Start Rails console or server with debugger

When you require the Ruby debugger to be available from your Rails console (e.g. you want to inspect a method's magic), you need to enable it explicitly:
script/console --debugger

If you cannot access local variables etc, see this card.

WEBrick

For WEBrick, enable it similarly:
script/server --debugger

Arne Hartherz

makandra.com

Say thanks1

Last edit

11 years ago

License

Source code in this card is licensed under the MIT License.

Use non-ASCII characters on IRB and Rails consoles with RVM and Mac OS X

If you are using RVM on a Mac and cannot enter 8+ bit characters on an IRB or Rails console, you are missing the readline package. You will need to re-install your Ruby to fix this:

rvm remove ree
rvm package install readline
rvm in...

Ruby: How to measure code execution time in an IRB or Rails console

Modern IRB has time measurement built in.

measure # Enable
measure :off # Disable

Custom

Should your version of IRB not offer this feature, you can measure manually. Paste this method into your console:

def time(&block) puts Bench...

Howto respond html or json in the same controller action with Rails 2

Code snippet tested with Rails 2.3

  def index
    # ...
    if request.xhr?
      html = render_to_string(:partial => "list", :layout => false)
      respond_to do |format|
        format.html { render :text => html }
        format.json {...

Persist Rails or IRB Console Command History After Exit

Create, or edit your ~/.irbrc file to include:

require 'irb/ext/eval_history' # was 'irb/ext/save-history' for versions prior to Ruby 3.3
IRB.conf[:SAVE_HISTORY] = 2000
IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-history"

Posted by Arne Hartherz to makandra dev (2011-10-07 18:03)

Start Rails console or server with debugger

WEBrick

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