To send structured types across the wire, derive from ActionWebService::Struct, and use member to declare structure members.

ActionWebService::Struct should be used in method signatures when you want to accept or return structured types that have no Active Record model class representations, or you don’t want to expose your entire Active Record model to remote callers.

Example

class Person < ActionWebService::Struct
  member :id,         :int
  member :firstnames, [:string]
  member :lastname,   :string
  member :email,      :string
end
person = Person.new(:id => 5, :firstname => 'john', :lastname => 'doe')

Active Record model classes are already implicitly supported in method signatures.