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• How to reduce latency of data sent through a REST api

  - by Sid

  I have an application which obtains data in JSON format from one of our other servers. The problem I am facing is, there is is significant delay when when requesting for this information. Since a lot of data is passed (approx 1000 records per request where each record is pretty huge) is there a way that compression would help reducing the speed. If so which compression scheme would you recommend. I read on another thread that they pattern of data also matters a lot on they type of compression that needs to be used. The pattern of data is consistent and resembles the following :desc=>some_description :url=>some_url :content=>some_content :score=>some_score :more_attributes=>more_data Can someone recommend a solution to how I could reduce this delay. They delay is approx 6-8 seconds. I'm using Ruby on Rails to develop this application and the server providing the data uses Python for the most part.

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• Running Test framework as part of application

  - by VP

  Hi, I would like to know if it is possible in rails to run some test cases through my application. I mean, i want show the test results to users. So i was thinking to be able to call my tests through a controller and put the tests output in a dialog. Imagine that i'm doing an application where before to apply a rule, i want to run some validation tests. I could write methods in my rule model to do it, but i would like to use something like shoulda or any other kind of DSL where the "fixture" would be a record itself. Any tip or idea?

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• Nested form child only updates if parent changes.

  - by chap

  In this video (10 sec) you can see that the nested attribute is only updated if it's parent model is changed. Using rails 3.0.0.beta and full project is on github. Summary of models and form: class Project < ActiveRecord::Base has_many :tasks accepts_nested_attributes_for :tasks end class Task < ActiveRecord::Base belongs_to :project has_many :assignments accepts_nested_attributes_for :assignments end class Assignment < ActiveRecord::Base belongs_to :task end form_for(@project) do |f| Project: f.text_field :name f.fields_for :tasks do |task_form| Task: task_form.text_field :name task_form.fields_for :assignments do |assignment_form| Assignment: assignment_form.text_field :name end end f.submit end

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• Trying to get paperclip to refresh or reprocess..

  - by Trip

  I have over time, changed the size for thumbs of the class Deal. Through these changes, users were uploading to the site, so there are few people who have different sized thumbs. I wanted to reprocress or refresh these, so I went to into my root and typed: $ rake paperclip:refresh class=Deal Did nothing for the thumb sizes.. Then I : irb Deal.find(987).reprocess! Returned this : NoMethodError: undefined method `reprocess!' for #<Deal:0xb68a0988> from /data/HQ_Channel/releases/20100607130346/vendor/rails/activerecord/lib/active_record/attribute_methods.rb:260:in `method_missing' from (irb):7 My deal class is this : => Deal(id: integer, organization_id: integer, deal: string, value: string, what: string, description: string, image_file_name: string, image_content_type: string, image_file_size: integer, image_updated_at: datetime, created_at: datetime, updated_at: datetime, deal_image_file_name: string, deal_image_content_type: string, deal_image_file_size: integer, deal_image_uploaded_at: datetime) What can i do to have it reprocess the original to make the thumb the correct size in the current thumb size params?

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• Multiple row insertion in a faster way

  - by Cyborgo

  Hi, I am using rails and I am trying to insert new rows into the table. The data comes from a text file and I created hash with one of the attribute as key. Then I find all the keys that are currently not in the table. Then I need to insert all of them into the table with all the attributes that I saved in hash. newvals.each{ |x| author = Author.create(:first => x, :second => hash[x][0], :third => hash[x][1]) author.save } This has lot of overhead as it makes an SQL update one at time. The newals array is usually quite big around the size of 20-30k. I know create can insert multiple objects at once, but I cant seem to figure out how. Is there any way to get this done. Thanks.

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• Internet Explorer 8 doesn't finish downloading the page!

  - by Eric the Red

  I'm currently finishing up testing a new Ruby on Rails app. Just recently, some of the pages do not seem to finish downloading in IE8. In FireFox, Chrome and Safari, everything works perfectly. The pages all validate successfully using the W3C validator. When I view the page source in IE8, the page has been chopped off around 75% of the size it should be. IE8 claims the page is finished loading, and doesn't give any errors, but of course the page isn't rendering properly. Has anyone seen this before? I'd really appreciate any help.

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• $.ajax + authentication + `@` in username

  - by Koning Baard XIV

  I am creating a web app which uses jQuery to authenticate: $.ajax({ url: "/session/create?format=json", type: "GET", dataType: "json", cache: false, username: $("#signin-email").val(), password: $("#signin-password").val(), success: function(data) { if(data.success) { success = true; } } }); The problem is that the code only makes the AJAX-request when the username does not include things like an @, which is required in my app. Can anyone help me with how I can do this? I do not mind changing the back-end a little bit, but requiring users to have an @-less email is not an option. Oh, my back-end is a Ruby-on-Rails app

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• Implementing an Online Waiting Room

  - by saalon

  My organization is building a new version of our ticketing site and is looking for the best way to build an online waiting room when the number of users in our purchase path exceeds a certain limit. The best version of this queue would let new users in after existing users have either completed their purchase or have exceeded a timeout limit after entering the path. I'm trying to get an idea of how this has been implemented by other organizations. Has anyone out there done something similar or have any experience with this? We have some ideas, but I'd like to get a sense of what solutions have been tried and what problems those solutions have run up against. Just to be complete, this site is being built in Ruby on Rails, though I'd love to hear about how people have solved this regardless of platform.

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• Updating cached counts in MySQL

  - by phleet

  In order to fix a bug, I have to iterate over all the rows in a table, updating a cached count of children to what its real value should be. The structure of the things in the table form a tree. In rails, the following does what I want: Thing.all.each do |th| Thing.connection.update( " UPDATE #{Thing.quoted_table_name} SET children_count = #{th.children.count} WHERE id = #{th.id} " ) end Is there any way of doing this in a single MySQL query? Alternatively, is there any way of doing this in multiple queries, but in pure MySQL? I want something like UPDATE table_name SET children_count = ( SELECT COUNT(*) FROM table_name AS tbl WHERE tbl.parent_id = table_name.id ) except the above doesn't work (I understand why it doesn't).

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• Associate a URL with a resource within my application

  - by Horace Loeb

  When I visit http://my-application.com/posts/1 in my browser, Rails knows I'm looking for the Post with id = 1. How can I get my application to do this internally? I.e., I'd like a function (call it associate_with_resource) that takes a string containing a URL as its input and outputs the associated resource. For example: >> associate_with_resource('http://my-application.com/posts/1') => #<Post id: 1, ... > (I'd like to be able to use associate_with_resource throughout my application though -- not only in the console)

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• Does the '#' modifier for cropping images in Paperclip work only for square images?

  - by user3451384

  It is very well documented that you can create square thumbnails with center cropping with Paperclip (4) and Rails (4). I would like to have an image of very specific dimensions (e.g. 200x100) and if input an image of let's say 800x200 it is first resized to 400x100 and then the width (400) is cropped down to 200 pixel from the center (i.e. 100px cut from the right and 100 px cut from the left). I tried with 200x100# and it does not appear to work (i.e. the '#' has no effect). I have found that I could adapt other solutions such as this, but I was wondering if '#' is supposed to work only for cropping to square images, or is a Paperclip bug or I am doing something wrong...

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• Do you think that exposure to BASIC can mutilate your mind? [closed]

  - by bigown

  It is practically impossible to teach good programming to students that have had a prior exposure to BASIC: as potential programmers they are mentally mutilated beyond hope of regeneration -- Edsger W. Dijkstra I have deep respect to Dijkstra but I don't agree with everything he said/wrote. I disagree specially with this quote on linked paper wrote 35 years ago about the Dartmouth BASIC implementation. Many of my coworkers or friends programmers started with BASIC, questions below have answers that indicate many programmers had their first experience on programming at BASIC. AFAIK many good programmers started at BASIC programming. I'm not talking about Visual Basic or other "modern" dialects of BASIC running on machines full of resources. I'm talking about old times BASIC running on "toy" computer, that the programmer had to worry about saving small numbers that need not be calculated as a string to save a measly byte because the computer had only a few hundreds of them, or have to use computed goto for lack of a more powerful feature, and many other things which require the programmer to think much before doing something and forcing the programmer to be creative. If you had experience with old time BASIC on a machine with limited resources (have in mind that a simple micro-controller today has much more resources than a computer in 1975, do you think that BASIC help your mind to find better solutions, to think like an engineer or BASIC drag you to dark side of programming and mutilated you mentally? Is good to learn a programming language running on a computer full of resources where the novice programmer can do all wrong and the program runs without big problems? Or is it better to learn where the programmer can't go wrong? What can you say about the BASIC have helped you to be a better/worse programmer? Would you teach old BASIC running on a 2KB (virtual) machine to a coming programmer? Sure, only exposure to BASIC is bad. Maybe you share my opinion that modern BASIC doesn't help too much because modern BASIC, as long other programming languages, gives facilities which allow the programmer doesn't think deeper. Additional information: Why BASIC?

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• How can you explain "beautiful code" to a non-programmer?

  - by Daniel Vandersluis

  When speaking with a non-programmer friend, I happened to mention the concept of "beautiful code" and she wanted to understand what that meant, but I was at a bit of a loss as to how to explain it to someone who would have no context whatsoever. When all code looks like gibberish to someone anyways, how can you explain what makes one piece of code prettier than another? Analogies could be useful too.

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• What change in mindset are needed for a Jave/C# programmer when learning Swift?

  - by Ian

  Swift seem to fit into the same “space” as Java/C# as it was created to make it easier to create end user applications. It is also used to target smart phones like Java/C#. However reading it’s documentation it seems to come from anther universe, you could say it is from Jupiter while C#/Java is from Saturn. As a C# programmer I am finding myself making assumptions that are not true, so what are the conceptual “traps” that I should look out for while leaning about Swift?

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• Does relying on intellisense and documentation a lot while coding makes you a bad programmer? [duplicate]

  - by sharp12345

  This question already has an answer here: Forgetting basic language functions due to use of IDE, over reliance? [duplicate] 4 answers Is a programmer required to learn and memorize all syntax, or is it ok to keep handy some documentation? Would it affect the way that managers look at coders? What are the downside of depending on intellisense and auto-complete technologies and pdf documentation?

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• As a programmer, what would you use a personal Wiki for?

  - by Adam Harte

  Do any programmers out there keep a personal wiki? Either locally or online. What do you use your wiki for? or what might you use one for? I was thinking of starting a personal wiki as a place to record documentation and and other documents for my personal projects, and various notes etc, but how else is a personal (maybe private) Wiki useful to a programmer/developer? What type of things would you put in a personal Wiki?

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• Do you have to be good at math to be a good programmer?

  - by Charles Roper

  It seems that conventional wisdom suggests that good programmers are also good at math. Or that the two are somehow intrinsically linked. Many programming books I have read provide many examples that are solutions to math problems, or are somehow related to math as if these examples are what make sense to most people. So the question I would like to float is: do you have to be good at math to be a good programmer?

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• Can you be a manager and a programmer at the same time?

  - by Pierre 303

  Managing other programmers while you are yourself a part of the programming work force. It's a very common scheme, at least in the companies I worked for. Can you be a good programmer or a good manager if you do both at the same time? I'm questioning the effectiveness of an individual that has to be in two very different roles, requiring very different skills, environment, concentration, organization, etc.

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• Can a 20 years old programmer who has been programming daily since 10 get a job that will pay for what he knows?

  - by Dokkat

  I'm a programmer who has been programming daily since I was 10-years-old. Is it possible to get a job with a salary that reflects my programming knowledge, or do I have to be in the same place as someone starting just now, as I've never had an actual job? I am not sure if this kind of question is allowed here and could not find out. If it is not, could you kindly suggest a place to ask this? Sorry for any inconveniences.

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• As a self-taught programmer, how do I get the academic foundation without attending school again?

  - by hal10001

  I've made a pretty good living as a self-taught programmer, but when I find that I discuss some low-level fundamental topics with my peers who have a CS degree, holes appear in my knowledge. I'm a big picture (architecture) guy, so for a long time this hasn't bothered me, but lately I've wondered if there is an approach I can take that will help me learn these fundamentals without going back to school? Are there books, websites or videos that you can recommend that would give me a ground-up perspective as opposed to a learn it as you need it mentality?

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• Does a good programmer need to have good spatial sense?

  - by user297318

  Do you need to have good spatial sense to be a good programmer? I have next to nothing of it (I think it has to do with the differing vision of my eyes). I've already coded quite little things but wonder if this interferes with the ability to 'imagine' the assembly of the code in case of a more complex program? Sorry for my english, I'm Austrian and not so used to write in English.. Thanks for your ansers..

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• What is the most professional way to deal with another programmer who has checked out mentally?

  - by hal10001

  Lead... same project I'm on... shows decreasing interest in project work, especially lead activities. This has been going on for awhile now, and some animosity is starting to grow between us based upon decisions made and overall attitude toward client interactions and tasks. This person is not necessarily a bad programmer, but I can tell is mentally checking out and shutting down. Generally speaking, how do you deal with this behavior?

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• Is it possible to become a successful programmer without studying CS? [closed]

  - by alexganose

  Possible Duplicate: Can One Get a Solid Programming Foundation Without Going To College/University? I am a student at University College London, I'm not studying computer science but I have a massive interest in computer science. I am studying Natural Sciences which means that I study Chemistry, Biology and Maths. I'm not necessarily asking this question for my specific case but what are you opinions? Is it a viable career choice to become a programmer without a computer science degree?

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• Full Time PHP Programmer Or Fixed Cost? What Model is Good For You?

  I have tried to differentiate two models of outsourcing projects with their advantages and disadvantages. One can assign a fixed cost PHP programming project or one can hire a full time PHP programmer for one or more projects.

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• Doit-on apprendre aux plus jeunes à programmer ? Un journaliste trouve cette idée ridicule

  Doit-on apprendre aux plus jeunes à programmer ? Un journaliste trouve cette idée ridiculeEst ce vraiment une bonne idée que d'avoir à enseigner la programmation aux plus jeunes ? Chacun a sa propre opinion sur la question. Pour le Royaume-Uni, la réponse est affirmative. Vu les nombreuses opportunités qu'offre l'informatique dans le domaine de l'emploi, pour le gouvernement Britannique il est impératif de familiariser les plus jeunes à l'informatique le plus tôt possible.Pour Willard Foxton journaliste...

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