Grails Mongodb plugin does not save

Question

I have a requirement in my grails app to connect to an existing mongodb server. I am using the plugin ':mongodb:3.0.3' to do this. I have a domain class that is basically empty

 class Thing {
    static mapWith = "mongo"

    String id
    String name

    static constraints = { }

    static mapping = {
        collection "myThing"
        id column: '_id', generator: 'assigned'
        version false
    }
}

And I am trying to save a new domain object in an integration test -- a precursor to a controller action:

def "create the thing"() {
    def thing = new Thing(name: "name", id:"foobar")

    when:
    def foo = thing.save(flush: true, failOnError:true)

    then:
    Thing.findByName("name")
}

The test fails because Thing.findByName returns null, however, when I dig into the low level API, I can save an object. The following test passes:

def "create the thing low level"() {
    when:
    Thing.collection.insert([name:"name"])

    then:
    Thing.findByName("name")
}

I have looked at the other stackoverflow questions and they seem to deal with:

• Not using flush, which I am
• Not having the configuration setup propertly, which I do because I have been fetching records from it, and the low level API works.
• constraint errors which I don't have since failOnError is true

What am I doing wrong? How can I get GORM saves to work because I would like to use the grails tools available.

NOTE : This is not just a test issue, trying to save something in a controller using GORM also does not work. Calling this action:

def save() {
    def thing = new Thing()
    thing.name = "foobar"
    respond thing.save(failOnError: true, flush: true)
}

Returns { "class": "com.Thing", "id": null, "name": "foobar" } and a look at the database tells me it is not saved.

Answer 1

You must add this line at the top of your integration test and it should start saving. By default GORM will not persists even in IntegrationTests

static Boolean transactional = false

You test would look something like below,

class TestIntegrationSpec extends IntegrationSpec {
   static Boolean transactional = false

   def "my test"() {
     ...
   }
   ...
}