I''ve already asked about this on StackOverflow with no luck on answer -
http://stackoverflow.com/questions/12617237/rails-3-2-force-prepared-statements/12617681
Simplified Case:
Hotel.find(1) - use prepared statement
# SELECT "hotels".* FROM "hotels" WHERE
"hotels"."id" = $1 LIMIT 1 [["id",
1]]
Hotel.where(id: 1) - without prepared statement
# SELECT "hotels".* FROM "hotels" WHERE
"hotels"."id" = 1
Hotel.where(Hotel.arel_table[:id].eq(1)) - without prepared statement
# SELECT "hotels".* FROM "hotels" WHERE
"hotels"."id" = 1
Hotel.where(''id = :id'', id: 1) - without prepared statement 
# SELECT "hotels".* FROM "hotels" WHERE (id = 1)
How to force rails to use prepared statements? May be not in all cases, but 
at least with arel_table.
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