File.open, write and save?

ruby-on-rails ruby rake rakefile
ChuckJHardy picture ChuckJHardy · Feb 15, 2011 · Viewed 89.1k times · Source

I am trying to get a .rb file to make another .rb file within a specific directory with specified content, when that file is run. I dont know whether the best way to do this would be with a Ruby file or a Rake file. You input would be great.

Answer

Simone Carletti picture Simone Carletti · Feb 15, 2011

If you just need to perform a simple script like creating a file, you can simply use a Ruby script without creating a rake task.

# file origin.rb
target  = "target.rb"
content = <<-RUBY
  puts "I'm the target!"
RUBY

File.open(target, "w+") do |f|
  f.write(content)
end

And you can execute the file with

$ ruby origin.rb

Related questions

Where are rake tasks defined?

On a freshly created Rails project (generated by rails someName), one can run some 'default' rake tasks like: rake test rake db:migrate etc Question is, where does these tasks get described? The default Rakefile doesn't have all these tasks. …

Read More
How can I run a ruby class from rake file?

I want to run a ruby class from a sample.rake file. Consider myruby.rb is a ruby file. I want to run this from sample.rake like ruby myruby.rb

Read More
Difference between rake db:migrate db:reset and db:schema:load

The difference between rake db:migrate and rake db:reset is pretty clear in my head. The thing which I don't understand is how rake db:schema:load different from the former two. Just to be sure that I am …

Read More