module ActiveAdmin::Resource::Scopes

def default_scope(context = nil)
  scopes.detect do |scope|
    if scope.default_block.is_a?(Proc)
      render_in_context(context, scope.default_block)
    else
      scope.default_block
    end
  end
end

def get_scope_by_id(id)
  id = id.to_s
  scopes.find { |s| s.id == id }
end

def scope(*args, &block)
  default_options = { show_count: namespace.scopes_show_count }
  options = default_options.merge(args.extract_options!)
  title = args[0] rescue nil
  method = args[1] rescue nil
  options[:localizer] ||= ActiveAdmin::Localizers.resource(self)
  scope = ActiveAdmin::Scope.new(title, method, options, &block)
  # Finds and replaces a scope by the same name if it already exists
  existing_scope_index = scopes.index { |existing_scope| existing_scope.id == scope.id }
  if existing_scope_index
    scopes.delete_at(existing_scope_index)
    scopes.insert(existing_scope_index, scope)
  else
    self.scopes << scope
  end
  scope
end

def scopes
  @scopes ||= []
end