module ActiveAdmin::Resource::Attributes

def counter_cache_col?(c)
  c.name.end_with?("_count")
end

def default_attributes
  resource_class.columns.each_with_object({}) do |c, attrs|
    unless reject_col?(c)
      name = c.name.to_sym
      attrs[name] = (method_for_column(name) || name)
    end
  end
end

def filtered_col?(c)
  ActiveAdmin.application.filter_attributes.include?(c.name.to_sym)
end

def foreign_methods
  @foreign_methods ||= resource_class.reflect_on_all_associations.
    select { |r| r.macro == :belongs_to }.
    reject { |r| r.chain.length > 2 && !r.options[:polymorphic] }.
    index_by { |r| r.foreign_key.to_sym }
end

def method_for_column(c)
  resource_class.respond_to?(:reflect_on_all_associations) && foreign_methods.has_key?(c) && foreign_methods[c].name.to_sym
end

def primary_col?(c)
  c.name == resource_class.primary_key
end

def reject_col?(c)
  primary_col?(c) || sti_col?(c) || counter_cache_col?(c) || filtered_col?(c)
end

def sti_col?(c)
  c.name == resource_class.inheritance_column
end