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I have a Ruby on Rails web app via which I want to access my smart card reader connected to my PC via a USB.

The idea is to press a button in the web app to initiate read action in the card reader.[I have a ruby script to read the data serially and do what I want].I however want to extend the functionality to the web app,i.e. when the user clicks the read button on the webapp the card details are read via the card reader and displayed in the web page(Ruby on Rails web app). I am not sure on how to go about it. These are some of the "sources" that I have encountered online which might be the possible way:


Anyone who has previously done the same please guide me on how to go about it.

Hey Chris,I don't have a Users Controller.I am using devise so i have a registrations controller
class RegistrationsController < Devise::RegistrationsController

def sign_up_params
params.require(:user).permit(:email, :user_name, :full_name, :password, :password_confirmation)

def account_update_params
params.require(:user).permit(:email, :user_name, :password, :password_confirmation, :current_password)

I added an index action and created an index.json.builder but when i navigate to /registrations.json i get an error

So how do i get json file.

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Hey Chris Awesome Tutorial.
Can you do an Instagram like app tutorial with features like geolocation,tagging user in an image and hashtags