class Grape::Validations::ParamsScope::Attr

def self.attr_key(declared_param_attr)
  return attr_key(declared_param_attr.key) if declared_param_attr.is_a?(self)
  if declared_param_attr.is_a?(Hash)
    declared_param_attr.transform_values { |value| attrs_keys(value) }
  else
    declared_param_attr
  end
end

def self.attrs_keys(declared_params)
  declared_params.map do |declared_param_attr|
    attr_key(declared_param_attr)
  end
end

def initialize(key, scope)
  @key = key
  @scope = scope
end