CODEWITHSUNDEEP
rubyjson
Godzilla74
Godzilla74

Reputation: 2512

Get value from JSON response in Ruby

I am making a JSON call to a Ruby on Rails server via a client side ruby script, which returns the following JSON:

get_data.rb

require 'net/http'
require 'open-uri'
require 'json'

def get_functions(serial_number, function)
  request_uri = "http://localhost:3000/devices/#{serial_number}"
  buffer = open(request_uri).read
  result = JSON.parse(buffer)
  puts result
end

{ "serial_number" => "111aaa",
  "device_functions" => [
    { "can_scan" => true,
      "can_halt" => true
    }
  ],
  "host_options" => [
    { "exclude_ip" => "10.10.10.100-110",
      "scan_ip" => "10.10.10.1"
    }
  ]
}

Now, I'm wanting to just extract certain values from the response to determine what can/cannot be done on the client side:

scan.rb

if get_functions('111aaa', 'can_scan')
  result = %x( ping 10.10.10.1 )
else
  result = "Not allowed to perform action!"
end

I'm stuck with how I can extract the value of can_scan from my JSON in get_data.rb for my get_functions method to be able to run its if statement correctly.

Upvotes: 0

Views: 2300

Answers (1)

Igor Belo
Igor Belo

Reputation: 738

Your get_functions is returning nil as the last line is an I/O operation (puts). Change your function to:

def get_functions(serial_number, function)
  request_uri = "http://localhost:3000/devices/#{serial_number}"
  buffer = open(request_uri).read
  result = JSON.parse(buffer)
  puts result
  result
end

And access the Hash:

result = get_functions(serial_number, function)
result["device_functions"].first["can_scan"]

Upvotes: 4

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