This method is deprecated or moved on the latest stable version.
The last existing version (v3.2.13) is shown here.
schema()
public
If no schema has been
defined for the class (see ActiveResource::schema=), the default
automatic schema is
generated from the current instance’s attributes
# File activeresource/lib/active_resource/base.rb, line 979
def schema
self.class.schema || self.attributes
end