gistfile1.js

// core.ssbe.localhost/clients/legacy_client
{
  "_type":       "Client",
  "href":        "http://core.ssbe.localhost/clients/legacy_client",
  "id":          "cecbab41-59cb-46fc-89e6-7d49ec60ccbe",
  "name":        "legacy_client",
  "parent_href": "http://core.ssbe.localhost/clients/API",
  "hosts_href":  "http://core.ssbe.localhost/clients/legacy_client/hosts"
}

// core.ssbe.localhost/clients/legacy_client/hosts
{
  "href"      : "http://core.ssbe.localhost/clients/legacy_client/hosts",
  "item_count": 1,
  "items"     : [
{
  "_type"       : "Host",
  "id"          : "a5ef5493-4780-4874-bd2f-39048bfe11e6",
  "href"        : "http://core.ssbe.localhost/hosts/1",
  "name"        : "legacy_hostname",
  "client_href" : "http://core.ssbe.localhost/clients/legacy_client"
}
  ]
}

gistfile2.rb

class Client
  include DataMapper::Resource
  
  # ...
  property :hosts_href, String
  # ...

  has n, :hosts
end

class Host
  include DataMapper::Resource

  # ...
  # property :client_href
  # ...

  belongs_to :client
end

client = Client.get('http://core.ssbe.localhost/clients/legacy_client')
client.hosts  #=> [<#Host ...>, ...]