How do I describe an enumeration column in a Rails 3 migration?

Question

How do I describe an enumeration column in a Rails 3 migration?

Answer 1

What worked for me was mapping it from symbols to integers

TYPE_MAP = { type_one: 1, type_two:2, another_type:3 }

def type
    TYPE_MAP.key(read_attribute(:type))
end

def type=(s)
    write_attribute(:type, TYPE_MAP[s])
end

But for the controller you have to map it again like this:

 def create
  @cupon_type = CuponType.new(params[:cupon_type])
  @cupon_type.type = params[:cupon_type][:type].to_sym

Note the .to_sym that overrides the first creation on the object (in my case it was coupons).

Now you can use it like this:

c.type == :type_one
c.type = :type_two