Content links missing when using Spring Data REST projections

[tgeens]

When using projections with the @Projection annotation in Spring Data REST, the content association in the HATEAOS _links section is missing.

That is because Spring Content looks for fields annotated with @ContentId to generate the link in ContentLinksResourceProcessor.

But projections have no fields, only methods. Putting the @ContentId annotation on a String getContentId() method in the projection interface does not help.

I think this could be resolved by not only considering the fields, but also looking at the propertyDescriptor.getReadMethod() when checking if the @ContentId annotation is present.

Pseudo code:

var propertyDescriptor = new BeanWrapperImpl(object).getPropertyDescriptors()[index];
if (AnnotationUtils.findAnnotation(propertyDescriptor.getReadMethod(), ContentId.class) != null) {
    ...
}

@paulcwarren would you consider such a change ?

[paulcwarren]

We are missing a test case in this area. Hence, this has snuck through.

But absolutely @tgeens. From what you describe that sounds like a reasonable fix to me.