module ActiveModel::AttributeAssignment

def _assign_attribute(k, v) 

def _assign_attribute(k, v)
  if respond_to?("#{k}=")
    public_send("#{k}=", v)
  else
    raise UnknownAttributeError.new(self, k)
  end
end

def _assign_attributes(attributes) 

def _assign_attributes(attributes)
  attributes.each do |k, v|
    _assign_attribute(k, v)
  end
end

def assign_attributes(new_attributes)

cat.status => 'sleeping'
cat.name # => 'Gorby'
cat.assign_attributes(status: "sleeping")
cat.status => 'yawning'
cat.name # => 'Gorby'
cat.assign_attributes(name: "Gorby", status: "yawning")
cat = Cat.new

end
attr_accessor :name, :status
include ActiveModel::AttributeAssignment
class Cat

exception is raised.
of this method is +false+ an ActiveModel::ForbiddenAttributesError
If the passed hash responds to permitted? method and the return value

keys matching the attribute names.
Allows you to set all the attributes by passing in a hash of attributes with 
def assign_attributes(new_attributes)
  if !new_attributes.respond_to?(:stringify_keys)
    raise ArgumentError, "When assigning attributes, you must pass a hash as an argument."
  end
  return if new_attributes.nil? || new_attributes.empty?
  attributes = new_attributes.stringify_keys
  _assign_attributes(sanitize_for_mass_assignment(attributes))
end