Rails - Dec 2007 - assigning alternating attributes

I will have a number of teachers each assigned a number of spots on a
schedule.

The teachers name will be displayed each cell they are assigned and I
want the background display of each teacher to be a different color
which I will retrieve in the view and insert into an inline style.

I decided to make the background color an attribute of a teacher_day
model.  I''ll assign colors shortly after I''ve created a
collection of
teacher_days for a schedule.

here is a method  I tried that doesn''t work

def assign_colors
  for teacher in @schedule.teacher_days
    teacher.update_attributes( :bgcolor => cycle("red",
"green", "blue")
)
  end
end


The cycle doesn''t seem to work within the update attributes..saying
that
it isnt a   method for <object>.

I would like to easily be able to expand or contract the number of items
in the color array. (I probably should keep it as a constant someplace
else too?).
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I answered my question using something like this:

 def assign_colors
   color_array = ["red", "green", "blue"]
   count = 0
   for teacher in @schedule.teacher_days
     cy_color = color_array[count]
     count += 1
     count = 0 if count >= color_array.length
     teacher.update_attributes( :bgcolor => cy_color )
   end
 end
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