Re: [rails-oceania] Controlling environment specific configuration (eg, database config) using environment variables

[Dave Perrett]

The 'app' gem (https://github.com/stephencelis/app) might be worth a 
look. We use it for environment-specific config - you define 
development.rb, staging.rb etc under config/app , and then you can use 
'App.some_environment_specific_variable' in your code.

For stuff like database or S3 credentials which we don't want to 
hard-code in config, you can use environment variables (for example) on 
production, but not development, eg:

config/app/production.rb
App.configure do
  config.paypal_api_username  = ENV['PAYPAL_USERNAME']
  config.paypal_api_password = ENV['PAYPAL_PASSWORD']
  config.paypal_api_signature = ENV['PAYPAL_SIGNATURE']
end

config/app/development.rb
App.configure do
  config.paypal_api_username  = 'test_user'
  config.paypal_api_password = 'test_ pass'
  config.paypal_api_signature = 'test_sig'
end

Then you can reference App.paypal_api_username in your code, and 
environment differences look after themselves. You'll still end up with 
ERB in your database.yml though, so this might not be what you're after.

Cheers


Mike Bailey <mailto:m...@bailey.net.au>
29 July 2012 3:48 PM
Thanks for posting example Michael.

When and how are you setting the environment variable?

- Mike

Sent from my iPhone

On 29/07/2012, at 11:55 AM, Michael Pearson <mipear...@gmail.com 
<mailto:mipear...@gmail.com>> wrote:

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Michael Pearson <mailto:mipear...@gmail.com>
29 July 2012 1:55 PM
Not what I meant - that's controlling individual the database 
connection of individual models. It could be used, I guess, to 
override the connection mechanism to use something other than 
database.yml, but that too seems inelegant (eg, it won't work with the 
Delayed Job implied model)

As an example, here's what I've got as an interim YAML / ERB based 
solution:

https://gist.github.com/3195668




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Mark Ratjens <mailto:m...@ratjens.com>
29 July 2012 1:43 PM
In the first Rails Recipes book by Chad Fowler, there's a recipe 
called Connecting to Multiple Databases. I seem to remember using 
something like it circa 2006, but can;t lay my hands on the code (it 
was in a private repo of a company that was eventually bought out).

Just a little snippet from the recipe to give some clues:

class External < ActiveRecord::Base

self.abstract_class = true establish_connection :products

end

class Product < External

end

class TaxConversion < External

end






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Michael Pearson <mailto:mipear...@gmail.com>
29 July 2012 1:28 PM
Hi,

Lincoln Stoll recently gave a presentation about the 12 Factor App at 
DevOps Melbourne. One of the take-homes from that presentation for me 
was the idea of using URIs in environment variables to configure 
environment-specific (vs app specific) parts of the application: 
http://www.12factor.net/config

For instance, it'd be nice if I could have on my system:

DATABASE_URI=mysql://foo:bar@localhost/myDatabase

And then keep application specific database config (eg, my locale) to 
the database.yml.

I'm wondering if anybody has implemented this already in a gem, or a 
gist, or similar. It's relatively trivial to use ERB to do this in 
your database.yml right now, but seems inelegant.

Also, I hate ERB. Just putting that out there.

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Michael Pearson


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