Oribow opened a new issue, #14374:
URL: https://github.com/apache/grails-core/issues/14374
I have a domain object with a collection of non-domain objects.
```
class Person{
static hasMany = [knownContacts: KnownContacts]
}
enum KnownContacts{
None,
Email,
Phone
}
```
I want to use this "association" in a criteria, but that throws a
`groovy.lang.MissingMethodException: No signature of method` error at
`knownContacts { ... }`.
```
{
projections {
knownContacts {
id()
}
}
}
```
This is because gorm treats the "knownContacts" not as an association, but
as an ELEMENT_COLLECTION.
Which means the isAssociation check fails on it, as its
PersistentAttributeType is ELEMENT_COLLECTION.
```
public boolean isAssociation() {
return getPersistentAttributeType() ==
PersistentAttributeType.ONE_TO_MANY
|| getPersistentAttributeType() ==
PersistentAttributeType.MANY_TO_MANY;
}
```
There doesn't seem to be any code in
AbstractHibernateCriteriaBuilder.invokeMethod that deals with
ELEMENT_COLLECTIONs.
```
if (pd != null && pd.getReadMethod() != null) {
final Metamodel metamodel = sessionFactory.getMetamodel();
final EntityType<?> entityType =
metamodel.entity(targetClass);
final Attribute<?, ?> attribute =
entityType.getAttribute(name);
if (attribute.isAssociation())
[...]
```
The `attribute.isAssociation` check fails and the `throw new
MissingMethodException(name, getClass(), args);` at the end of the method is
reached.
I'm not sure if this is intentional or an oversight. Is there a different
way we are supposed to query non domain to domain associations?
The generated database schema creates an extra table for ELEMENT_COLLECTION
(at least in this case) so I'm not sure why they can't be used like regular
associations between domain objects.
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