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HISTFILE warnings for Mongrel/Rails on OS X Leopard
Posted on 11/28 at 05:55 PM
While running a Rails app in Mongrel today, I noticed some application warnings in my logs. The following 2 lines would appear for every page request.
/etc/irbrc:14: warning: already initialized constant HISTFILE
/etc/irbrc:15: warning: already initialized constant MAXHISTSIZE
After doing some homework, I found a fix!
This link (discuss.joyent.com) offered a solution. Just create a file in ~/.irbrc with the following contents:
require 'irb/completion'
require 'irb/ext/save-history'
ARGV.concat [ "--readline", "--prompt-mode", "simple" ]
IRB.conf[:SAVE_HISTORY] = 100
IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-save-history"
... and then reboot your server. The warnings should disappear
5 Comments
I came here after a google search on “already initialized constant HISTFILE”. I had just upgraded to Leopard and started seeing them. After re-installing the mongrel gem, it went away. Go figure.
Oops didn’t fix the problem.
I can recommend this solution 100%, haven’t had problems since, let me know if you need help 
Works great, thanks a ton!
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Me again, I actually found a neat article recently I thought I might append to this post: my-irbrc. In addition to fixing the log warnings i described earlier, it also helps customize your console prompt to include your project name!!
require 'irb/completion'
require 'irb/ext/save-history'
IRB.conf[:SAVE_HISTORY] = 100
IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-save-history"
IRB.conf[:PROMPT_MODE] = :SIMPLE
# Just for Rails...
if rails_env = ENV['RAILS_ENV']
rails_root = File.basename(Dir.pwd)
IRB.conf[:PROMPT] ||= {}
IRB.conf[:PROMPT][:RAILS] = {
:PROMPT_I => "#{rails_root}> ",
:PROMPT_S => "#{rails_root}* ",
:PROMPT_C => "#{rails_root}? ",
:RETURN => "=> %s\n"
}
IRB.conf[:PROMPT_MODE] = :RAILS
# Called after the irb session is initialized and Rails has
# been loaded (props: Mike Clark).
IRB.conf[:IRB_RC] = Proc.new do
ActiveRecord::Base.logger = Logger.new(STDOUT)
ActiveRecord::Base.instance_eval { alias :[] :find }
end
end