class ActiveModelSerializers::Adapter::JsonApi

def attributes_for(serializer, fields)

}
foo: 'bar'
{
structure:
Attributes may contain any valid JSON value
object in which it's defined.
Members of the attributes object ("attributes") represent information about the resource
description:

^(?!relationships$|links$)\\w[-\\w_]*$
patternProperties:

JSON Object
definition:
attributes
{http://jsonapi.org/format/#document-resource-object-attributes Document Resource Object Attributes} 
def attributes_for(serializer, fields)
  serializer.attributes(fields).except(:id)
end