module JsonbAccessor::Helpers

def cast_nested_field_value(value, klass, method_name)
  case value
  when klass
    instance = klass.new(value.attributes)
  when Hash
    instance = klass.new(value)
  when nil
    instance = klass.new
  else
    raise UnknownValue, "unable to set value '#{value}' is not a hash, `nil`, or an instance of #{klass} in #{method_name}"
  end
  instance.parent = self
  instance
end