Question

How do you access an operator/method via a variable?

So instead of this:

c = Computer.new
c.computer_name = "bla"
c.operating_system = "Windows XP"
c.user_name = "joesmith"
c.save

(plus many more)

I want to use a hash and assign the values dynamically:

c = Computer.new
params.each do |key,val|
    c."#{key}" = val.to_s
end
c.save

Also, what is the correct terminology here?

Answer 1

One trivial way (not DataMapper-specific, but assumes a prop_name= method), is to use send:

c.send("#{key}=".to_sym, val.to_s)