[android-developers] to fill an object with return after POST

I did the below codes to log into my system

@Post("/api/v1/sessions.json")
User login(UserWrapper user);

With that I have to return my webservice
ender :status => 200,
:json => { :success => true,
:info => "Logged in",
:data => { :user => resource,
:auth_token => current_user.authentication_token } }

My doubt is how to catch the return from webservice and populate the User object?

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