rails runnerとは railsの環境を読み込んだ上で任意のrubyコードが実行できるようです。 batch処理とかの時に使えるんじゃないでしょうか。 helpを見ると以下のように使うらしい。環境も指定できて便利ですね。 % rails runner -h Usage: rails runner [options] [<'Some.ruby(code)'> | <filename.rb>] -e, --environment=name Specifies the environment for the runner to operate under (test/development/production). Default: development -h, --help Show this help message. Examples: rails runner 'puts Ra
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