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【Rails】dynamic constant assignmentの対処法【Ruby】

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症状

railsで以下エラーが発生しました。 翻訳すると、「動的定数の割り当て」でした。
error
SyntaxError (C:/app/controllers/api/v1/users_controller.rb:21: dynamic constant assignment
          YOUR_DOMAIN = 'http://localhost:3000'
          ^~~~~~~~~~~
users_controller.rb
def update
user = User.find_by(id: params[:userId])

DOMAIN = 'http://localhost:3000'

if(user.save!(user_params)
  redirect_to DOMAIN + '?success=true',
else
  redirect_to DOMAIN + '?canceled=true',
end

end

解決方法

ApplicationControllerに移動して、解決しました。 定数をアクション内で書いたから怒られていたようです。
application_controller.rb
DOMAIN = 'http://localhost:3000'

参考

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