On 15 March 2010 16:48, Mr Horse <[email protected]> wrote: > 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"?
No, as neither model would have the foreign key column, see below. > > 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). This is the right way to do it even though prediction belongs_to race sounds a bit odd. The model that 'belongs_to' is the one with the the foreign key (prediction has a column race_id in this case). You will find that belongs_to often does not seem quite the correct way of stating the relationship, but if the has_many seems right (race has_many predictions) and each of the predictions (in this case) is associated with one (race in this case) then that is the way to do it. Colin > > Eddie > -- > Posted via http://www.ruby-forum.com/. > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
