Odd issue with rails_admin configuration

event.rb

class Event < ActiveRecord::Base
  has_many :presentations
  has_many :speakers, :through => :presentations

  EVT_ACTIVE_STATUSES = %w(on_sale at_door)
  EVT_INACTIVE_STATUSES = %w(sold_out past)

...

  def status_enum
    EVT_ACTIVE_STATUSES + EVT_INACTIVE_STATUSES
  end


end

rails_admin.rb

  config.model Event do
    weight -4
    list do
      sort_by :occurs_on
      sort_reverse true
      field :occurs_on
      field :title
      field :status
      field :updated_at
    end
    edit do
      field :title
      field :updated_at do
        read_only true
      end
      field :subtitle
      field :occurs_on
      field :description
      field :regular_paypal
      field :special_paypal
      field :status
      field :in_advance_text
      field :location
      field :special_pricing
      field :is_special
      field :special_layout_name
      field :show_sponsors
      field :video_link
      field :photo_link
      field :speakers
      field :presentations
    end
  end