Checking multiple params in Ruby

Question

These params come out of html inputs in erb templates (this code is in the main application.rb), and I am checking if they are filled before I add them to n.requestusers, which will become part of a database entry. It works, but it feels more like a bash script the way it is now. What would be the best way to write something like this?

a route in the main .rb

if params[:user2].empty? && params[:user3].empty? && params[:user4].empty? && params[:user5].empty?
  n.requestusers = params[:user1]
elsif params[:user3].empty? && params[:user4].empty? && params[:user5].empty?
  n.requestusers = params[:user1], params[:user2]
elsif params[:user4].empty? && params[:user5].empty?
  n.requestusers = params[:user1], params[:user2], params[:user3]
elsif params[:user5].empty?
  n.requestusers = params[:user1], params[:user2], params[:user3], params[:user4]
else
  n.requestusers = params[:user1], params[:user2], params[:user3], params[:user4], params[:user5]
end

Answer 1

Instead of having all of those conditional statements might you be interested in something like:

n.requestusers = params.select { |key, val| not val.empty? }.values

Or a cleaner way as suggested by @theTinMan:

n.requestusers = params.reject { |key, val| val.empty? }.values

select lets you take all of the none empty parameter values and returns them. values lets you grab those values as an array.

I am not experienced with web frameworks, so my suggestion is a bit of a shot in the dark.