Glenn Jahnke's blog
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Server-Side Image Editing
"What's the latest and greatest server-side image processing library people are using?"
Most people quickly agreed that ImageMagick was the way to go.
Data Analysis
"Are there good libraries for data analysis similar to NumPy in Python but for Ruby?"
While there may not be many Ruby libraries that directly comparable to NumPy, there are a fair number of packages to do related work. For instance, you can utilize RSRuby which is a bridge between the R statistical language and Ruby. GnuPlot is another Ruby library that allows both data processing and plotting of graph data.
RSRuby - R / Ruby binding
GnuPlot - Data processing and Plotting
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Testing for class methods in Ruby
How do you test for the existence of a class method? Test it using #respond_to?
class Foo
def self.bar
puts "Hello, World!"
end
end
Foo.respond_to?(:bar)
=> true
And to make sure we are really just talking about class methods and not instance methods:
foo = Foo.new
foo.respond_to?(:bar)
=> false
Interesting
RubyMine and Rspec2 Bug Fixed!
We use the latest and greatest RubyMine version available at Pivotal, but sometimes technology choices such as Rails 3 and Rspec 2 are still ahead of it. The formatter that analyzes test output breaks on Rspec 2's output before any tests run. The bug is further discussed http://youtrack.jetbrains.net/issue/RUBY-6485. Luckily this bug will be fixed in the next EAP release.
Excuting .rvmrc commands and cruisecontrol
We've had a difficult time getting .rvmrc files to work with cruisecontrol.rb builds. Specifically, ccrb seems to launch the rake task in the project working directory. This means that the .rvmrc file is ignored. A workaround is to have your CI script directly use RVM or to add "cd .. && cd work" before your project cruise script or rake task.