Question

I have been following the solution provided in a previous question:

Accessing config from application.rb in Controller (Rails 3)

but applying it for Facebook settings first.

I created the facebook config file first:

#lib/facebook_config.rb
module FacebookConfig
  def self.config
    @@config ||= {}
  end

  def self.config=(hash)
    @@config = hash
  end

end

and defined my YAML file then initialised it.

#config/facebook.yml
development:
  app_id = "id"
  app_secret = "secret"

test:
  app_id = "id"
  app_secret = "secret"

production:
  app_id = "id"
  app_secret = "secret"

and

#config/intializers/01.facebook_config.rb
require './lib/facebook_config'

FacebookConfig.config = YAML.load_file("config/facebook.yml")[Rails.env]

and defining the omniauth config as such:

#config/initializers/omniauth.rb
Rails.application.config.middleware.use OmniAuth::Builder do
  # The following is for facebook
  provider :facebook, FacebookConfig.config[:app_id], FacebookConfig.config[:app_secret], {:scope => 'email, read_stream, read_friendlists, friends_likes, friends_status, offline_access'}
end

however when I am testing in development mode I get the following error when starting up the webrick server:

config/initializers/omniauth.rb:3:in `[]’: can’t convert Symbol into Integer (TypeError)

I thought when accessing the config file it should be a String and not a Symbol?

Thanks for any tips.

Answer 1

Possible reason could be because of your facebook.yml file formatting.

You can read about Yaml here: http://en.wikipedia.org/wiki/YAML

Edited

I have tested your code in dummy app – same error, because, YAML file you have currently, will return string.

1.9.3p0 :014 > YAML.load_file("config/facebook.yml")[Rails.env]
 => "app_id = \"id\" app_secret = \"secret\""

So you can not access by symbol, because Ruby thinks that you are passing Numeric Index value for String.

Update your facebook.yml to this one (set your variables):

#config/facebook.yml
development:
  app_id: id
  app_secret: secret

test:
  app_id: id
  app_secret: secret

production:
  app_id: id
  app_secret: secret

After facebook.yml update, as result you will get hash:

YAML.load_file("config/facebook.yml")[Rails.env]
 => {"app_id"=>"id", "app_secret"=>"secret"}

Symbolize your config hash keys:

  def self.config=(hash)
    @@config = hash
    @@config.symbolize_keys!
  end

And it will work!