Create Routes with prefilters

[ludusrusso]

Hi,
I'm try to understand if there is a way to define a Route on a Resource equivalent to a filtered query.

Here is an example:

I've a reource ExampleResource that has a filed example, an i'd like to create a Get custom route '/example' that returns only the elements having example == True

    class ExampleResource(PrincipalResource):
        class Schema:
            author = fields.ToOne('user')

        class Meta:
            model = Code
            read_only_fields = ['author']
            permissions = {
                'create': 'yes',
                'read': 'user:author',
                'update': 'read',
                'delete': 'update'
            }

        @Route.GET
        def examples(self):
             # Return equivalent to filter example == True