Hi all!
Recently I discovered that AR tries to treat question marks inside SQL
string literals as parameters, however this behaviour shows in very rare
cases, for example (very odd, but...):
User.where("NOT EXISTS (#{ Comment.where('user_id = users.id AND body ILIKE
?', '%?').to_sql }) AND created_at > ?", Date.yesterday).to_sql
It will fail, because inner SQL will contain qmark inside of literal, which
AR will count as query parameter
(https://github.com/rails/rails/blob/master/activerecord/lib/active_record/sanitization.rb#L129),
but there is only one argument.
However, this will work (because AR skip parameter binding when no
arguments are given):
User.where("NOT EXISTS (#{ Comment.where('user_id = users.id AND body ILIKE
?', '%?').to_sql })").to_sql
So is it a minor bug or a correct behaviour?
P.S. Unlike AR, database drivers don't try to bind qmarks inside of string
literals
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