Grails

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.0.1
• Fix Version/s: 1.1-beta3
• Component/s: Persistence
• Labels:

  None

As discussed on users mailing list http://www.nabble.com/Multiple-one-to-many-relationships-tt16110042.html

Example project attached to this bug report.

Create the following two classes:

class Group {

    // Every user has a bunch of groups that it owns
    static belongsTo = [ owner : User ]

    // In addition, every group has members that are users
    static hasMany = [ members : User ]
}


class User {
           
    // Every user has a bunch of groups that it owns
    static hasMany = [ groups: Group ]
    static mappedBy = [ groups:"owner" ]
}

Every group is owned by a user (bidirectional one-to-many), and it also contains a list of members (unidirectional one-to-many). When executing grails test-app, we get the following error:

Running script /opt/local/grails-1.0.1/scripts/TestApp.groovy
[0] spring.GrailsWebApplicationContext Refreshing org.codehaus.groovy.grails.commons.spring.GrailsWebApplicationContext@299c3e: display name [org.codehaus.groovy.grails.commons.spring.GrailsWebApplicationContext@299c3e]; startup date [Wed Mar 19 11:27:26 PDT 2008]; root of context hierarchy
[0] spring.GrailsWebApplicationContext Bean factory for application context [org.codehaus.groovy.grails.commons.spring.GrailsWebApplicationContext@299c3e]: org.springframework.beans.factory.support.DefaultListableBeanFactory@4eba57
org.codehaus.groovy.grails.exceptions.GrailsDomainException: No owner defined between domain classes [class User] and [class Group] in a many-to-many relationship. Example: def belongsTo = Group
	at Package_groovy$_run_closure5_closure22.doCall(Package_groovy:231)
	at Package_groovy$_run_closure5_closure22.doCall(Package_groovy)
	at Init_groovy$_run_closure6.doCall(Init_groovy:127)
	at Package_groovy$_run_closure5.doCall(Package_groovy:221)
	at Package_groovy$_run_closure5.doCall(Package_groovy)
	at Bootstrap_groovy$_run_closure2.doCall(Bootstrap_groovy:56)
	at Bootstrap_groovy$_run_closure2.doCall(Bootstrap_groovy)
	at TestApp_groovy$_run_closure9.doCall(TestApp_groovy:259)
	at TestApp_groovy$_run_closure9.doCall(TestApp_groovy)
	at TestApp_groovy$_run_closure3.doCall(TestApp_groovy:115)
	at TestApp_groovy$_run_closure3.doCall(TestApp_groovy)
	at TestApp_groovy$_run_closure1.doCall(TestApp_groovy:63)
	at TestApp_groovy$_run_closure1.doCall(TestApp_groovy)
	at gant.Gant.dispatch(Gant.groovy:271)
	at gant.Gant.this$2$dispatch(Gant.groovy)
	at gant.Gant.invokeMethod(Gant.groovy)
	at gant.Gant.processTargets(Gant.groovy:436)
	at gant.Gant.processArgs(Gant.groovy:372)
	at org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:101)
	at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:130)
Error loading plugin manager: No owner defined between domain classes [class User] and [class Group] in a many-to-many relationship. Example: def belongsTo = Group

Note that by changing the bidirectional relationship to be unidirectional (by setting "static belongsTo = User" in the Group class) the error goes away, but we lose the ability to access the Group's owner.

1. 

   tmp.tgz

   19/Mar/08 1:39 PM

   147 kB

   Michael Burton

• Assignee:

  Graeme Rocher

  Reporter:

  Michael Burton

• Created:

  19/Mar/08 1:39 PM

  Updated:

  18/May/11 8:43 AM

  Resolved:

  23/Jan/09 5:26 AM