Running a Ruby script via web - ruby-on-rails

Question

I am following the Rails Tutorial by Michael Hart and I am already on Chapter 7. But I wanna do something different right now, which the tutorial doesn't teach. I wanna run a script file inside my webpage. How I can do that? I saw other posts here saying to use Sinatra, but since I am following this tutorial I don't think it is such a good idea to use it because it can make everything different from the tutorial.
Here is the simple script I wanna run on my webpage:
#Somando idades
def soma_vetor_excluindo(index,vet)
soma = 0
for i in 0..9
if(i!=index)
soma = soma + vet[i].to_i
end
end
return soma
end
def soma_vetor(vet)
soma = 0
for i in 0..9
soma = soma + vet[i].to_i
end
return soma
end
def maior_vetor(vet)
maior = 0
for i in 0..9
if(maior < vet[i])
maior = vet[i]
end
end
return maior
end
idades = (0..9).collect{rand(99)+1}
soma_idades = (0..9).collect{0} soma = 0
print "#{idades} \n"
for i in 0..9
soma_idades[i] = soma_vetor_excluindo(i,idades)
end
print "#{soma_idades} \n"
div = soma_vetor(soma_idades) / 9
resp = div - maior_vetor(soma_idades)
puts "#{resp}"

Answer 1

The simplest way to do it would be to make the method soma_vetor_excluindo, soma_vetor, maior_vetor, etc, controller methods, so when you send data through a form or ajax, the action would trigger, calculate the values and return you a result.
Knowing this, you can have a controller, let's say MathController.rb, and inside it, the soma_vetor_excluindo method:
class MathController < ApplicationController
def soma_vetor_excluindo
end
def soma_vetor
end
def maior_vetor
end
end
To access this, you probably need a route, so on your routes.rb add something like this:
get 'math/soma_vetor_excluindo/:index/:vet', to 'math#soma_vetor_excluindo'
get 'math/soma_vetor/:vet', to 'math#soma_vetor'
get 'math/maior_vetor/:vet', to 'math#maior_vetor'
This means that when your browser hit localhost/math/soma_vetor_excluindo/1/2 or the other urls, it would send a get request to the controller calling the soma_vetor_excluindo method and putting in the parameters, params[:index] and params[:vet], so theoretically the script would run.
The thing is, you can adapt your controller to do something like this with very little work.

Answer 2

I believe the simplest solution is to load a page per script. First you add a path for your script into the routes.rb with something like:
get 'scripts/your_script', to 'scripts#your_script
And in the controller (app/scripts_controller.rb) you should add your code like this:
class ScriptsController < ApplicationController
#Somando idades
def soma_vetor_excluindo(index,vet)
soma = 0
for i in 0..9
if(i!=index)
soma = soma + vet[i].to_i
end
end
return soma
end
def soma_vetor(vet)
soma = 0
for i in 0..9
soma = soma + vet[i].to_i
end
return soma
end
def maior_vetor(vet)
maior = 0
for i in 0..9
if(maior < vet[i])
maior = vet[i]
end
end
return maior
end
def your_script
idades = (0..9).collect{rand(99)+1}
soma_idades = (0..9).collect{0}
soma = 0
answer = "#{idades} \n"
for i in 0..9
soma_idades[i] = soma_vetor_excluindo(i,idades)
end
answer << "#{soma_idades} \n"
div = soma_vetor(soma_idades) / 9
resp = div - maior_vetor(soma_idades)
answer << "#{resp}"
render(text: answer)
end
end
when you access the page scripts/your_script, it should render a plain text presentation of your script result.
Although this is not the most elegant solution, it should solve your problem.