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hamlでclass名を動的に設定する

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hamlのdivは%divを省略することができるが、

div
%div.alert
.alert

class名を動的に設定するなら、
%div記法を使わないとできない。

flash
- flash.each do |message_type, message|
    %div{class: "alert alert-#{message_type}"}
     =message
okjnag
Rails/React.js
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