Rails.env undefined in Rails 2

Question

I have an older application running Ruby on Rails 2.2, and I'm having trouble getting a gem to work because it can't find the current environment with Rails.env:

$ script/console
>> Rails.env
NoMethodError: undefined method `env' for Rails:Module
from (irb):1

The gem is set up to use Rails.env when Rails is defined, and RAILS_ENV when it's not. But I seem to have a Rails object without an env method (even though I read that method was added in Rails 2). Any idea what's going on?

I don't have 2.2 installed (2.3.8 has that method), but you can look @ what methods are available by running this in the console: puts Rails.methods.sort. — Brian
– Brian, Commented Dec 10, 2010 at 17:58

iain · Accepted Answer · 2010-12-10 19:08:07Z

4

Rails.env was introduced in Rails 2.3. You probably want to upgrade to Rails 2.3 if possible.

Otherwise, try this in a config/initializers/rails_env.rb:

require 'active_support/string_inquirer'
def Rails.env
  @_env ||= ActiveSupport::StringInquirer.new(ENV["RAILS_ENV"] || ENV["RACK_ENV"] || "development")
end

answered Dec 10, 2010 at 19:08

iain

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2 Comments

jrdioko Over a year ago

Thanks! But no ActiveSupport::StringInquirer on my system. I suppose I could make it a straight string?

iain Over a year ago

You can try that, depends on the gem you are using. If it does Rails.env.production? then you need the StringInquirer. In that case, you can backport it: github.com/rails/rails/blob/master/activesupport/lib/…

ryeguy · Accepted Answer · 2010-12-16 20:50:16Z

2

The Rails module has always been in rails. It is not new in 3, so checking to see if it's defined is the wrong way to go about things. The correct way to determine if you can use Rails.env is to do Rails.respond_to? :env.

edited Dec 16, 2010 at 20:50

answered Dec 10, 2010 at 17:58

ryeguy

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4 Comments

jrdioko Over a year ago

Thanks! I'll pass that along to the gem maintainer. In the meantime, what makes most sense as a workaround? Is there any harm in defining Rails.env to be RAILS_ENV?

ryeguy Over a year ago

@jrdioko For 2.x compatability you could do that, but it's not a good idea to always just use RAILS_ENV as it is deprecated in 3.

jrdioko Over a year ago

Rails.method_defined?(:env) returns false even on Rails 3.

jrdioko Over a year ago

I think it should be Rails.respond_to?(:env).

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