Syntax for handling parameters dynamically

Question

A series of parameters are being submitted to a Rails controller:

"25"=>"true", "30"=>"false", "35"=>"true", "40"=>"true", "45"=>"true", "50"=>"true", "55"=>"true", "60"=>"true", "65"=>"false", "70"=>"true", "75"=>"true", "80"=>"false", "100"=>"true"

The goal is to loop through:

@age_limits = [25,30,35,40,45,50,55,60,65,70,75,80,100]

and process based on each param's value.

The problem is that the syntax for referring to the param is evading me:

@age_limits.each do |limit|
  puts params[:"#{limit}"]
  if params[:"#{limit}"] == "true"
    session[:demographic_agegroups] << params[:"#{limit}"]
    puts session[:demographic_agegroups]
  end
end

Both params[:"#{limit}"] and params[":#{limit}"] do not allow to access the parameter. The former will return the value by putting into console (editor BBEdit does not consider it properly formed Ruby), but will not allow to process in its basis.

How can the controller properly access the param and process based on its value?

What about to params["#{limit}"] ? From your output, its simple string and you can use limit.to_s — 7urkm3n
– 7urkm3n, Commented Sep 4, 2020 at 5:57

7urkm3n · Accepted Answer · 2020-09-04 06:03:32Z

2

You'r missing to convert int to string.

Since your params keys are string, you can use params[limit.to_s].

Also, if its key based "keyX".to_sym would be :keyX

answered Sep 4, 2020 at 6:03

7urkm3n

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1 Comment

Jerome Over a year ago

Useful. Succinct. I am surprised that a symbol that gets handled that way.

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