Thanks for the advice Aldric. This approach makes sense, but I get a 
little confused with the relationship between predictions and races.

A prediction has_one race, but does this mean that a race must belong_to 
a prediction? While the first statement is correct (a prediction has_one 
race), a race has many predictions associated with it. Is it possible to 
state that a "race has_many predictions" as well as saying that a 
"prediction has_one race"?

I could say that a race has_many predictions and a prediction belongs_to 
a race, but it makes more sense to me to think of a prediction having a 
race as opposed to the other way around (a prediction belonging to a 
race).

Eddie
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