CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3
Jatin Ganhotra
Jatin Ganhotra

Reputation: 7035

Problem with constants

In my app, I have many constants, so I made a constants file named det_constants.yml for these constants.

/config/det_constants.yml

DEFAULTS: &DEFAULTS
    company_type:  { "Private"                     : 1,
                     "Public"                      : 2  }
development:
  <<: *DEFAULTS

test:
  <<: *DEFAULTS

production:
  <<: *DEFAULTS

I have a constants.rb file in lib folder, which loads this constant file.

/lib/constants.rb

module Constants
  # Allows accessing config variables from det_constants.yml like so:
  # Constants[:abc] => xyz
  def self.[](key)
    unless @config
      raw_config = File.read(Rails.root.to_s + "/config/det_constants.yml")
      @config = YAML.load(raw_config)[Rails.env].symbolize_keys
    end
    @config[key]
  end

  def self.[]=(key, value)
    @config[key.to_sym] = value
  end
end

In my view file, when I do

<%= Constants[:company_type] %>

it throws an error

 NameError in Vendors#index 
uninitialized constant ActionView::CompiledTemplates::Constants

at line

<%= Constants[:company_type] %>

However, If i do the same thing in console, it runs properly,

ruby-1.9.2-head > Constants[:company_type]
 => {"Private"=>1, "Public"=>2}

I don't know where is the problem. if there is a new and better way to do this in Rails 3, please let me know.

Ruby version: ruby 1.9.2p110 (2010-12-20 revision 30269) [i686-linux]
Rails version: Rails 3.0.3

Upvotes: 0

Views: 731

Answers (2)

Simon Perepelitsa
Simon Perepelitsa

Reputation: 20639

What about other solutions, I recommend you watch the railscast called YAML Configuration File. There are also some gems such as Settingslogic to help you with that.

Upvotes: 0

DigitalRoss
DigitalRoss

Reputation: 146073

I imagine you need:

<% require 'constants' %>

Also, you will need to restart the server following changes in lib/; it doesn't catch them automatically even in development mode.

Upvotes: 1

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