I want to create a rake task that takes one parameter with no argument.
task :mytask => :environment do
options = Hash.new
OptionParser.new do |opts|
opts.on('-l', '--local', 'Run locally') do
options[:local] = true
end
end.parse!
# some code
end
But it throws:
$ rake mytask -l
rake aborted!
OptionParser::MissingArgument: missing argument: -l
Meanwhile:
$ rake mytask -l random_arg
ready
Why?
If you do commit to this approach you need to separate your task's arguments from rake's own arguments:
rake mytask -- -l
Where -- means "end of main arguments" and the rest are for your task.
You'll need to adjust your argument parsing to trigger only on those particular arguments:
task :default do |t, args|
# Extract all the rake-task specific arguments (after --)
args = ARGV.slice_after('--').to_a.last
options = { }
OptionParser.new do |opts|
opts.on('-l', '--local', 'Run locally') do
options[:local] = true
end
end.parse!(args)
# some code
end
Going about it this way is usually really messy and not very user friendly, so if you can avoid it and employ some other method that's usually better.