def get_operating_system_families(uri)
compute_pool_id = id_from_uri(uri)
compute_pool = self.data[:compute_pools][compute_pool_id]
operating_system_families = self.data[:operating_system_families].values.select{|osf| osf[:compute_pool_id] == compute_pool_id}
operating_system_families = operating_system_families.map{|osf| Fog::Ecloud.slice(osf, :id, :compute_pool_id)}.map{|osf| osf[:OperatingSystemFamily]}
operating_system_family_response = {:OperatingSystemFamily => (operating_system_families.size > 1 ? operating_system_families : operating_system_families.first)}
body = {
:href => uri,
:type => "application/vnd.tmrk.cloud.operatingSystemFamily; type=collection",
:Links => {
:Link => compute_pool,
}
}.merge(operating_system_family_response)
response(:body => body)
end