改进使用Ruby'map'和'splat'转换数组的代码

Question

I am using Ruby on Rails 3.2.2 and I would like to improve code below, maybe using some Ruby on Rails method.

I have an Array ["one", "two", "three"] for which I make

# From `Symbol`s to `String`s
array = [:one, :two, :three].map {|k| k.to_s}
# => ["one", "two", "three"]

and then (the attr_accessible method used below is just a sample method and only serves to give an idea of what I do; in production I use the "splat" array in a my custom method)

attr_accessible *array
# => attr_accessible "one", "two", "three"

Is there a better way to make the above? If so, how can I "convert" the ["one", "two", "three"] array in an "elegant" way?

Answer 1

In plain Ruby you can do

array = [:one, :two, :three].map(&:to_s)

With the map_by_method gem you can do:

array = [:one, :two, :three].map_by_to_s

If you implement your custom method like this:

def foo(*args)
  converted_args = args.flatten.map(&:to_s)
end

You can call it like

 foo "one", "two", "three"
 foo :one, :two, :three

 args = [:one, :two, :three]
 foo *args
 foo args # see flatten above

Answer 2

Your question is unclear to me. I can't make out whether you want to convert an array of strings to an array of symbols, or if you want to convert an array of symbols to an array of strings? Or maybe you're looking for a better solution than using splat. In any case ...

To convert strings to symbols, use to_sym.

["one", "two", "three"].map(&:to_sym)

To convert symbols to strings, use to_s (as @Mr.Ronald's answer shows)

[:one, :two, :three].map(&:to_s)