rails/application: allow passing an env to config_for

[sirupsen]

Would make it easier to write tests to sanity check configuration files for other environments.

@rafaelfranca @byroot

[rails-bot]

Thanks for the pull request, and welcome! The Rails team is excited to review your changes, and you should hear from @carlosantoniodasilva (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

[byroot]

👍

[rafaelfranca]

hmmmm, I has hoping to use the second argument as a default value when the config file is not found but I guess I can still use the block version for that. See https://groups.google.com/d/msg/rubyonrails-core/3kCxt2wr8XM/80K_54f8DAAJ.

[byroot]

Or maybe it could be a named argument?

[sirupsen]

👍 to named argument if those are used in Rails core now.

[rafaelfranca]

Yes, they are.

[sirupsen]

Updated to use a named argument

[rafaelfranca]

❤️ 💚 💙 💛 💜