One to many relationship

Hi all,

I'm trying to start using Magritte building a small application.

I have a class SampleApplication who has a collection of MAUserRole
objects (the accessor is named #roles) and I'm trying to figure out
how to describe such attribute.

I've tried several combinations with no success.

One of my attempts was:
describeRoles
        ^ (MAOneToManyRelationDescription auto: 'roles' label: 'Roles' priority: 40)
                options: MAUserRole allInstances;
                yourself.

And I got:
MessageNotUnderstood: MAUserRole>>do:separatedBy:
    * MAUserRole(Object)>>doesNotUnderstand: #do:separatedBy:

What am I doing wrong?
Is there any documentation about how to describe different relationships?

Thanks in advance!
Pablo.-

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