nomethoderror for rack::utils::escape

Question

I'm new to rails so I apologize for my ignorance.

I'm setting a constant in a class outside of a method:

PARAM = { #... => ...
 'field' => escape('somethingwith/slashes')
}

and get a NoMethodError: undefined method 'escape'

I tried Rack::Utils::escape and Rack::Utils.escape instead, but both don't work.

Thanks in advance.

Answer 1

You can use CGI.escape.

# lib/my_foo
class MyFoo
 THINGS = {
 :hi => CGI.escape("well hello, there.")
 }
end

If yo do this outside of the Rails environment, you'll have to require "cgi" as well.

• user117046: gives me the same error. undefined method 'escape' for #<UsersController:0x4d403c4> any thoughts?
• Geo: you need to require "CGI" so that you can use the escape method.
• August Lilleaas: That is because you should use CGI.escape, not escape. Look closely at the snippet ;)
• user117046: The same error appears if I "require 'CGI'" or "require 'cgi'"
• August Lilleaas: CGI.escape works for me. The error you pasted above tells me that escape was called on an instance of UsersController, not on CGI. Double check your code

Answer 2

What version of Rails are you using. If you're using Rails 2.3, you should have Rack available. Check this out:

>> require "rack" # Rails 2.3 and above has already done this
=> true
>> Rack::Utils.escape("the quick brown fox")
=> "the+quick+brown+fox"

If you're using a version of Rails older than 2.3, you'll need to install and require Rack yourself.

sudo gem install rack

Or, if you're managing gems from inside Rails, add the following line to your environment.rb inside the Initializer block:

config.gem "rack", "1.0.0"

Once you upgrade to Rails 2.3 or higher, you'll be able to use the version of Rack built-in with Rails, and you can remove the config.gem line.