class ActiveModelSerializers::Model

def self.human_attribute_name(attr, _options = {})

:nocov:
The following methods are needed to be minimally implemented for ActiveModel::Errors 
def self.human_attribute_name(attr, _options = {})
  attr
end

def self.lookup_ancestors 

def self.lookup_ancestors
  [self]
end

def cache_key

Defaults to the downcased model name and updated_at 
def cache_key
  attributes.fetch(:cache_key) { "#{self.class.name.downcase}/#{id}-#{updated_at.strftime('%Y%m%d%H%M%S%9N')}" }
end

def id

Defaults to the downcased model name. 
def id
  attributes.fetch(:id) { self.class.name.downcase }
end

def initialize(attributes = {}) 

def initialize(attributes = {})
  @attributes = attributes && attributes.symbolize_keys
  @errors = ActiveModel::Errors.new(self)
  super
end

def read_attribute_for_serialization(key) 

def read_attribute_for_serialization(key)
  if key == :id || key == 'id'
    attributes.fetch(key) { id }
  else
    attributes[key]
  end
end

def updated_at

Defaults to the time the serializer file was modified. 
def updated_at
  attributes.fetch(:updated_at) { File.mtime(__FILE__) }
end