class ActiveAdmin::Inputs::FilterCheckBoxesInput

def choice_label(choice)
  ' ' + super
end

def choice_wrapping(html_options, &block)
  template.capture(&block)
end

def choices_group_wrapping(&block)
  template.capture(&block)
end

def hidden_field_for_all
  ""
end

def hidden_fields?
  false
end

def input_name
  "#{object_name}[#{association_primary_key || method}_in][]"
end

def selected_values
  @object.send("#{association_primary_key || method}_in") || []
end