Yelp ruby gem on Heroku - ruby-on-rails

Question

I have this code as an initializer in yelp.rb:
Yelp.client.configure do |config|
config.consumer_key = ENV['config.consumer_key']
config.consumer_secret = ENV['config.consumer_secret']
config.token = ENV['config.token']
config.token_secret = ENV['config.token_secret']
end
I have a yelp.yml file that loads all this in and it works great in development.
As soon as I push it to heroku (I have all my keys set in Heroku as well and have triple verified no spelling errors) I get this error 'Yelp::Error::MissingAPIKeys: You're missing an API key'
I've ran code in Rails C on development (see below) and it passes, ran the exact same code in Rails c on the Heroku side and I get that error. I even tried it without using ENV and used the exact api keys and same error.
client = Yelp::Client.new({
consumer_key = ENV['config.consumer_key'],
consumer_secret = ENV['config.consumer_secret'],
token = ENV['config.token'],
token_secret = ENV['config.token_secret'] })
What is different between Production and Development?
UPDATE:
Got it working...
I was able to get it working this way...
def index
current_user.zip_code.present? ? #zip = current_user.zip_code : #zip = "94101"
parameters = { term: 'auto repair', limit: 9 }
#search = client.search(#zip, parameters)
end
private
def client
#client ||= Yelp::Client.new({ consumer_key: ENV['config.consumer_key'],
consumer_secret: ENV['config.consumer_secret'],
token: ENV['config.token'],
token_secret: ENV['config.token_secret']
})
end

Answer 1

Run heroku config --app app-name to check if config variables are being set correctly, if that looks correct. Then try running rails console on Heroku using heroku run rails console --app app-name to check if the Yelp::Client is loading the env properly.
If you just follow the ENV naming convention as provided in the gem readme you might avoid this issue altogether.
Yelp.client.configure do |config|
config.consumer_key = YOUR_CONSUMER_KEY
config.consumer_secret = YOUR_CONSUMER_SECRET
config.token = YOUR_TOKEN
config.token_secret = YOUR_TOKEN_SECRET
end