irb

If I define a method in IRB, is there any way to review its source later in the session? > def my_method > puts "hi" > end Several screens of output later I'd like to be able to write something like > source my_method and get back: => def my_method; puts "hi"; end; Is this possible? Serabe Try pry . There is a railscast about it (released this same week!) and it shows you how to show the code by using show-method . Not in IRB but in Pry this feature is built-in. Behold: pry(main)> def hello pry(main)* puts "hello my friend, it's a strange world we live in" pry(main)* puts "yes! the rich give

I am building an application which subclasses Sinatra like so: require 'rubygems' require 'sinatra/base' require 'sinatra/assetpack' class App < Sinatra::Base ... run! end How can I access irb? Options are not parsed when executing sinatra this way, how do I programmatically open an irb shell? I'm a little confused whether you want to open an IRB session from within your app (?) or use IRB to debug your Sinatra project? For debugging Rack-based apps (such as Sinatra), I like using the racksh gem , which " is like script/console in Rails " for Rack applications. Its main advantage over IRB is

So I have this ruby code I grabbed from wikipedia and I modified a bit: @trie = Hash.new() def build(str) node = @trie str.each_char { |ch| cur = ch prev_node = node node = node[cur] if node == nil prev_node[cur] = Hash.new() node = prev_node[cur] end } end build('dogs') puts @trie.inspect I first ran this on console irb, and each time I output node , it just keeps giving me an empty hash each time {} , but when I actually invoke that function build with parameter 'dogs' string, it actually does work, and outputs {"d"=>{"o"=>{"g"=>{"s"=>{}}}}} , which is totally correct. This is probably more

When I go into irb and type in a command that does not exist I get an error stating "undefined local variable or method 'my_method' for main:Object (NameError)" Is there a way to just get a list of what local variables or methods ARE available? This would be really useful for exploring ruby. Zabba Look for methods in the Kernel, Object and Module : e.g. local_variables , instance_methods , instance_variables . Other great methods in there. inspect is another one. Great answers. As you explore, you have these at your disposal: obj.private_methods obj.public_methods obj.protected_methods obj

How can I execute a image_tag method in a Rails console Run the console $ rails c Load helpers include ActionView::Helpers Execute the command image_tag('test.png') I got a strange error. Please help! Not sure why you're getting that error. It is strange. But the Rails Console exposes the helper methods through the helper variable. So this should work: helper.image_tag('test.png') OK... I found the solution. The error is showing only in Rails 3 but I fixed it by setting the config.action_controller.asset_host = "http://..." config.action_mailer.asset_host = "http://..." in my environemnt file