.addToVoters(user) // <----
}
option.save(flush:true, failOnError:true)
Ref: http://docs.grails.org/2.1.0/ref/Domain%20Classes/addTo.html