Pubnub and Rails 4 - ruby-on-rails

Question

I'm following a twitter tutorial for a class project and I'm stuck at the part where the tutorial is using PUBNUB. I'm getting the following error:
Showing C:/RubyProjects/twitter/app/views/layouts/application.html.erb where line #93 raised:
**wrong number of arguments(1 for 0)**
Extracted source (around line #93):
PUBNUB.subscribe({
channel : "<%= Digest::SHA1.hexdigest(current_user.username, current_user.created_at) %>",
callback : function(message) { updateTimeline(message) }
I found on stackoverflow and found that EventMachine helped some folks and I tried that but still nada :(
I checked the PUBNUB page on Github and saw that it has changed the way channel and callback was written so I tried doing that but it did not help either. Im still getting the same error about wrong number of arguments(1 for 0).
Notify.rb
class Notify
def self.deliver_message_to_user(params)
post = Post.find(params[:post_id])
user = User.find(params[:user_id])
user.channel ||= Channel.new(
:channel_ident =>
Digest::SHA1.hexdigest(user.username, user.created_at.to_s))
Pubnub.publish({
:channel => user.channel.channel_ident,
:message => post.to_json(:include => :user)
})
end
end
application.html.erb
<script>
function updateTimeline(message) {
var html = JST['post'](jQuery.parseJSON(message));
$('#timeline').prepend(html);
}
Pubnub.subscribe({
:channel => "<%= Digest::SHA1.hexdigest(current_user.username, current_user.created_at) %>",
:callback => function(message) { updateTimeline(message) }
})
</script>
I put require 'digest' in my application.rb file and it still din't help. Could it be the syntax? If it is, i'm not sure what the correct syntax would be.

Answer 1

Publishing PubNub Messages in Ruby on Rails 4.0+
I'm pulling the following details from the PubNub Ruby README.md file - https://github.com/pubnub/ruby/blob/master/README.md
First you need to require PubNub lib from the PubNub Gem in Ruby.
## Require PubNub Gem
require 'pubnub'
## Instantiate a new PubNub instance.
pubnub = Pubnub.new(
:publish_key => 'demo', # publish_key only required if publishing.
:subscribe_key => 'demo', # required
:secret_key => nil, # optional, if used, message signing is enabled
:cipher_key => nil, # optional, if used, encryption is enabled
:ssl => nil # true or default is false
)
## Create a callback for checking response of Publish
#my_callback = lambda { |message| puts(message) }
## Execute Publish
pubnub.publish(
:channel => :hello_world,
:message => "hi",
:callback => #my_callback
)
## Sometimes you need a sleep depending on your server type
sleep(1)