Grails+Mongodb = do not persist object. Why? - mongodb

Question

I have first expirence in grails+mongodb. And I have a problem on saving object. First I connected local mongo db in such way to grails:
grails {
mongo {
host = "localhost"
//port = 27107
//username = "login"
//password="pwd"
databaseName = "db"
}
}
I don't know why, but if I specify port and login+password (I create such user with such password), grails give me an error, that cann't connect to mongodb. This is a log of mongodb on daemon start:
22:47:04 [initandlisten] MongoDB starting : pid=918 port=27017 dbpath=/var/lib/mongodb 64-bit host=ubnt-VirtualBox
Ok, with out port and login+pass it works. Next I create domain:
class Cover {
String name
String url
static constraints = {
name(blank: false)
url(blank: false)
}
static mapping = {
collection "cover"
database "covers"
}
}
I try to save it:
Cover cover = new Cover()
cover.name = title.text()
cover.url = url
println("Try to save object: ${cover.toString()}")
cover.save()
println("After save object: ${cover.toString()}")
What I have in output:
Try to save object: com.mydomain.Cover : (unsaved)
After save object: com.mydomain.Cover : 23
When I run shell with command 'mongo', then try to:
>use covers
>db.cover.find()
I see that there is nothing in collection. But when I look at db.cover.next_id.find() I see 23. So it seems like id increments. I can't figure out why object didn't save to mongodb. Why? Before I try to connect to mongodb and save via java driver and saving works (so mongodb seems to install correctly).
Also when I run shell I see such info >connecting to: test what means test? Where I could configure it before? May be shell connects to one db and grails to another?

Answer 1

For me it seems it's saving without problems unless you've some constraint errors...
Have you tried to print the errors after saving/validating?
println cover.errors
Also you could try to recover all the instances from the application without looking in mongo with
println Cover.list()
If with this last line you can see your saved instances, maybe grails is mixing the databases as you have in databaseName=db and you later say that Cover should be saved to covers database

Answer 2

I have found an error, it discovers for me that source in src/groovy have to access to grails sources in specific way, so to save cover I need to create service in grails, where I cna implemet save method, and they in place where I want to call save I should get service in such way
def ctx = ServletContextHolder.servletContext.getAttribute(GrailsApplicationAttributes.APPLICATION_CONTEXT)
CoverService coverService = ctx.coverService
And now it works.