class ActiveAdmin::Scope

def initialize(name, method = nil, options = {}, &block)


# => Scope with dynamic title using the :published_today scope method
Scope.new ->{Date.today.strftime '%A'}, :published_today

# => Scope with name 'Published' using a block to scope
Scope.new('Published') { |articles| articles.where(:published => true) }

# => Scope with name 'Published' and scope method :public, optionally displaying the scope per the :if block
end
articles.where :published => true
Scope.new 'Published', :public, :if => proc { current_admin_user.can? :manage, resource_class } do |articles|

# => Scope with name 'Published' and scope method :public
Scope.new('Published', :public)

# => Scope with name 'Published' and scope method :published
Scope.new(:published)

Examples:

Create a Scope 
def initialize(name, method = nil, options = {}, &block)
  @name, @scope_method = name, method.try(:to_sym)
  if name.is_a? Proc
    raise "A string/symbol is required as the second argument if your label is a proc." unless method
    @id = method.to_s.gsub(' ', '').underscore
  else
    @scope_method ||= name.to_sym
    @id = name.to_s.gsub(' ', '').underscore
  end
  @scope_method               = nil        if @scope_method == :all
  @scope_method, @scope_block = nil, block if block_given?
  @show_count       = options[:show_count].nil? ? true : options[:show_count]
  @display_if_block = options[:if]      || proc{ true }
  @default_block    = options[:default] || proc{ false }
end

def name 

def name
  case @name
    when Proc   then @name.call.to_s
    when String then @name
    when Symbol then @name.to_s.titleize
    else             @name.to_s
  end
end