module ActiveAdmin::ResourceController::Filters::ClassMethods

def default_association_filters
  if resource_class.respond_to?(:reflections)
    resource_class.reflections.collect{|name, r| { :attribute => name }}
  else
    []
  end
end

def default_content_filters
  if resource_class.respond_to?(:content_columns)
    resource_class.content_columns.collect{|c| { :attribute => c.name.to_sym } }
  else
    []
  end
end

def default_filters_config
  default_association_filters + default_content_filters
end

def filter(attribute, options = {})
  return false if attribute.nil?
  @filters ||= []
  @filters << options.merge(:attribute => attribute)
end

def filters_config
  @filters && @filters.any? ? @filters : default_filters_config
end

def reset_filters!
  @filters = []
end