Help on has_one

Rails
1

I’m having:
colour model with id,name,value
car model, id,name,colour_id
chair model id,name,colour_id

  • i have a many to one relation, correct? - different type of objects
    have a colour.
    putting for the car and chair model an attribute has_one :colour, is’t
    enough. I thought that having:

class Car<ActiveRecord::Base
has_one :colour
def before_create()
colour = Color.new
colour.name = ‘red’
color.save
end
end

when I would create a Car object and save-it i should have in the
database for that record color_id <> 0, but
i found that it is NULL.
-what did I do wrong?