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<pre>
Started GET "/users?sort=mail%2Clogin" for 192.168.11.10 at 2015-03-20 12:35:41 +0900
Processing by UsersController#index as HTML
Parameters: {"sort"=>"mail,login"}
Current user: admin (id=1)
SQLite3::SQLException: no such column: mail: SELECT "users".* FROM "users"
WHERE "users"."type" IN ('User', 'AnonymousUser') AND (users.status <> 0)
AND "users"."status" = ? ORDER BY mail, login LIMIT 25 OFFSET 0
Completed 500 Internal Server Error in 4ms

ActiveRecord::StatementInvalid (SQLite3::SQLException: no such column: mail:
SELECT "users".* FROM "users" WHERE "users"."type" IN ('User', 'AnonymousUser')
AND (users.status <> 0) AND "users"."status" = ? ORDER BY mail, login LIMIT 25 OFFSET 0):
app/controllers/users_controller.rb:51:in `index'
</pre>
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Ability to sort users by email removed in r14140.
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