[Question] How to use JSON Patch with SSE in Rails Controller?

[HLFH]

Hi @tenderlove ,

In the controller:

module Api::V1
  class TestController < ApiController
    include ActionController::Live

    def ticker
      response.headers['Content-Type'] = 'text/event-stream'
      sse = Ticker::SSE.new(response.stream)
      begin
        loop do
          test = Test.desc
          a = test.second.as_json(except: ["created_at", "updated_at", "_id"]) 
          b = test.first.as_json(except: ["created_at", "updated_at", "_id"])
          diff = JsonDiff.generate(a, b)
         patch = Hana::Patch.new [diff]
         #what to do then with `patch.apply` and `sse.write`?
          sse.write(json)
        end
      rescue IOError
        logger.info 'Client disconnects causes IOError on write'
      ensure
        sse.close
      end
    end
  end
end

In app/lib/ticker/sse.rb

module Ticker
  class SSE
    def initialize(io)
      @io = io
    end

    def write(object, options = {})
      options.each do |k,v|
        @io.write("#{k}: #{v}\n")
      end
      @io.write("data: #{JSON.dump(object)}\n\n")
    end

    def close
      @io.close
    end
  end
end

Many thanks,