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• Rails backend: debugging [closed]

  - by banditKing

  I have a rails -API app with Rabl. Im trying to build a photo sharing app. Im getting status 500 codes when my client communicates with the server. Im trying to find out how to debug this. The client is an iOS app I wrote. Where should I begin the debugging process and what are the best tools for debugging rails-api backend apps. Im new to server development so trying to learn the tricks of the trade. Any help would be appreciated. Thanks

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• Bad links point to old domain - should I disavow on new domain?

  - by user32573

  I am working with a site which we'll call www.newdomain.com, which was hit by Penguin this month despite no unusual practices. I found lots of really spammy links to their old site, www.olddomain.com, which 301s to the new domain. So I've gone through the process of identifying which links are really bad, made contact to ask for removal, and am at the stage of disavowing links. But wait! None of the bad links point to newdomain.com, and I worry that a disavow request via this domain in Webmaster Tools will damage something. Do the old band links affect the new site? If so, where do I disavow those old bad links? On Webmaster Tools for the new domain?

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• Hadoop:Only master node does the work

  - by user287722

  I've setup a Hadoop 2.2 cluster with 1 master node(namenode and secondary namenode) and 3 slave nodes(datanode and namenode on each one).All of the machines use Linux Mint 64bit. When I run my MapReduce program, writen in Java, I can only see that master node is using extra CPU and RAM. Slave nodes are not doing a thing. I've checked the logs from all of the namenodes and there is nothing wrong with the namenodes on slave nodes. Resource Manager is running and all of the slave nodes can see the Resource Manager. I used this http://n0where.net/hadoop-2-2-multi-node-cluster-setup/ tutorial to configure my nodes. Datanodes are working in terms of distributed data storing but I can't see any indication of distributed data processing. Do I have to configure the xml configuration files in some other way so all of the machines will process data while I'm running my MapReduce Job?

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• Mimicking a bluetooth disconnection

  - by user2529672

  I've written a program to control a bluetooth device. I'm trying to test cases when the bluetooth disconnects, i.e. if its out of range. Physically taking the device out of range is one possibility, but its quite cumbersome and I have to go outside my office to achieve this. What can I do to trigger a disconnection? Is there, for example, an interferer I can setup, say with an Android phone, that would make the connection drop? Or limit the Bluetooth transmit power? Any other possibilities?

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• Expression Engine vs Drupal for Theming

  - by user793011

  Ive been using Drupal for years and now with work need to learn Expression Engine. Im interested in the comparison of Drupal and Expression Engine, but purely from a theming point of view (Ive no doubt Drupal is more powerful for development). Does anyone have any insights? It seems EE does give you more control over the exact html outputted, but is this necessary? I design my graphics first and Ive always been able to make exactly what I wanted in Drupal (some theme overrides could be easier, but ive got there in the end). Thanks

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• Continuing to code on large projects

  - by user3487347

  I am a hobbyist programmer, and I've started many medium - sized projects to work on just by myself. These include games, a raytracer, physics simulations etc. By the time these projects get to a certain size (around 5000 lines), I begin to slow down in adding features to the program. This is not because of a lack of ideas of what to implement in a program, but rather a struggle in how to go about it. In particular, I'm afraid of breaking what I already have working in order to implement a new feature. I've tried using version control like Git and Subversion, but these seem unnecessary when you are a one man team. I simply have a folder of "versions" of my program, one for each major change I make. How do I keep coding past this 5000 line mark? What about the 50000 line mark?

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• Google Analytics w3wp.exe?

  - by s15199d

  In this link Google defines a Visit. The key part that interests me now, is this: "If a user is inactive on your site for 30 minutes or more, any future activity will be attributed to a new session." Would an idle user (e.g. an employee whose PC is left on over the weekend) record "activity" as a result of the w3wp.exe process recycling? Our site caching model refreshes every 30 minutes. Could this trigger "activity" for an idle user? I've asked this on the Google Analytics forum a week ago and no response.

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• Ubuntu installed accidently on windows

  - by Maz

  I'm new here and would very much appreciate your help I was making a bootable USB to rescue a crashed Ubuntu notebook. I was doing this on my Sony VIo laptop, now I can't access my Sony files, when I boot the Sony up it boots in Ubuntu I think I have overwritten the windows boot sector with Ubuntu I need to either undo the process or if this is not possible then at least recover my kids childhood memory photos Any help to resolve this issue would be very much appreciated P.s I have since removed the hardrive from the Sony and tried to read it on a windows machine as an external drive, windows can see the drive but with no data!

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• Do they ask too much on this job?

  - by user58404

  I am looking for web developer job and this job description caught my eyes. I am not sure how much they offer but I was wondering if anyone here meets all of their requirements? To me, that's a lot of knowledge. 2 to 4+ years experience building web sites and applications in a professional environment Strong working knowledge of HTML5 and CSS3 Strong working knowledge of JavaScript, jQuery, AJAX Working knowledge of Ruby on Rails or similar MVC framework Working knowledge of ExpressionEngine, Wordpress or similar CMS Experience administering a LAMP-based server Experience with cross-platform and cross-browser website testing Comfortable working with version control (preferably Git) Proficient with Adobe Photoshop, Illustrator, and Fireworks Comfortable working on a Mac Self-starter with excellent time-management skills with the ability to meet challenging deadlines Ability to work independently with minimal supervision Desire to work on a small team Bonus Skills: Experience deploying to Heroku or similar PaaS provider. Experience developing Facebook applications A strong sense of design Cool open source projects (send us your Github account!) Advanced working knowledge of server administration and website deployment. Java and/or .NET experience

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• Site returning 404 header to google, not sure why

  - by Damon

  A Drupal site that works fine for regular users returns a 404 not found error when I try to use the W3C validator on it; it is also not being indexed by google at all (which is the main issue but I suspect there is a connection). It is a https:// site with .htaccess rule to redirect any http:// request to the https://. I had had it running in google webmaster tools and thought it was fine, but it turns out I had not added the https domain. After adding the https domain it's also returning the header as HTTP/1.1 404 Not Found Date: Mon, 15 Oct 2012 19:37:43 GMT Server: Apache Expires: Sun, 19 Nov 1978 05:00:00 GMT Cache-Control: no-cache, must-revalidate, post-check=0, pre-check=0 Robots.txt just has User-agent: * Crawl-delay: 10 # Files Disallow: /cron.php How can I check what the issue is here?

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• Four monitor setup with two Nvidia graphics cards

  - by user94329

  I'm running Ubuntu 12.04 and I have two nVidia quadro 2000 video cards, each with two monitors plugged in (all 4 monitors are identical). Now I have the latest nVidia drivers, and I'm trying to use the nVidia control panel to use all four monitors, and I can't get it to work. Currently, my configuration is using TwinView to have 2 monitors per X screen. This doesn't work well because either i turn xinerama on, and nothing appears on the screen when I start a X session with Compiz enabled. Things only work in Ubuntu 2D. i turn xinerama off, and compiz works, but now, I cant drag windows between the two screens and i have no idea how to start applications in the other screen. Is there a better way to configure my four monitor setup? Is there a way to get both GPUs onto a single X screen?

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• Shared memory multiprocesses

  - by poly

  I'm building an multi processes application and I need to save session ID, the sessions ID is 32 bit, and of course it can't be used twice in its lifetime, I'm currently using DB that saves all the ID in a table, and I do the following, ID table is (int key, char used(1)) //1 is used, 0 is not 1. lock table 2. get one key for one sessions 3. update used field in it to used 4. unlock After the session is finished the process use below to free key, 1. lock table 2. update used field in it to not used 4. unlock I'm really wondering whether this is a good/fast implementation. and please note it's multi processes application.

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• How to completely remove Ubuntu?

  - by les02jen17

  I installed Ubuntu using Wubi installer, but I couldnt boot to it. So I uninstalled it on the Control Panel. Then I tried the full installation wherein it boots to the Ubuntu environment. After installing Ubuntu there, I couldnt boot to my Windows 7 anymore! So in an attempt to salvage the whole thing, I inserted the Ubuntu CD again and chose Erase Ubuntu and Reinstall. (I was wondering, why wasn't there an option to just "Erase Ubuntu"?) I did that though, and I got my Windows 7 back. But upon checking my drives via the "Create your own partition scheme" (not sure if it's the exact words) I saw that one of my partitions still has Ubuntu on it, and there's no way I can delete it if I don't overwrite another Ubuntu! I can't access that partition on windows 7 either! Need help!

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• New Layout Features In ASP.NET and WinForms Scheduler Reporting - v2010.1

  Check out these 2 new features of the ASPxScheduler and XtraScheduler that helps you improve appointment layout and display. Quick recap: Our Scheduler controls use the powerful XtraReports Suite for exporting and printing. This gives you added benefits for more flexibility, control and features. Read the 'ASP.NET Calendar SchedulingNew DevExpress Reporting Integration' post to learn more. CanShrink And CanGrow The 2 new layout properties are called CanShrink and CanGrow: CanShrink...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Get/Post Controller Logic Best Practice

  - by Brian Mains

  In an ASP.NET MVC project (Razor), I have a Get request, which loads two properties on a model, dependent on the property passed into the action method. So if the parameter has a value, the Group property is supplied data. But if not, the Groups collection property is supplied data. In the post action method, when I process the data, to repopulate the view, I have to provide similar logic, and could getaway with returning Action(param) (the get response) to the caller. My question is, based on experience, is that a good practice to get into? I see some downsides to doing that, but adds the lack of code redundancy. Or is there a better alternative?

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• Technical website - Should I assume that my visitors will use a modern browser?

  - by marco-fiset

  I am in the process of creating my own website, which will include a technical blog. I want to build my website using modern technologies such as HTML5 and CSS3. Since my website will be targetted at programmers and mostly tech-savvy users, should I take for granted that these people will be using a modern browser? Or should I make my site compatible with older browsers just in case? I don't want to go through the pain of adapting my website to be compatible with browsers I assume won't be used.

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• Technical Article: Experimenting with Java Timers

  - by Tori Wieldt

  OTN's new tech article is "Experimenting with Java Timers" by T. Lamine Ba. This article studies time—how Java handles timers and the scheduling of tasks. Java timers are utilities that let you execute threads or tasks at a predetermined future time, and these tasks can be repeated according to a set frequency. The article starts with a simple "Hello World" program in a web application that's composed of JavaServer Pages (JSP) and uses the model-control-view (MVC) design pattern. The IDE used in this article is NetBeans IDE 7.1, but you can use any IDE that supports Java. "Experimenting with Java Timers" demonstrates how to get started scheduling jobs with Java. To learn about Swing timers, check out the Java tutorial "How to Use Swing Timers" and additional information in the Java Platform, Standard Edition 7 API Specification for Class Timer. 

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• Windows not recognizing its system drive after installing Ubuntu 11.10 alongside with windows 7. What to do?

  - by user53322

  After installing Ubuntu 11.10, it boots perfectly. But when I select Windows 7 from the GRUB menu, it restarts after showing the boot logo. I tried to repair the boot loader but the process failed. Then I decide to repair with system recovery disc. There I realize the system is unable to find any existing system. Then I boot into ubuntu and here I can see all the existing drive (with all content). All drives are still NTFS file system (I have 4 drive: 3 are NTFS another 1 is ext4). Tried to repair with gparted partition tool, but came with no luck. Also tried to reinstall windows but installer don't show any available drive. What to do? (something to do with Ubuntu?)

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• How about a separate partition for home?

  - by August

  using 12.04 . I heard but never tried with /home as a separate partition . what my question is just assume that i have already /home and I'm trying to have a fresh install. so at the installation process what steps I've to take . because my doubts are here . 1 . are we have to select /home also in installation ? or will it do automatically . 2. what about all the configuration files in home . will they load automatically or we have to manually . 3 . if so how we ?

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• processing gamestate with a window of commands across time?

  - by rook2pawn

  I have clients sending client updates at a 100ms intervals. i pool the command inputs and create a client command frame. the commands come into the server in these windows and i tag them across time as they come in. when i do a server tick i intend to process this list of commands i.e. [ {command:'duck',timestamp:350,player:'a'}, {command:'shoot',timestamp:395,player:'b'}, {command:'move', timestamp:410,player:'c'} {command:'cover',timestamp:420,player:'a'} ] how would i efficiently update the gamestate based on this list? the two solutions i see are 1) simulate time via direct equation to figure out how far everyone would move or change as if the real gameupdate was ticking on the worldtick..but then unforseen events that would normally trigger during real update would not get triggered such as powerups or collissions 2) prepare to run the worldupdate multiple times and figure out which commands get sent to which worldupdate. this seems better but a little more costly is there a canonical way to do this?

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• Event Handlers and Automatic Postback in ASP.NET 3.5 Web Controls

  In one of last week s tutorials Creating Database-Driven ASP.NET 3.5 Input and List Web Controls you learned how to create a dynamic input web control that instead of setting values statically stored its list and values directly from the MS SQL server 2 8 database. This tutorial is a sequel to that article. It deals mostly with the server side coding aspect of dynamic web controls. It is recommended that you read the earlier tutorial first as the Visual Web Developer Project in that tutorial will be used extensively in this article.... Download a Free Trial of Windows 7 Reduce Management Costs and Improve Productivity with Windows 7

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• Bridging the gap between learning language fundamentals and actually making useful software?

  - by Anonymous -

  I'm learning C# via the "Essential C#" Lynda.com video tutorials and plan to read a couple of books that cover things in more depth afterwards. My question is where I should head to learn more after that? I've done things like project Euler in the past, but I find they don't really help me learn anything other than basic program control flow and features. I've looked at many open-source projects but pretty much everything still looks overwhelmingly complicated at this stage. What would you recommend I look at to help me build useful applications that are a bit beyond the millions of console applications I must've written thus-far? Should I be looking at books specifically on learning/working with the .NET framework, or just biting my lip and continue working through open source projects until they start to make sense?

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• Why does the use of interface-based programming appear to be limited to behaviour?

  - by Carnotaurus

  I have been doing a little thinking about inheritance vs. realization vs. composition. I am not about to post the whole detail here. So I was wondering, when are not talking about supporting unit testing: Why does interface-based programming seem to focus upon the grouping of common behaviour, e.g., IPettable (for an animal), IEditable (for a user control), ISubmitable (for a form), etc. Why does the use of interface-based programming appear to be limited to behaviour when we could pragmatically group not so much on behaviour but on commonsense physical similarities which could have nothing to do with behaviour? It is not that there is some limiting feature within OOP; so how come?

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• Install failing new hard drives

  - by John

  I'm trying to install Ubuntu server 12.04 on my new hard drives but it seems to fail. Once past the option menu where is asked the partition to install the OS on, goes into a hold and no progress is shown afterwards. The hard disk I'm trying to install it on is: Western Digital WD20EARX The installation process hangs around 'installing core packages/installing the base system' . The CD comes through the test with being valid/ok. any help would be appreciated. Thanks in advance.

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• What language should an 11-year old start with to learn game programming?

  - by emsr

  I have a 11-year old son who wants to do game programming. I've started him on C++ (C++11) and he's learned iostreams, looping, functions, logic and flow control. I'm using the standard library and no memory management at all. But I would like to ask: What language would you suggest for a pre-teen (Python, ...)? What books would you suggest? We looked at one book that was just for console ASCII games. I liked the C++ that it taught but I think he'll get bored without some graphics at some point.

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