The Ruby %r{ } expression
In a model there is a field validates :image_file_name, :format => { :with => %r{\.(gif|jpg|jpeg|png)$}i It looks pretty odd for me. I am aware that this is a regular expression. But I would like: to know what exactly it means. Is %r{value} equal to /value/ ? be able to replace it with normal Ruby regex operator /some regex/ or =~. Is this possible?
How to render a partial in sinatra view (haml in haml)?
I have a simple sinatra app that uses haml and sass for the views. One of the views (located in the views folder) is a partial for my navigation menu. I am trying to render it from index.haml but I get the following error: wrong number of arguments (1 for 2) I am trying to render it with the following lines in index.haml .navigation = render :partial => "nav"
Ruby: Destructors?
I need to occasionaly create images with rmagick in a cache dir. To then get rid of them fast, without loosing them for the view, I want to delete the image-files while my Ruby Instance of the Image-Class get's destructed or enters the Garbage Collection. What ClassMethod must I overwrite to feed the destructor with code?
How can I read a password from the command line in Ruby?
I am running Ruby and MySQL on a Windows box. I have some Ruby code that needs to connect to a MySQL database a perform a select. To connect to the database I need to provide the password among other things. The Ruby code can display a prompt requesting the password, the user types in the password and hits the Enter key. What I need is for the password, as it is typed, to be displayed as a line of
Library not loaded: libmysqlclient.16.dylib error when trying to run 'rails server' on OS X 10.6 with mysql2 gem
I've been struggling with this for some time. I've installed Rails 3, gem, mysql on my Snow Leopard machine. All was going well until I created my first project and tried to run rails server Upon running this I get: jontybrook$ rails server /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not lo
Should I use Ruby 1.9.2 with my new web app?
I have been successfully converting all my Rails projects (except one, but I'm working on it) from Ruby 1.8.7/Rails 2.3.5 to Rails 3.0.0 and Ruby 1.8.7/1.9.2 RC2 and both environments are pretty stable. Fortunately, things changed since I posted this question. Rails Unless you really have something that prevents you to do that, I strongly encourage you to start with Rails 3. The effort required to
How do I install Ruby with libyaml on Ubuntu 11.10?
I installed ruby-1.9.3-p0 on my Ubuntu 11.10 wubi and then rubygems to get Rails set up. This is my code: sudo ruby setup.rb I got this error: "/usr/local/lib/ruby/1.9.1/yaml.rb:56:in'<top(required)>': It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby." I installed libyaml and reinstalled Ruby but still it
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