how to parse json url response in rails

Question

I've a simple Rails app that makes a request to an external website and returns a json url response with a callback to my site to notify my Rails app about the response. The json url sample is https://voguepay.com/?v_transaction_id=demo-1345109950&type=json and the response body is below:

{"merchant_id":"demo","transaction_id":"demo-1345109950","email":"testuser@buyerdomain.com","total":"10","total_paid_by_buyer":"10.00","total_credited_to_merchant":"9.90","extra_charges_by_merchant":"0.00","merchant_ref":"","memo":"Donation of N10 to Test User","status":"Approved","date":"2012-01-01 11:39:11","referrer":"http:\/\/sellerdomain.com\/buy_now.html","method":"VoguePay","fund_maturity":"2012-01-03"}

I'd like to convert this response into a Rails method than can simply give me the attribute I need to make my query. For example, from the response body I need to make an action like:

def notify
  response = Json.parse('https://voguepay.com/?v_transaction_id=demo-1345109950&type=json').body
  response.status
  response.date
  response.merchant_id
  response.total
end

The code above is just a sample to explain what I want to achieve. Any help will be great.

I've tried both typhoeus and yajl-ruby gems but when the request comes in, all my authentication methods are removed and I keep getting the error message cannot authenticate csrf meta token. Even if I skip it the current user will be signed out automatically ( with devise authentication). The code sample used is below:

class NotificationsController < ApplicationController
  skip_before_filter :verify_authenticity_token

  def notify
      @transaction_id = params[:transaction_id]
      do_notify
  end

  private
  def do_notify
    hydra = Typhoeus::Hydra.new
    request = Typhoeus::Request.new("https://voguepay.com/?v_transaction_id=#{@transaction_id}&type=json")
    request.on_complete do |response|
        logger.info("#{response.request.url} in #{response.time} seconds")  #remove in production to avoid huge logs
              transaction = Yajl::Parser.parse(response.body)  #or Yajl::Parser.parse(response.body)

              #Now we have the following keys in our transaction hash  you can do whatever
              transaction[:merchant_id]
              transaction[:transaction_id]
              transaction[:email]
              transaction[:total]
              transaction[:merchant_ref]
              transaction[:memo]
              transaction[:status]
              transaction[:date]
              transaction[:referrer]
              transaction[:method]
              @plan = Plan.find_by_id(transaction[:merchant_ref])
              if(transaction[:total] == 0)
                logger.error "Invalid total for transaction:#{@transaction_id}"
                 #do not subscribe the user or generate invoice, notify user of error n cancel order
              elsif(transaction[:status] != 'Approved')
                logger.error "Failed transaction for transaction:#{@transaction_id}"
                 #do not subscribe the user or generate invoice, notify user of error n cancel order
              elsif(transaction[:total] >= @plan.naira_price.to_s)
                current_user.award_user_credits(@plan.hjc.to_i)
              end            
    end
    hydra.queue(request)
    hydra.run
  end
end

Anymore, I don't want to use a gem I want to do it manually to see if the csrf meta token will not be affected. So any idea on how I can achieve this will be great. I am using rails 3.2.9.

Thank you!

score 6 · Accepted Answer · answered Dec 05 '12 at 13:39

6

You can do:

def notify
  response = JSON('https://voguepay.com/?v_transaction_id=demo-1345109950&type=json').body
 response["status"]
 response["date"]
 response["merchant_id"]
 response["total"]
end

answered Dec 05 '12 at 13:39

rorra

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And this will work fine?. Awesome I will try this out. But will i get the csfr token error. – Uchenna Dec 05 '12 at 14:14
Check http://stackoverflow.com/questions/5669322/turn-off-csrf-token-in-rails-3 to see how to disable csrf protection for a particular action. That should fix the issue – rorra Dec 05 '12 at 14:24

how to parse json url response in rails

1 Answers1