Error referencing module constants as a :default in an ActiveRecord::Migration

Question

I am trying to set a default value on an attribute by pointing to a Module constant, but things are not going to plan. Relevant code includes:

[lib/establishments.rb]
module Establishments
  BAR = "Bar"
  RESTAURANT = "Restaurant"
  BENEFIT = "Benefit"
end

[20140321164012_add_type_to_discount]
include Establishments
class AddTypeToDiscount < ActiveRecord::Migration

  def change
    add_column :discounts, :type, :string, :default => Establishments::RESTAURANT
  end
end

rake db:migrate

Above code results in:

rake aborted!
An error has occurred, this and all later migrations canceled:

uninitialized constant Establishments/home/bob/Dev/app/db/migrate/20140321164012_add_type_to_discount.rb:1:in `<top (required)>'

Looks to me that the /lib path is not being picked up by rake. I'm not sure how to influence that.

I have also tried adding:

require 'lib/establishments.rb'

To the top of the migration file, but that complains of no such file.

score 2 · Accepted Answer · answered Mar 21 '14 at 17:25

2

Try with:

require "#{Rails.root}/lib/establishments"

Then you are able to use Establishments::RESTAURANT

answered Mar 21 '14 at 17:25

markets

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score 1 · Answer 2 · answered Mar 21 '14 at 17:25

1

Use require_relative '../../lib/establishments' instead of include Establishments

answered Mar 21 '14 at 17:25

Kirti Thorat

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score 1 · Answer 3 · answered Mar 21 '14 at 17:29

1

Thanks for the answers, all valid - just as I found (equally valid)

require File.expand_path('lib/establishments')

answered Mar 21 '14 at 17:29

jenson-button-event

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ah yes but who gets the answer vote - i am literally going to toss a coin :) – jenson-button-event Mar 21 '14 at 17:31
Hahaha.:) If I may suggest, choose markets, he was 4 secs faster than me. – Kirti Thorat Mar 21 '14 at 17:34
Well, he deserved it :) – Kirti Thorat Mar 21 '14 at 17:35
@KirtiThorat I found this with more options: http://stackoverflow.com/questions/4333286/ruby-require-vs-require-relative-best-practice-to-workaround-running-in-both. – markets Mar 21 '14 at 19:16

Error referencing module constants as a :default in an ActiveRecord::Migration

3 Answers3