ruby

Ruby weird assignment behaviour

Is this a ruby bug? target_url_to_edit = target_url if target_url_to_edit.include?("http://") target_url_to_edit["http://"] = "" end logger.debug "target url is now #{target_url}" This returns target_url without http:// ...

more ruby way of doing project euler #2

I'm trying to learn Ruby, and am going through some of the Project Euler problems. I solved problem number two as such: def fib(n) return n if n < 2 vals = [0, 1] n.times do vals.push(vals[-1]+vals[-2]) end return vals.last end i = 1 s = 0 while((v = fib(i)) < 4_000_000) s+=v if v%2==0 i+=1 end puts s While that work...

Declaring an integer Range with step != 1 in Ruby

UPDATE 2: For posterity, this is how I've settled on doing it (thanks to Jorg's input): 100.step(2, -2) do |x| # my code end (Obviously there are plenty of ways to do this; but it sounds like this is the most "Ruby" way to do it; and that's exactly what I was after.) UPDATE: OK, so what I was looking for was step: (2..100).ste...

JS and Rails site wide announcements

Tried doing http://davidwparker.com/2008/09/17/site-wide-announcements-in-rails-using-jquery-jgrowl/ Am really bad with JS. Think I am messing up on the last part where it says "This code goes in your application.js file (somewhere in $(function){ //here })" Am I not suppose to do a link_to_function and create a function with this cod...

Why are my RSpec specs running twice?

I have the following RSpec (1.3.0) task defined in my Rakefile: require 'spec/rake/spectask' Spec::Rake::SpecTask.new(:spec) do |spec| spec.libs << 'lib' << 'spec' spec.spec_files = FileList['spec/**/*_spec.rb'] end I have the following in spec/spec_helper.rb: require 'rubygems' require 'spec' require 'spec/autorun' require 'rack...

Rails: How do I unserialize from database?

Hello, I am currently trying to save information for an invoice/bill. On the invoice I want to show what the total price is made up of. The procedures & items, their price and the qty. So in the end I hope to get it to look like this: Consult [date] [total_price] Procedure_name [price] [qty] Procedure_name [price] [qty] ...

Using rvm with a standalone ruby script

I have rvm installed on a Mac OS X 10.6 system with the system ruby and 1.9.1. I also have this basic ruby script: #!/usr/bin/ruby require 'curb-fu' I need the script to use the system ruby regardless of what rvm's using at any given time; I'm assuming that I've got that right, at least. I've switched to the system ruby (rvm use sys...

How to run Ruby on Rails on App Engine

There seems to be several technology demos such as http://rails-primer.appspot.com/ on how to run Rails on App Engine. What would be the easiest way to run Rails on App Engine? ...

LoadError in Ruby

I'm having issues requiring 'digest/sha1'. ~$ ./configure --prefix=$HOME/usr --program-suffix=19 --enable-shared ~$ make ~$ make install ~$ irb19 irb(main):001:0> require 'digest/sha1' LoadError: dlopen(/Users/matan/usr/lib/ruby19/1.9.1/i386-darwin9.8.0/digest/sha1.bundle, 9): Symbol not found: _rb_Digest_SHA1_Finish Referenced from: ...

How do I conditionally assign ruby variables to javascript variables?

I have a website where I need a javascript version of the "current user" object along with the ruby version. I have been assigning these variables doing something like this... Application Controller: def get_user begin @current_user = User.find(session[:user_id]) if session[:user_id] @current_user_json = @current_user.t...

Ruby: On what defining a class evaluates to

In Ruby, why does defining a class evaluate to nil? Same goes for defining a method: why does it evaluate to nil? Wouldn't it be useful if defining a class would evaluate as the class? ...

Can I make ruby send network traffic over a specific iface?

I am writing a script that grabs the external IP address along with some other information about each iface. I can't figure out how to make ruby send traffic over a specific iface(eth0 and wlan0 for example). I am currently using the open-uri library to open http://whatismyip.org and read it into a variable. def get_external_ip begin ...

Can I use RVM to maintain a single version of Ruby for all users?

I love RVM. I realize that the main use case for it is letting different users switch between different versions of Ruby. But let's say I'm deploying a Rails app to a server and I just want a single version of Ruby running. In particular, I want 1.9.2, which is a breeze to install with RVM but a pain without it. Is there a way that I can...

packaging jruby script into jar with all dependencies ?

is there any way to make my currently jruby script into a standalone single executable like jar or exe ? ...

What does it take to get the "LyricArtist" from this XML feed using Nokogiri?

First the xml: http://api.chartlyrics.com/apiv1.asmx//GetLyric?lyricId=90&amp;lyricCheckSum=9600c891e35f602eb6e1605fb7b5229e doc = Nokogiri::XML(open("http://api.chartlyrics.com/apiv1.asmx//GetLyric?lyricId=90&amp;lyricCheckSum=9600c891e35f602eb6e1605fb7b5229e")) Successfully will grab the document content. After this point i am unab...

Hash inside YAML file?

I want to include a hash and list inside a YAML file that I'm parsing with the following command: APP_CONFIG = YAML.load_file("#{RAILS_ROOT}/config/config.yml") My YAML file looks like this: feeds: [{:url => 'http://www.google.com', :label => 'default'}] But this doesn't seem to work. How would I go about achieving such a thing? T...

How do (or can I) hack a gem temporarily while looking for a bug?

I have a gem installed in my home directory on a laptop (eg not THE server). I have installed ruby 1.9.1 and also some other gems, notably right_aws - which allows access to s3, etc with ruby. All works, except there is a bug when I do a query on SimpleDB, and the returned list of items includes an item with any two byte utf-8 characte...

Rails advanced queries with join and sum calculation

I have two models: companies and expenses. Companies have many expenses and expenses belong to companies. My expense model has an 'amount' column. I was wondering if there is a way to perform a find based on a date range and the amount column of the expenses. Something like top 3 companies by total expense amounts over a 7 day period. ...

Storing information inside YAML

I looked through the YAML for ruby documentation and couldn't find an answer. I have a list of several employees. Each has a name, phone, and email as such: Employees: Name | Phone | Email john 111 [email protected] joe 123 [email protected] joan 321 [email protected] How would I write the above information in YAML to end up wit...

Getting can't modify frozen string when using string.insert

Hi, This is a quick question. I have the following ruby code, which works fine. def add_zeros number, zeros number = number.to_s zeros_to_add = zeros - number.length zeros_to_add.times do number = "0#{number}" end number end But if I replace number = "0#{number}" With number.insert(0, "0") Then I...