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Asked: 2026-06-15T21:18:02+00:00

I want to build a rails3 website authed with LDAP, so I chose ruby-ldap

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I want to build a rails3 website authed with LDAP, so I chose ruby-ldap gem (not net/ldap) which we used in our old rails2 apps and works very well.

But I keep on getting weird error in rails3 app, See the codes below: 

require 'ldap'
class WelcomeController < ApplicationController

  def index  
    begin
      @test = LDAP::Conn.new('10.72.64.11', 389)
    rescue LDAP::Error
      p LDAP::Error
    end  
    render :text => "ok"
  end
end

welcome#index is my root route. Most time, the app crashes when going to LDAP::Conn.new(‘10.72.64.11’, 389), even I tried to use “pry” to debug and track, throwing 

[1]    24797 trace trap  rails s

and the WEBrick server will be terminated right that time.

Sometimes it throws another type error when I use “pry” to step,
#<NameError: uninitialized constant WelcomeController::LDAP>

While try it in the console, everything goes well.

1.9.3-p194 :001 > require 'ldap'
 => true 
1.9.3-p194 :002 > @test = LDAP::Conn.new('10.72.64.11', 389)
 => #<LDAP::Conn:0x00000101289568> 
1.9.3-p194 :003 >

Can you guide me out of this crazy stuff? I am using ruby 1.9.3p194 and rails 3.2.8

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1 Answer

  1. Editorial Team

    A few months later, I kind of figure out what the problem is…

    The ruby-ldap gem has problem on running on the rails default server: Webrick.

    Try Pow or Passenger, it works perfect!

    After reading this page: http://www.ruby-forum.com/topic/62920

    I tried moving the require ‘ldap’ from the controller or model file, and into the very top line of my environment file (xxxlocal.rb)

    After I did that, I was able to run it ok in webrick also.

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