Action Web Service supports the following base types in a signature:

:int

Represents an integer value, will be cast to an integer using Integer(value)

:string

Represents a string value, will be cast to an string using the to_s method on an object

:base64

Represents a Base 64 value, will contain the binary bytes of a Base 64 value sent by the caller

:bool

Represents a boolean value, whatever is passed will be cast to boolean (true, ‘1’, ‘true’, ‘y’, ‘yes’ are taken to represent true; false, ‘0’, ‘false’, ‘n’, ‘no’ and nil represent false)

:float

Represents a floating point value, will be cast to a float using Float(value)

:time

Represents a timestamp, will be cast to a Time object

:datetime

Represents a timestamp, will be cast to a DateTime object

:date

Represents a date, will be cast to a Date object

For structured types, you’ll need to pass in the Class objects of ActionWebService::Struct and ActiveRecord::Base derivatives.