class ActiveAdmin::BatchActions::BatchActionForm

Build a BatchActionForm

def build(options = {}, &block) 

def build(options = {}, &block)
  options[:id] ||= "collection_selection"
  # Open a form with two hidden input fields:
  # batch_action        => name of the specific action called
  # batch_action_inputs => a JSON string of any requested confirmation values
  text_node form_tag active_admin_config.route_batch_action_path(params, url_options), id: options[:id]
  input name: :batch_action,        id: :batch_action,        type: :hidden
  input name: :batch_action_inputs, id: :batch_action_inputs, type: :hidden
  super(options)
end

def closing_form_tag 

def closing_form_tag
  '</form>'.html_safe
end

def to_s

Override the default to_s to include a closing form tag 
def to_s
  content + closing_form_tag
end