grails DefaultGrailsDomainClass.getIdentifier always returns 'id as identifier

Question

I'm trying to write a generator for an angular-based CRUD application (scaffolding, but client-side, using angular)

Part of it consists on extracting the meta-information from GORM Now, I've hit a hard wall, apparently.

I want to handle the case where the ID field is not generated, but managed by the application. Say I have a class definition like:

@Resource(readOnly = false, formats = ['json', 'xml'])
class Phone {

    int age
    String phoneId
    String imageUrl
    String name
    String snippet

    static mapping = {
        id name: 'phoneId', generator: 'assigned'
}

    static constraints = {
        snippet(nullable: true, maxSize: 2000)
    }
}

I would like to retrieve the field serving as identifier for this class, which here should be 'phoneId'.

But if I ask for:

grailsApplication.getDomainClass(com.phonecat.Phone.getName()).identifier

What I get instead is a Property, called 'id' of type Long:

DefaultGrailsDomainClassProperty@6e59cb9b name = 'id', type = Long, persistent = true, optional = false, association = false, bidirectional = false, association-type = [null]]

Am I mis-using the getIdentifier method? Is there something I missed? Or have I hit a bug in Grails/GORM?

For completeness, here is the version of GORM I'm using (as far as I can tell... so many things changed recently on gorm side...):

from build.groovy:

compile "org.grails.plugins:hibernate5"
compile "org.hibernate:hibernate-core:5.1.2.Final"
compile "org.hibernate:hibernate-ehcache:5.1.2.Final"

Also, I'm using grails console plugin to run these tests:

runtime 'org.grails.plugins:grails-console:2.0.6'

(which I find really great) But probably the same could be run from within the normal command-line console.

Here is the code I used:

import com.phonecat.*

println grailsApplication.getDomainClass(Phone.getName()).identifier

def d = grailsApplication.getDomainClass(Phone.getName())
println "${d.class} ${d.clazz.name} ${d.identifier}"

def pd = Phone.findAll().each {c ->
    println "${c.id} ${c.phoneId}"
}
null

The question is: supposing (as it actually happens to be ...) that I'm writing a plugin to retrieve the meta-information about a domain class; How can I obtain from GORM the information that this class has been assigned the field 'phoneId' as unique identifier, and this is the value I should look at when querying the resource through REST?

Answer 1

Generally you should favour the GORM API instead of the GrailsDomainClass if you want to inspect the mapping of you model. To do that you need to get a reference to the MappingContext (it can be dependency injected by Spring). Then:

 PersistentEntity entity = mappingContext.getPersistentEntity(Phone.name)
 println entity.identity.name