Thinking Sphinx OR on multiple columns within scope

Question

I need a way of conditioning a scope so that it checks if a value exists in one of three columns. This is my not code, I have just been told to edit it so it's hard to understand.

So, my condition in MYSQL would be:

WHERE `sub_client_1_id` = 53 OR `sub_client_2_id` = 53 OR `sub_client_3_id` = 53

I tried the following:

sphinx_scope(:by_sub_client){ |id| {:condition => "`sub_client_1_id` = #{id} OR `sub_client_2_id` = #{id} OR `sub_client_3_id` = #{id}" }}

But that doesn't work.