class ActiveAdmin::Views::TableFor::Column

def initialize(*args, &block) 

def initialize(*args, &block)
  @options = args.extract_options!
  @title = args[0]
  html_classes = [:col]
  if @options.has_key?(:class)
    html_classes << @options.delete(:class)
  elsif @title.present?
    html_classes << "col-#{ActiveAdmin::Dependency.rails.parameterize(@title.to_s)}"
  end
  @html_class = html_classes.join(' ')
  @data = args[1] || args[0]
  @data = block if block
  @resource_class = args[2]
end

def pretty_title 

def pretty_title
  if @title.is_a? Symbol
    default = @title.to_s.titleize
    if @options[:i18n].respond_to? :human_attribute_name
      @title = @options[:i18n].human_attribute_name @title, default: default
    else
      default
    end
  else
    @title
  end
end

def sort_column_name 

def sort_column_name
  @data.is_a?(Symbol) ? @data.to_s : @title.to_s
end

def sort_key


# => Sort key will be 'login'
column('Username', sortable: 'login'){ @user.pretty_name }

sort the column on:
will not be sortable unless you pass a string to sortable to
If you pass a block to be rendered for this column, the column

column :username, sortable: 'other_column_to_sort_on'
to the sortable option:
You can set the sort key by passing a string or symbol

# => Sort key will be set to 'username'
column :username
Defaults to the column's method if its a symbol

Returns the key to be used for sorting this column
def sort_key
  # If boolean or nil, use the default sort key.
  if @options[:sortable] == true || @options[:sortable] == false
    @data.to_s
  elsif @options[:sortable].nil?
    sort_column_name
  else
    @options[:sortable].to_s
  end
end

def sortable? 

def sortable?
  if @options.has_key?(:sortable)
    !!@options[:sortable]
  elsif @resource_class
    @resource_class.column_names.include?(sort_column_name)
  else
    @title.present?
  end
end