Rails: Omniauth - "The parameter app_id is required"

Question

I'm following this railscast tutorial to set up omniauth for facebook authentication on my rails project: http://railscasts.com/episodes/360-facebook-authentication?autoplay=true. I'm 4 minutes in and all I've done so far is bundle the gem `omniauth-facebook` and added, omniauth.rb ``` OmniAuth.config.logger = Rails.logger Rails.application.config.middleware.use OmniAuth::Builder do provider :facebook, ENV['my id here...'], ENV['my secret code here...'] end ``` and then when I go to `http://localhost:3000/auth/facebook` I get an error saying `The parameter app_id is required`.

Accepted Answer

Oh, now I see: you need to define environment variables to store your `facebook_app_id` and `facebook_secret`. You add them to your environment like this (assuming unix-like system):

Add this to the bottom of your `~/.bashrc` file (or equivalent):

```
export FACEBOOK_APP_ID='your_id_here'
export FACEBOOK_SECRET='your_secret_here'
```

Then open a new terminal to be sure they get loaded in the environment.

At last, in your `omniauth.rb` initializer you type exactly:

```
Rails.application.config.middleware.use OmniAuth::Builder do
  provider :facebook, ENV['FACEBOOK_APP_ID'], ENV['FACEBOOK_SECRET']
end
```

Read more about the topic here, for example.

You can also use dotenv gem to handle environment variables.

Rails: Omniauth - "The parameter app_id is required"

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