def update(class_or_classname, record_id, new_attrs)
      class_or_classname = find_or_materialize(class_or_classname)
      json_for_update = coerced_json(new_attrs, class_or_classname)
      http_patch("/services/data/v#{self.version}/sobjects/#{class_or_classname.sobject_name}/#{record_id}", json_for_update)
    end
def update(class_or_classname, record_id, new_attrs)
      class_or_classname = find_or_materialize(class_or_classname)
      json_for_update = coerced_json(new_attrs, class_or_classname)
      http_patch("/services/data/v#{self.version}/sobjects/#{class_or_classname.sobject_name}/#{record_id}", json_for_update)
    end
Updates the attributes of the record of type _class_or_classname_ and specified by _record_id_ with the values of _new_attrs_ in the Force.com database. _new_attrs_ is a hash of attribute => value

    client.update("Car", "rid", {"Color" => "Red"})