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whereメソッドで生SQLを書く時の注意

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文字列で生SQLを用意してwhereメソッドに渡す際
""を渡すと、少々極端な例だが下記のようになる。

sql = "id = 1"
User.where(sql)
# 発行されるSQL
# SELECT  `users`.* FROM `users` WHERE (id = 1)

sql = ""
User.where(sql)
# 発行されるSQL
# SELECT  `users`.* FROM `users`

エラーが出ず、不要なデータを取得するため注意。

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