app/inputs/enum_input.rb

enum_input.rb

class EnumInput < Formtastic::Inputs::SelectInput

  def collection
    enum = @object.enums(@method.to_sym)
    choices = enum ? enum.select_options : []
  end

end

enum_input2.rb

class EnumInput < FormtasticBootstrap::Inputs::SelectInput

  def collection
    enum = @object.enums(@method.to_sym)
    choices = enum ? enum.select_options : []
  end

end