Uninitialized Constant Foo
16 Oct 2009
I created this issue twice this week doing the same thing so perhaps this post will keep me from doing it again.
NameError: uninitialized constant Foo
The first time I had just installed a gem. We'll pretend the gem was called Foo. I wanted to try and couldn't seem to use it. The strange thing was that I could use the gem in irb but not in this script file. Here's my script, lets see if you see the problem right away:contents of foo.rb:
require 'rubygems' require 'foo' job = Foo::Job.new job.do_stuff(:now) puts job.result
It would error on line 4: job = Foo::Job.new Do you see the problem?
It is requiring 'foo' which is the name of the gem library but unfortunately for me and the hairs I pulled out of my head it is also the name of the file (foo.rb).
Renaming the file to foo_playground.rb fixed the issue. HEAD SLAP!