class ActiveAdmin::BatchAction

sort operator

def <=>(other)
  self.priority <=> other.priority
end

a default block always returning true will be returned.
Returns the display if block. If the block was not explicitly defined

def display_if_block
  @options[:if] || proc { true }
end

=> You can provide an optional :if proc to optionally display the batch action
BatchAction.new( :flag, :if => proc { can? :flag, AdminUser } ) { |selection| }

=> You can create batch actions with a title instead of a Symbol
BatchAction.new( "Perform Long Operation on the" ) { |selection| }

=> Will create an action that uses a block to process the request (which receives one paramater of the selected objects)
BatchAction.new( :flag ) { |selection| redirect_to collection_path, :notice => "#{selection.length} users flagged" }

=> Will create an action that appears in the action list popover
BatchAction.new :flag

Examples:

Create a Batch Action

def initialize(sym, title, options = {}, &block)
  @sym, @title, @options, @block, @confirm = sym, title, options, block, options[:confirm]
  @block ||= proc {}
end

Used for sorting

def priority
  @options[:priority] || 10
end