ruby on rails - How do I check to see if my array includes an object?

Question

I have an array @horses = [] that I fill with some random horses.

How can I check if my @horses array includes a horse that is already included (exists) in it?

I tried something like:

@suggested_horses = []
  @suggested_horses << Horse.find(:first,:offset=>rand(Horse.count))
  while @suggested_horses.length < 8
    horse = Horse.find(:first,:offset=>rand(Horse.count))
    unless @suggested_horses.exists?(horse.id)
       @suggested_horses<< horse
    end
  end

I also tried with include? but I saw it was for strings only. With exists? I get the following error:

undefined method `exists?' for #<Array:0xc11c0b8>

So the question is how can I check if my array already has a "horse" included so that I don't fill it with the same horse?

Answer 1

Arrays in Ruby don't have exists? method, but they have an include? method as described in the docs. Something like

unless @suggested_horses.include?(horse)
   @suggested_horses << horse
end

should work out of box.