Question

I have a Rails 3 application and I am using the following code to parse a JSON post:

email_payload = JSON.parse(params[:payload])
Result.create(:from => email_payload['from'], :from_name => email_payload['from_name'], :from_address => email_payload['from_address'], :date => email_payload['date'], :html_body => email_payload['html_body'], :priority => email_payload['priority'], :spam_status => email_payload['spam_status'], :subject => email_payload['subject'])

The JSON post data is as follows:

payload{ "address_identifier": null, "attachments": [ [ "twitter.png", "image/png", 3029, "http://api.deliverhq.com/api/incoming/attachment/7gdd71wo75/5772412/0" ] ], "cc": null, "date": "Thu, 25 Oct 2012 22:04:20 +0100"

I am trying to work out how to parse the URL, in this case http://api.deliverhq.com/api/incoming/attachment/7gdd71wo75/5772412/0, and then enter the URL into the database.

:url => email_payload['attachments']

won’t work because there is multiple values within attachment and:

email_attachments_payload = JSON.parse(params[:payload][:attachments])
:url => email_attachments_payload['URL']

won’t work because the URL doesn’t have an identifier. For this particular application there should only ever be one attachment, therefore selecting .first may be an option if that’s possible.

Any pointers would be appreciated!

UPDATE:

Adding:

email_payload[:attachments][0][4]

results in the following exception error:

NoMethodError: undefined method []' for nil:NilClass

UPDATE 2

def receive_fax
    if request.get?
        render :text => "hello"
    elsif request.post?   
      email_payload = JSON.parse(params[:payload])     
      Fax.create(:from => email_payload['from'], :from_name => email_payload['from_name'], :from_address => email_payload['from_address'], :date => email_payload['date'], :html_body => email_payload['html_body'], :priority => email_payload['priority'], :spam_status => email_payload['spam_status'], :subject => email_payload['subject'], :fax => email_payload[:attachments][0][3])
      render :text => "success"
    else
      render :text => "error"
    end
  end

Answer 1

Please try: email_payload[‘attachments’][0][3]

It appears that the problem may be the difference between :attachments (a symbol) and ‘attachments’ (a string).