Affects Version/s: 2.0-RC1
Fix Version/s: None
Grails reference documentation doesn't contain any documentation for "createAlias".
Rob has written a nice blog article which explains the usage for querying hasMany associations.
I hope this information could be added to Grails manual.
createAlias is mentioned in these Jira issues:
There seems to be several use cases where createAlias should be used.