Rails: constant in initializer

Question

I want to keep constants in initializer and use it in model like:

model:

class AssessmentProcedure < ActiveRecord::Base

  def default_values
    self.self_estimation_weight ||= PROCEDURES_CONFIG['self_estimation_weight']
    self.parent_estimation_weight ||= PROCEDURES_CONFIG['parent_estimation_weight']
  end

end

config/initializers/constants.rb

PROCEDURES_CONFIG = YAML.load_file("#{::Rails.root}/config/assessment_procedures.yml")

The problem is when I use it I get an exception:

NameError: uninitialized constant AssessmentProcedure::PROCEDURES_CONFIG

What did I miss? Thanks

you can use it in model PROCEDURES_CONFIG = YAML.load_file("#{::Rails.root}/config/assessment_procedures.yml") instead of initializers — Rajarshi Das
– Rajarshi Das, Commented Sep 3, 2014 at 10:00
@RajarshiDas I know, but it's a bad practice to keep constants in model — Pavel
– Pavel, Commented Sep 3, 2014 at 10:02
I defined constants in an initializer in a rails 3.2 project with syntax MENU_CONFIG = Rails.root.join("config", "menu.yml").open { |file| YAML::load(file) } and its working quite well. — irene
– irene, Commented Sep 3, 2014 at 10:03
replace PROCEDURES_CONFIG['self_estimation_weight'] on ::PROCEDURES_CONFIG['self_estimation_weight'] — nikolayp
– nikolayp, Commented Sep 3, 2014 at 10:06

dre-hh · Accepted Answer · 2014-09-03 10:12:08Z

2

try

self.self_estimation_weight ||= ::PROCEDURES_CONFIG['self_estimation_weight']

it will unscope the constant and use the global namespace

In Rail 4.2 there is a much cleaner way

# config/environments/production.rb
config.x.procedures_config.self_estimation_weight = 4711

See http://edgeguides.rubyonrails.org/4_2_release_notes.html about custom configuration options

answered Sep 3, 2014 at 10:12

dre-hh

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