grails bidirectional relationship in abstract classes -

i trying define grails domain model abstract classes. need define 2 abstract classes have one-to-one bidirectional relationship each other , can't bring them work.

explanation based on face-nose example of documentation:

i implemented example , wrote test works expected: if set end of relationship, grails sets other end.

class face {     static hasone = [nose:nose]      static constraints = {         nose nullable: true, unique:true     } }  class nose {     face face     static belongsto = [face]      static constraints = {         face nullable:true     } }       when:'set nose on face'         def testface = new face().save()         def testnose = new nose().save()          testface.nose = testnose         testface.save()      then: 'bidirectional relationship'         testface.nose == testnose         testnose.face == testface 

if declare these 2 classes abstract , repeat same test 2 concrete subclasses (concreteface , concretenose without attribute), second assertion false: testnose.face null.

am doing somthing wrong? if not, how can factorize relationships in abstract domain classes?

you have more save()'s needed, , logic inside nose wrong. first, face class is; let's paste here completion:

class face {     static hasone = [nose:nose]     static constraints = {       nose nullable:true, unique: true    } } 

next, nose:

class nose {     static belongsto = [face:face]     static constraints = {    } } 

note here once have belongsto relationship, can't have face -- parent -- nullable in constraints section.

last, integration test. make sure it's integration test , not unit test. integration testing needed when you're testing database-related logic (crud ops), not mocking ops unit tests do. here:

def "test bidirectionality integration"() {    given: "a fresh face , nose"    def face = new face()    def nose = new nose(face:face)    face.setnose(nose)     when: "the fresh organs saved"    face.save()     then: "bidirectionality achieved"    face.nose == nose    nose.face == face } 

note here save nose not needed, saving face persists nose. may add statement nose.save() after face.save() give nothing here, not before -- can't save child before it's parent nicely settled in tables.

do , 'll 1 of these:

|tests passed - view reports in ...