CODEWITHSUNDEEP
ruby-on-railsheroku
Andrew Richards
Andrew Richards

Reputation: 95

How do I reference Heroko Config Variables in Rails App

So I've created a few variables to store API key and secrets in. But I don't understand how I'm supposed to reference those variables in my code. When I try to push up my code to Heroku it says that I have undefined constant variables. Which yes I do. So what do I have to do here?

Upvotes: 0

Views: 112

Answers (1)

max
max

Reputation: 102036

Heroku's config vars are exposed to your app’s code as environmental variables. In Ruby you can access env vars through the ENV hash. This is actually just a plain old hash.

You can either use the normal bracket accessors or Hash#key:

ENV['MY_SECRET_KEY']      # string / nil  
ENV.key('MY_SECRET_KEY')  # string / nil
ENV.key?('MY_SECRET_KEY') # true / false

You can also use Hash#fetch which lets you either raise an error if the key is missing or provide a default value:

ENV.fetch('MY_SECRET_KEY')             # raises a KeyError if the var is not set
ENV.fetch('MY_SECRET_KEY', 'abcd1234') # provides a default value

Raising an error can really help with troubleshooting as it will fail fast and tell you exactly where the problem is.

Upvotes: 3

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