#414 Batch API Requests pro
Here I demonstrate how to perform bulk API operations though a single request using Rack middleware. This is great if you need to trigger multiple actions at once such as if the user goes offline.
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Thanks! I would really like to see more episodes on the "offline" subject.
He has! Search for "offline"
+1 !
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Of course I agree
Love this episode. Very useful stuff Ryan. Great to see the mechanics of this explained. It would also be cool to wrap this up into a gem. Almost seems like something that should be added to Rails core!
:+1: really enjoyed this episode.
Yeah it was really good !
+1 Good episode
+1 Its awesome
I love Too, nice share
I love Too, nice API
Anyone noticed strange artifacts between 5:13 and 5:50 mins when Ryan is explaining the Rack request variables (iTunes MP4 version)?
Same issue here
Aye, me too. (Chrome on Mac Lion)
Got the same issue with the 5:13 -> 5:50...
Hi Julius, thx, now it's runnung for me
Ryan,
You already use something like that in production? How about performance, may need to limit requests or something like that right?
First comment on railscasts, so here is the mandatory (and more than deserved) nicety : great job with this site!
Just a quick comment though that kept bugging me while watching this episode, since I'm a nitpicker. I don't like when the "else" is far from the "if", especially if the "if" is somewhat long. You could invert the condition here to make it easier to read. However, I also try to avoid 2-branches conditions when I can bail early. For example here, the first line could be "return @app.call(env) unless env["PATH_INFO"] == /batch", and you can then proceed with the rest of the function without the condition. General rule : when the first line of a method is an "if" and the last one closes that if you can always 1- avoid the 2 branches, 2 - both "branches" should be methods, if they are not simple one liners.
I guess there are many ways to refactor this, but that's the one I usually use :P To me it reads "proceed as normal, unless the path is /batch in which case, go on"
Sorry for the nitpicking on a very interesting episode
Very interesting episode, I'm just trying to implement this idea in my rails app to improve performance.
However Ryan's middleware fails if some of batch requests has status other than 200, e.g. 404:
this error comes from last line of 'process_request' method.
I changed that line to:
{status: status, headers: headers, body: (status == 200 ? body.join : nil)}and it seems to work, but I'm not sure if this is bulletproof, so I will appreciate any thoughts on this
May be you should convert ActionDispath to Array or String.
I tried making it an array. It works. But It seems to be hacky. What exactly are we fixing?
Rack responses are not required to define
join, onlyeach. To ensure all responses are handled correctly by the middleware you can change it to:response_body = '' body.each{|bod| response_body << bod } response_bodyDid Ryan do a railscast on building this javascript task list? If so, which one was it? Many thanks.
I don't believe Ryan has done one that focuses on just creating the to do list, but some good example of similar behaviour is when he was going through various javascript frameworks.
In Backbone.js
http://railscasts.com/episodes/323-backbone-on-rails-part-1
http://railscasts.com/episodes/325-backbone-on-rails-part-2
In Ember:
http://railscasts.com/episodes/408-ember-part-1
http://railscasts.com/episodes/410-ember-part-2
In AngularJS:
http://railscasts.com/episodes/405-angularjs
Search and tags will give you more suggestion.
Just for the record, I just found this gem:
https://github.com/arsduo/batch_api
Really nice!
This is a very interesting technique. I love seeing new ideas for how middleware can be used. This suites the online/offline problem very well. I didn't use this for my bulk/batch API personally because I needed to better tune performance, but I can see how this could be very useful. Thanks, Ryan.
What did you end up using if you don't mind me asking?
Interesting and useful episode, thanks!
Has anyone tried testing this with rspec
Hi,
I have a requirement of sending notifications weekly for my site https://wikigurus.com/ where i need to send emails to many users at a time. Can this Batch API applicable to send requests for bulk emails?. Will it give any performance improvement?
Thanks for sharing this great info with us as I am operating many of social sites pages like moviestarplanethacked.net and therefore I need of something that could help me to trigger multiple actions at the same time as it is quite time consuming to get things done one by one.
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I really love to read such a nice article. Thanks!Keep rocking.
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Interesting post. I Have Been wondering about this issue, so thanks for posting.
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Thanks for providing such a wonderful episode man
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