dvkvarma opened a new issue, #14457:
URL: https://github.com/apache/grails-core/issues/14457
When we configure hasMany property to be sorted by a sub-property, its
throwing an NPE. This confguration was working fine in grails-2.
```groovy
class Person {
String firstName
String lastName
static hasMany = [devices: PersonDevice]
static mapping = [
devices cascade: 'all-delete-orphan', sort: 'device.priority'
]
}
class Device {
String name
Integer priority
}
class PersonDevice {
Device device
Date purchaseDate
}
```
Here i would like sort the **person.devices** by **device.priority**.
Getting the following exception on grails app startup.
```
Caused by: java.lang.NullPointerException: null
at
org.grails.orm.hibernate.cfg.GrailsDomainBinder.bindCollectionSecondPass(GrailsDomainBinder.java:372)
at
org.grails.orm.hibernate.cfg.GrailsDomainBinder$GrailsCollectionSecondPass.doSecondPass(GrailsDomainBinder.java:3399)
at
org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1631)
at
org.hibernate.boot.internal.InFlightMetadataCollectorImpl.processSecondPasses(InFlightMetadataCollectorImpl.java:1599)
```
I suggest to do the following:
- Add a defensive null check against the propertyToSortBy and throw an
appropriate error.
- Add support for sorting by the properties of the relation.
**propertyToSortBy** is returned as null, as it is looking up property by
name.
https://github.com/grails/gorm-hibernate5/blob/62ba190ee385b99f8a4e551790506dbf235a000b/grails-datastore-gorm-hibernate5/src/main/groovy/org/grails/orm/hibernate/cfg/GrailsDomainBinder.java#L362
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