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tapを使ってメソッドチェインの途中の値をログ出力する ref:
# => "tseu"
"Test".upcase.tap{|s| p s }.reverse.tap{|s| p s }.next.tap{|s| p s }.swapcase
# => "tseu"
"Test".upcase.tap{|s| Rails.logger.debug s }
# => "tseu"
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