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rails runnerで起動するスクリプトにオプションを渡す

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基本的にはそのまま末尾に列挙する、で問題ありません。

require 'optparse'

options = {}

OptionParser.new { |o|
  o.banner = "Usage: #{$0} [options]"
  o.on("--opt1=OPT", "option1") { |v| options[:opt1] = v }
  o.on("--opt2=OPT", "option2") { |v| options[:opt2] = v }
}.parse!(ARGV.dup)

p options
$ bundle exec rails runner script/do_something.rb --opt1=foo --opt2=bar
{:opt1=>"foo", :opt2=>"bar"}

が、--helpは rails runnerのオプションとして定義されているので、そのまま渡してしまうと先に喰われて起動し、scriptに渡されない問題があります。

$ bundle exec rails runner script/do_something.rb --help
Usage: runner [options] ('Some.ruby(code)' or a filename)

    -e, --environment=name           Specifies the environment for the runner to operate under (test/development/production).
                                     Default: development

    -h, --help                       Show this help message.

You can also use runner as a shebang line for your scripts like this:
-------------------------------------------------------------
#!/usr/bin/env /Users/yoshida/proj/miil/foodflowrb/script/rails runner

Product.all.each { |p| p.price *= 2 ; p.save! }
-------------------------------------------------------------

そのため、--で標準入力を実際実行したいスクリプトに渡すようにします。普段から使うようにしておくと、変なハマり方もしなくて済みそうです。
ただ、ARGV--が含まれるので取り除く必要があります。

require 'optparse'

options = {}
argv = ARGV.dup
if argv.include? "--"
  argv.delete "--"
end

OptionParser.new { |o|
  o.banner = "Usage: #{$0} [options]"
  o.on("--opt1=OPT", "option1") { |v| options[:opt1] = v }
  o.on("--opt2=OPT", "option2") { |v| options[:opt2] = v }
}.parse!(argv)

p options
$ bundle exec rails runner script/do_something.rb -- --help
Usage: script/do_something.rb [options]
        --opt1=OPT                   option1
        --opt2=OPT                   option2
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