Thank you Jeremy.
I currently have this, which appears to work:
def etag
digest(_models.map(&:id).zip(_models.map(&:lock_version)).join)
end
def last_modified
_models.map(&:updated_at).max
end
private
def digest(string)
Digest::SHA1.hexdigest(string)
end
def _models
[
collection,
*collection.items,
*collection.resources,
*collection.resources.compact.map(&:original),
*collection.resources.map(&:original).compact.map(&:proxies)
].compact.uniq
end
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