Problem with scaffolding creating a new object which includes an embedded object

[stephent]

Hi,

I have been searching for an answer to this for a while and have not found one but if one is out there then please just point me at it.

I am using Grails 2.1.1 and am trying to use the scaffolding for editing something with an embedded object. Even trying the example from this page fails: http://grails.org/doc/latest/ref/Domain Classes/embedded.html

This is the code for the model, which looks reasonable:

class Person {

        String name
        Country bornInCountry
        Country livesInCountry

        static embedded = ['bornInCountry', 'livesInCountry']
}

// If you don't want an associated table created for this class, either
// define it in the same file as Person or put Country.groovy under the
// src/groovy directory.

class Country {
        String iso3
        String name
}

And that creates a Person table which includes the four columns for the two properties of the two Country objects.

I have a controller like this:

class PersonController {
        def scaffold = Person
}

And when I access the person/create page, I get this error:

   Line | Method
->> 464 | runTask in /person/create
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Caused by GrailsTagException: Error executing tag <g:form>: Error executing tag <g:render>: Error evaluating expression [countryInstance.id] on line [10]: Cannot get property 'id' on null object
->>  36 | doCall  in /person/create
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Caused by GrailsTagException: Error executing tag <g:render>: Error evaluating expression [countryInstance.id] on line [10]: Cannot get property 'id' on null object
->>  31 | doCall  in /person/create
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Caused by GroovyPagesException: Error evaluating expression [countryInstance.id] on line [10]: Cannot get property 'id' on null object
->>  10 | run     in /person/_form.gsp
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Caused by NullPointerException: Cannot get property 'id' on null object
->>  10 | doCall  in person__form_gsp$_run_closure8
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|    31 | doCall  in person_create$_run_closure2_closure24
|    36 | doCall  in person_create$_run_closure2
|    38 | run     in person_create
|   886 | runTask in java.util.concurrent.ThreadPoolExecutor$Worker
|   908 | run     in     ''
^   662 | run . . in java.lang.Thread

Is the default scaffolding just not able to handle the embedded case or have I done something wrong? If I need to write a custom gsp then I will do so, but it just seemed that I must be doing something wrong for this not to work.

Thanks