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• simplest way to check for just spaces in ruby

  - by user301752

  So I know in ruby that x.nil? will test if x is null. What is the simplest way to test if x equals ' ', or ' ', or ' ', etc? Basically, I'm wondering what the best way to test if a variable is all whitespace?

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• Count the number of lines in a file with Ruby, without reading entire file into memory

  - by smnirven

  I'm processing huge data files (millions of lines each). Before I start processing I'd like to get a count of the number of lines in the file, so I can then indicate how far along the processing is. I am using Ruby, and because of the size of the files, it would not be practical to read the entire file into memory just to count how many lines there are. Does anyone have a good suggestion on how to do this?

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• Ruby weird assignment behaviour

  - by jaycode

  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://

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• Ruby character encoding issue

  - by Roland Soós

  Hi, I write a little ruby script, which sends me an email when a new commit added to our svn. I get the log with this code: log = `/usr/bin/svnlook log #{ARGV[0]}` When I run my script from bash I get good encoded character in the email, but when I try it and create a new commit I get wrong hungarian characters. I commited this: tes oéá I get this in the email: Log: tes ?\197?\145?\195?\169?\195?\161 How can I solve this issue?

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• Logging a certain event only once in ruby

  - by Andrew Grimm

  Are there any logging frameworks in ruby that allow you to log a specific event type only once? logger = IdealLogger.new logger.log(:happy_path, "We reached the happy path") # => logs this message logger.log(:happy_path, "We reached the happy path yet again") # => Doesn't log this logger.log(:sad_path, "We've encountered a sad path!") # => logs this message Also, is there a term for the concept of logging a certain event type only once?

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• Way to partialy match a Ruby string using Regexp

  - by Fabiano PS

  I'm working on 2 cases: assume I have those var: a = "hello" b = "hello-SP" b = "not_hello" 1 - Any partial matches I want to accept any string that has the var a inside, so b and c would match. 2 - Patterned match I want to match a string that has a inside, followed by '-', so b would match, c does not. I am having problem, because I always used the syntax /expression/ to define Regexp, so how dinamicaly define an RegExp on Ruby??

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• Checking deployed port in ruby on rails application

  - by john chan

  Is there an elegant way to check which port you deployed a ruby on rails application using mongrel? I could not find a directive (i.e. such as #{RAILS_ROOT} which contains the root directory of the application) that I can use to perform a check. I need this to do a check since I am deploying the same application on different ports and I need the app to do different things according to the port that is being accessed. Any help would be appreciated, Thanks

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• Execute ruby code in a link in Haml

  - by thermans

  I want to have a "delete user" link in a normal Activerecord table, but I can't figure out how to wrangle the inline ruby in haml. I have this: %tbody - @users.each do |user| %tr %td= user.name %td= user.login %td %a %img{:src => '../images/delete.png', :title => 'Delete user'} How do I make the - user.destroy be a clickable link in Haml?

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• Ruby bindings for Qt gui application.

  - by exvion

  How to create a Qt GUI applications with the ability to access it from the ruby script. Example: require 'myQt' myapp=myQt.new myapp.startQtGuiApp myapp.setValue('TextField1',45) value=myapp.getValue('TextField2')

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• How to generate Ruby documentation using different template?

  - by htanata

  I want to generate the Ruby documentation with hanna template. How to do that? Or where can I download it if it's available at all? Using rdoc -o ~/doc --inline-source --line-numbers --format=html --template=hanna gives me docs with missing methods. It seems like it doesn't generate methods written in C.

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• Ruby: Alter class static method in a code block

  - by Phuong Nguy?n

  Given the Thread class with it current method. Now inside a test, I want to do this: def test_alter_current_thread Thread.current = a_stubbed_method # do something that involve the work of Thread.current Thread.current = default_thread_current end Basically, I want to alter the method of a class inside a test method and recover it after that. I know it sound complex for another language, like Java & C# (in Java, only powerful mock framework can do it). But it's ruby and I hope such nasty stuff would be available

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• Nasty things user supplied ruby code in server can do

  - by nijikunai

  I'd like to run user supplied ruby code in server, what are the potentially nasty things that can happen? I mean things like deleting files etc. Can you give me more examples? Thanks in advance!

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• How to validate SSL certificate chain in ruby with net/http

  - by maledictus

  How can I verify the certificates of a site like https://processing.ukash.com/ in ruby with net/http? https = Net::HTTP.new('processing.ukash.com', 443) https.use_ssl = true https.verify_mode = OpenSSL::SSL::VERIFY_NONE Works so far, but how do I verify that it's the right cert now? I saved the certificate from within firefox, but the resulting .pem file has many certificates in it and net/http doesn't seem to like it.

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• Where can I get a Ruby 1.8.6 for Centos OS

  - by Yong

  Hi. Can anyone tell me where I can find a Ruby 1.8.6 so I can istall it in my Centos 5 machine? Thank you.

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• url validation in ruby on rails

  - by jpallavi

  1)Url field should also accept url as “www.abc.com”. If user enters url like this, it should be automatically appended with “http://” resulting in value saved in database as “http://www.abc.com”. If user enters url as “http://www.xyz.com” system should not append “http://”. User should be able to save url with “https://”. what is the code for it in ruby on rails?

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• Switching Ruby on Rails databases

  - by Marco

  Hi, I'm starting learning Ruby on Rails. So my application, like every Rails app, has three databases: Development Test Production And the question is: how do i switch from a db to another? Thanks

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• string.split method in ruby behaves funny to me

  - by Steve

  txt = "1aaa5" Then txt.split("a") produces [1, "", "", 5] in ruby 1.9. Anyone can explain why? Particularly, why not [1, 5]? Thanks.

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• Connect to MySQL in Ruby using NetBeans

  - by Varun

  I've downloaded the "dbd-mysql-0.4.4.zip" and linked it to my project. While I try to run a demo code from NetBeans the very first line require "dbi" gives me an error. Is there a different way to do it? I also tried jruby setup.rb config --with=dbi,dbd_mysql from the command prompt and it gave me the following error: config: unknown option --with=dbi,dbd_mysql Try 'ruby setup.rb --help' for detailed usage. Any suggestions please?

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• Getting a user country name from originating IP address with Ruby on Rails

  - by TK

  I want to extract a user country name from visitors' IP addresses. I could get the IP address with remote_ip. But what could be the easiest way to get the country name? It doesn't have to be super accurate. Any ruby library (gem or plugin) to do this? I want an simple and easy solution for this.

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• Good books on Ruby based DSL

  - by nijikunai

  I'm trying to create a DSL in ruby, can you suggest me some good books? I looked around amazon and safari but so far couldn't find any. Thanks in advance!

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• What's the __repr__ equivalence in ruby?

  - by prosseek

  The repr function is fancy as it is called when print OBJECT is used automatically? Is there a ruby equivalence for it? I thought it was to_s, but, I had p OBJECT doesn't seem to call the to_s method.

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• how does Enumerable#cycle work? (ruby)

  - by Radek

  looper = (0..3).cycle 20.times { puts looper.next } can I somehow find the next of 3? I mean if I can get .next of any particular element at any given time. Not just display loop that starts with the first element. UPDATE Of course I went though ruby doc before posting my question. But I did not find answer there ...

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• Extract number from string in Ruby

  - by Oscar Reyes

  I'm using this code: s = line.match( /ABCD(\d{4})/ ).values_at( 1 )[0] To extract numbers from strings like: ABCD1234 ABCD1235 ABCD1236 etc. It works, but I wonder what other alternative I have to to this in Ruby?

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• Custom formats in Ruby on Rails

  - by Koning Baard XIV

  I'm creating a website in Ruby on Rails, where users can login using RESTful Authentication. Someone can get a specific user using html, xml and json, just like scaffolding. But I want to add one more format: vCard (e.g. /users/1.vcard). This has a specific format, but how do I define my own formats? Using views, or must I use another way? Thanks

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• Why are Ruby projects so dominant at Github?

  - by timepilot

  Ruby is the most popular language at Github by far. Compare that with the questions at Stack Overflow or the TIOBE index. What is the reason for this difference in relative popularity in different places?

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