values are not saved in session array

Question

In my controller action i initialize a session of array and inserting values. These values are coming from the client side through ajax, so the page is not refreshed while inserting these values to an array.But suprisingly every time it iniatialize a new session instead of inserting to the same defined session. Here is my code

controller

def receive_tags parser = Yajl::Parser.new @hash = parser.parse(request.body.read) log=Logger.new(STDOUT) log.error(@hash) session[:tags]||=[] session[:tags] << @hash["tag"] unless session[:tags].empty? log.error(session[:tags] ) #this keeps printing the current value i was expecting it to print a list of values including the previous end render :nothing=>true end

Ajax

 var myobj={tag:"mytag"}; $.ajax({ url: 'ips/receive_tags', type: 'post', contentType: 'application/json; charset=UTF-8', accept: 'application/json', dataType: 'json', data:JSON.stringify(myobj), success: function(res) { if (res.ImportResponse !== void 0) { console.log('Success: ' + res); } else if (res.Fault !== void 0) { console.log('Fault: ' + res); } }, error: function() { console.error('error!!!!'); } });

Please indent your code. Nobody wants to read unindented code. — user229044
– user229044 ♦, Commented Dec 7, 2012 at 16:08

Scott S · Accepted Answer · 2012-12-07 16:33:35Z

1

This sounds like the browser isn't saving cookies, which would explain the behavior you are seeing where the session is reinitialized every time. To confirm this, you can do

print "Session ID: #{request.session_options[:id]}"

in your action and see if the session id changes for each request. If it does, check your browser privacy settings and see if it is saving any cookies.

answered Dec 7, 2012 at 16:33

Scott S

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10 Comments

katie Over a year ago

The session ID keeps changing , it prints the particular current value

katie Over a year ago

And i just checked my browser settings ,it does save cookies, I am using firefox, says Firefox will remember history.Did you try in your environment to see if it works for you?

Scott S Over a year ago

Yes, session[:spike] ||= [] session[:spike] << params[:spike_param] works fine for me - it appends params[:spike_param] exactly as expected. You might try a different browser, or go to Firefox Preferences > Privacy and click remove individual cookies. If you search for "localhost" here you should have one for your application.

katie Over a year ago

I just tried in chrome , it does the same thing, so it seems like the problem is in the code not browser.

Scott S Over a year ago

If the session id changes each request, that really indicates that rails is generating a new session for each request, you just have to figure out why. Is your session set to expire? Look for a line in your application.rb like config.action_controller.session = {:expire_after => 60*60}

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Community · Accepted Answer · 2017-05-23 10:28:49Z

Finally i figured it out, The problem is i wasn't setting the request header for the token before sending ajax call so Rails was receiving data without the token, thus kept assuming it is a new object for every request.You can read more here.To set the request header add

 beforeSend: function(xhr) { xhr.setRequestHeader('X-CSRF-Token', $('meta[name="csrf-token"]').attr('content')); }

Below is my ajax function that works

var myobj={tag:"mytag"}; $.ajax({ url: 'ips/receive_tags', type: 'post', contentType: 'application/json; charset=UTF-8', accept: 'application/json', dataType: 'json', data:JSON.stringify(myobj), beforeSend: function(xhr) { xhr.setRequestHeader('X-CSRF-Token', $('meta[name="csrf-token"]').attr('content')); } success: function(res) { if (res.ImportResponse !== void 0) { console.log('Success: ' + res); } else if (res.Fault !== void 0) { console.log('Fault: ' + res); } }, error: function() { console.error('error!!!!'); } });

Interesting. I've never run into this, but its something to keep in mind. Glad you got it working.

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