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How to call rake from ruby code

The following is a method to execute rake tasks from ruby code

: 
#arguments can be for example db:migrate
def call_rake(arguments)
    if RUBY_PLATFORM =~ /mswin/
      rake_cmd = "rake.bat" #very important because windows will break with just "rake"
    else
      rake_cmd = "rake"
    end
    puts "calling #{rake_cmd} " + arguments
    puts system("#{rake_cmd} " + arguments)
    puts $?
  end

Check out my Bullet on Rails project at Rubyforge.net to see how to call script generate scripts from ruby code.

Comments

Brent said…
Thanks! I couldn't for the life of me figure out why rake wasn't working through the system call in Windows, it never occurred to me to add the .bat extension to rake.

Another bit of strangeness with this. If you leave out the extension but redirect the output to a file, like system("rake --tasks > tmp.log"), it works.
11:11 AM
R said…
Awesome - thanks!
I ended up just needing this:

somefile.rb:

rake = 'rake'
arguments= '-f compile.rb'

#puts "Calling #{rake} " + arguments
system("#{rake} " + arguments)
3:32 PM
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