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  • Rails: User specific sequential column

    - by Alex Marchant
    I have an inventory system, where a User has many inventory. We have a barcode column which needs to be sequential for each user. I run into a problem however when doing bulk association building. I end up getting several inventories for a user with the same barcode. For example: Inventory Table: id | user_id | barcode 1 | 1 | 1 2 | 1 | 2 3 | 2 | 1 4 | 2 | 2 5 | 1 | 3 In the Inventory model I have before_validation :assign_barcode, on: :create def assign_barcode self.barcode = (user.inventories.order(barcode: :desc).first.try(:barcode) || 0) + 1 end It generally works, but ran into a problem when seeding my db: (1..5).each do user.inventories.build(...) end user.save I end up with a bunch of inventories for user that have the same barcode. How can I ensure that inventories have unique barcodes even when adding inventories in bulk?

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  • unit/integration testing web service proxy client

    - by cori
    I'm rewriting a PHP client/proxy library that provides an interface to a SOAP-based .Net webservice, and in the process I want to add some unit and integration tests so future modifications are less risky. The work the library I'm working on performs is to marshall the calls to the web service and do a little reorganizing of the responses to present a slightly more -object-oriented interface to the underlying service. Since this library is little else than a thin layer on top of web service calls, my basic assumption is that I'll really be writing integration tests more than unit tests - for example, I don't see any reason to mock away the web service - the work that's performed by the code I'm working on is very light; it's almost passing the response from the service right back to its consumer. Most of the calls are basic CRUD operations: CreateRole(), CreateUser(), DeleteUser(), FindUser(), &ct. I'll be starting from a known database state - the system I'm using for these tests is isolated for testing purposes, so the results will be more or less predictable. My question is this: is it natural to use web service calls to confirm the results of operations within the tests and to reset the state of the application within the scope of each test? Here's an example: One test might be createUserReturnsValidUserId() and might go like this: public function createUserReturnsValidUserId() { // we're assuming a global connection to the service $newUserId = $client->CreateUser("user1"); assertNotNull($newUserId); assertNotNull($client->FindUser($newUserId); $client->deleteUser($newUserId); } So I'm creating a user, making sure I get an ID back and that it represents a user in the system, and then cleaning up after myself (so that later tests don't rely on the success or failure of this test w/r/t the number of users in the system, for example). However this still seems pretty fragile - lots of dependencies and opportunities for tests to fail and effect the results of later tests, which I definitely want to avoid. Am I missing some options of ways to decouple these tests from the system under test, or is this really the best I can do? I think this is a fairly general unit/integration testing question, but if it matters I'm using PHPUnit for the testing framework.

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  • Using XSLT for messaging instead of marshalling/unmarshalling Java message objects

    - by Joost van Stuijvenberg
    So far I have been using either handmade or generated (e.g. JAXB) Java objects as 'carriers' for messages in message processing software such as protocol converters. This often leads to tedious programming, such as copying/converting data from one system's message object to an instance of another's system message object. And it sure brings in lots of Java code with getters and setters for each message attribute, validation code, etc. I was wondering whether it would be a good idea to convert one system's XML message into another system's format - or even convert requests into responses from the same system - using XSLT. This would mean I would no longer have to unmarshall XML streams to Java objects, copy/convert data using Java and marshall the resulting message object to another XML stream. Since each message may actually have a purpose I would 'link' the message (and the payload it contains in its properties or XML elements/attributes) to EXSLT functions. This would change my design approach from an imperative to a declarative style. Has anyone done this before and, if so, what are your experiences? Does the reduced amount of Java 'boiler plate' code weigh up to the increased complexity of (E)XSLT?

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  • FTP from batch file

    - by Buzkie
    I'm trying to use a batch file to download a package off my FTP server. echo username >ftp.txt echo >>ftp.txt echo cd directory >>ftp.txt echo get filename >>ftp.txt ftp -s:ftp.txt server.com The server is set to allow anonymous logins on username but when I run the script I get an error: 331 Password required for username If there is any other useful information let me know. -Alex

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  • how to use rsync over ftp

    - by bumperbox
    debian4 linux i have the following cmd line which works fine rsync -avr -e ssh /home/dir [email protected]:/home/ but i need to setup it up now to rsync to a remote server that only has ftp on it how do i go about that ? i looked at the rsync help but quickly got lost (i don't do this stuff very often) thanks alex

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  • Setting udev rules in Linux Mint 13

    - by user1233963
    What I'm trying to do is set up a udev rule for my HP headphones (usb) with the aid of several tutorials out there. Created a file ( 90-local.rules ) in /etc/udev/rules.d and added the following: ACTION="add",SUBSYSTEM="usb", ATTR{vendor}=="Hewlett-Packard", RUN+="sh /home/alex/Scripts/usb.sh" The problem is nothing happens when I connect the headphones! What am I doing wrong? note: I did restart udev and the script works also, so it's not that

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  • Freshy Ubuntu 12.10 install (Newbie)

    - by Alexander Marcev
    Hi i just installed ubuntu 12.10 on my ssd(picture below) and i set up my home directory to the 1 TB disc(picture below). I want in general use the ssd as my root folder as u can see, and install only the apps which are necessary. Games and other stuff goes to the 1 TB disc, but this disc shows me in gparted a usage of 14 GB on a freshly install, whats wrong? What about the ssd, do i have to manually optimize things? thx Alex PS: What if i want to install a Game to my home folder, i heard sth. of a symbol link, how to do that?

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  • Bar Table Modded Into Standing Desk

    - by Jason Fitzpatrick
    This polished looking standing desk combines a stand alone bar-height counter with extra storage, cable management, and monitor riser. The end result looks like a $$$$ standing desk at a fraction of the price. Courtesy of IKEA hacker Marc Marton, the build combines the Billsta Bar Table, the Ekby Alex Shelf, and Besta legs to raise the shelf up off the desk and create a keyboard storage area. For more information about the build hit up the link below. Billsta Bar Table into Standing Work Station [IKEAHacker] 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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  • Setting effects variables in XNA

    - by Badescu Alexandru
    Hello ! I am currently reading a book named "3D Graphics with XNA Game Studio 4.0" by Sean James and have some questions to ask : If i create a effect parameter named lets say SpecularPower and have in my effect a variable named SpecularPower , if i do something like effect.Parameters["SpecularPower"].SetValue(3) That wil change the SpecularPower variable in my effect ? And a second question, not regarding the book : If i have a spaceship and i've created a "boost" functionality that speeds up my spaceship, what effects should i implement to create the impresion oh high speed ? I was thinking of making everything except my spaceship blurry but i think there would be something missing . Any ideas ? Regards, Alex Badescu

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  • The Effects of Caffeine [Video]

    - by Jason Fitzpatrick
    Whether in a cup, a can, or a little bottle, millions of us slug back caffeinated beverages everyday. Check out this video to see how it effects your brain and why it keeps you alert. Courtesy of Alex Dainis at Bite Sci-zed, we’re treated to a rather energetic look at the function of caffeine in the body. Caffeine!! – Bite Sci-zed [via Geeks Are Sexy] How To Delete, Move, or Rename Locked Files in Windows HTG Explains: Why Screen Savers Are No Longer Necessary 6 Ways Windows 8 Is More Secure Than Windows 7

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  • How to implement Cache in web apps?

    - by Jhonnytunes
    This is really two questions. Im doing a project for the university for storing baseball players statitics, but from baseball data I have to calculate the score by year for the player who is beign displayed. The background is, lets say 10, 000 users hit the player "Alex Rodriguez", the application have to calculate 10, 000 the A-Rod stats by years intead of just read it from some where is temporal saved. Here I go: What is the best method for caching this type of data? Do I have to used the same database, and some temporal values on the same database, or create a Web Service for that? What reading about web caching so you recommend?

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  • Google I/O 2010 - Keynote Day 1

    Google I/O 2010 - Keynote Day 1 Google I/O 2010 - Keynote Day 1 Video footage from Day 1 keynote at Google I/O 2010 Vic Gundotra, Engineering Vice President, Google Sundar Pichai, Vice President, Product Management, Google Charles Pritchard, Founder, MugTug Jim Lanzone, CEO, Clicker Mike Shaver, VP Engineering, Mozilla Corporation Håkon Wium Lie, CTO, Opera Software Kevin Lynch, CTO, Adobe Systems Terry McDonell, Editor, Sports Illustrated Group Lars Rasmussen, Manager, Google Wave David Glazer, Engineering Director, Google Paul Maritz, President & CEO, VMware Ben Alex, Senior Staff Engineer, SpringSource Division of VMware, Bruce Johnson, Engineering Director, Google Kevin Gibbs, Software Engineer, Google For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 2 1 ratings Time: 02:05:08 More in Science & Technology

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  • How to safely collect bank account from website?

    - by Alexandru Trandafir Catalin
    I want to collect bank account information from my customers on my website. I'd like to do that trough a form, then I will download it to a PC, print it, and then delete it from the website. Or eventually, send it somewhere external right after the user submitted the form so it never gets stored on the website. The goal is to recieve the payment information without having to ask the customer to print, fill manually, and send it over fax. And accomplish this without having to use an external payment gateway. Thank you, Alex.

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  • Smartassembly 5: it lives! Early Access builds now available

    - by Bart Read
    I'm pleased to announce that, late last week, we put out the first early access build for Smartassembly 5, Red Gate's fantastic code protection and error reporting tool, which we acquired last September. You can download it via: http://www.red-gate.com/messageboard/viewforum.php?f=116 It's obviously pretty early days, so please do not try to use this to protect a production application, but we've already done a lot of work in some key areas: We're simplifying and streamlining the licensing model (you won't see this yet, but a lot of the work on this has already been done). We've improved usability of the product, with a better menu, reordering of project settings, and better defaults. We've also fixed a load of bugs, which I'll let Alex blog about in more detail. On a slightly more trivial level, the curly braces are also no more. Over the coming weeks, we'll be adding more improvements, and starting usability tests. If you're interested in getting involved in the latter, please drop an email to [email protected].

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  • Split a text file by its entries

    - by Alexx Hardt
    Hi, I'm trying to analyze an enormous text file (1.6GB), whose data lines look like this: 20090118025859 -2.400000 78.100000 1023.200000 0.000000 20090118025900 -2.500000 78.100000 1023.200000 0.000000 20090118025901 -2.400000 78.100000 1023.200000 0.000000 I don't even know how many lines there are. But I'm trying to split the file by date. The left number is a time stamp (these lines are from 2009, January 18th). How can I split this file into pieces according to the date? Everything I know would be to grep file '20090118*' > data20090118.dat , but there sure is a way to do all the dates at once, right? The number of entries per date differ, so using split with a constant number won't work. Thanks in advance, Alex

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  • GDD-BR 2010 [1H] VC Panel: Entrepreneurship, Incubation and Venture Capital

    GDD-BR 2010 [1H] VC Panel: Entrepreneurship, Incubation and Venture Capital Speakers: Don Dodge, Eric Acher, Humberto Matsuda, Alex Tabor Track: Panels Time slot: H [17:20 - 18:05] Room: 1 Startups can be built and funded anywhere in the world, not just Silicon Valley. Venture Capital investors are investing in startups globally, and funding incubators to hatch their future investments. Find out how you can get into an incubator, or funded by a Venture Capitalist or Angel Investors. Learn from examples in the USA and hear from local VC investors in this panel discussion. Get your questions answered by real investors. From: GoogleDevelopers Views: 6 0 ratings Time: 37:39 More in Science & Technology

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  • Google I/O 2012 - Advanced Design for Engineers

    Google I/O 2012 - Advanced Design for Engineers Alex Faaborg, Christian Robertson Design isn't black magic, it's a field that people can learn. In this talk two elite designers from Google will give you an advanced crash course in interactive and visual design. Topics will include mental models, natural mappings, metaphors, mode errors, visual hierarchies, typography and gestalt principles. Correctly applied this knowledge can drastically improve the quality of your work. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 158 9 ratings Time: 55:50 More in Science & Technology

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  • Les développeurs détestent-ils les antivirus ? Un programmeur manifeste sa haine envers ces solutions de sécurité

    Les développeurs détestent-ils les antivirus ? Un programmeur manifeste sa haine envers ces solutions de sécurité « Je déteste les antivirus ». C'est par ces mots que Alex Yumashev, un développeur .NET révèle dans un billet de blog pourquoi il déteste les antivirus. Ces logiciels dont la mission principale est l'identification, la neutralisation et la suppression des programmes malveillants sont quelques fois des sources de problèmes pour les développeurs lors des tests ou de l'utilisation de leurs applications qui sont identifiées comme des menaces. Ymashev explique que malgré la signature de son application avec un certificat de confiance Verisign, malgré qu'elle ait été ...

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  • Why 'nobody' always starts a new `find` program that always consume my memory?

    - by UniMouS
    $ ps -elf | grep ... 0 D nobody 27320 27319 2 90 10 - 353471 sleep_ 07:54 ? 00:02:19 /usr/bin/find / -ignore_readdir_race ( -fstype NFS -o -fstype nfs -o -fstype nfs4 -o -fstype afs -o -fstype binfmt_misc -o -fstype proc -o -fstype smbfs -o -fstype autofs -o -fstype iso9660 -o -fstype ncpfs -o -fstype coda -o -fstype devpts -o -fstype ftpfs -o -fstype devfs -o -fstype mfs -o -fstype shfs -o -fstype sysfs -o -fstype cifs -o -fstype lustre_lite -o -fstype tmpfs -o -fstype usbfs -o -fstype udf -o -fstype ocfs2 -o -type d -regex \(^/tmp$\)\|\(^/usr/tmp$\)\|\(^/var/tmp$\)\|\(^/afs$\)\|\(^/amd$\)\|\(^/alex$\)\|\(^/var/spool$\)\|\(^/sfs$\)\|\(^/media$\)\|\(^/var/lib/schroot/mount$\) ) -prune -o -print0 ... This job always start automatically and consumes my memory. Even after I kill it, it will starts several hours later. What's that job? EDIT Note: the pid is different from the above because I killed the above one, wait for several hours, then the second one comes. $ pstree -psl |-anacron(25920)---sh(25929)---run-parts(25930)---locate(26343)---updatedb.findut(26348)-+-frcode(26358) | |-sort(26357) | `-updatedb.findut(26356)---su(26387)---sh(26402)---find(26403) This is what it look like in a graphical tool:

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  • Behavior tree implementation details

    - by angryInsomniac
    I have been looking around for implementation details of behavior trees, the best descriptions I found were by Alex Champarand and some of Damian Isla's talk about AI in Halo 2 (the video of which is locked up in the GDC vault sadly). However, both descriptions fall short of helping one actually create a BT, one particular question has been bugging me for a while. When is the tree in a behavior tree evaluated? Furthermore: If the tree is in the middle of executing a sequence of actions (patrolling waypoints) and a higher priority impulse comes in (distraction sound) , how to switch to that side of the tree seamlessly without resorting to a state machine like system and if it is decided that the impulse was irrelevant (the distraction is too far away to affect this guard), how to go back to the last thing that the guard was doing ? I have quite a few questions like this and I don't wish to flood the board with separate queries so if you know of any resource where questions like these can be answered I would be very grateful.

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  • Dependency problem while missing package is already installed

    - by hakermania
    I am trying to install a program but I am getting a dependency error. The error clearly points out: Dependency is not satisfiable: libc6-amd64 (>= 2.14) I went on to investigate and I found out that I have 2.19 version installed, actually: alex@MaD-pc:~$ apt-cache policy libc6-amd64 libc6-amd64:i386: Installed: 2.19-0ubuntu6 Candidate: 2.19-0ubuntu6 Version table: *** 2.19-0ubuntu6 0 500 http://us.archive.ubuntu.com/ubuntu/ trusty/main i386 Packages 100 /var/lib/dpkg/status Why am I getting this error if I already have this package? I also should probably mention that the system is 100% up to date. I run the updates and upgrades, restarted the system and then tried to install the package again with the same error popping up. Edit 1: I am using amd64 but I have installed some 32-bit libraries required by some program installed via wine if I recall correctly.

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  • Contiguous Time Periods

    It is always more efficient to maintain referential integrity by using constraints rather than triggers. Sometimes it isn't obvious how to do this. Until a recent idea by Alex Kuznetsov, the history table presented problems for checking data that were difficult to solve with constraints. Joe Celko explains. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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  • Google I/O 2012 - The Web Platform's Cutting Edge

    Google I/O 2012 - The Web Platform's Cutting Edge Dimitri Glazkov, Alex Komoroske From embeds to widgets to managing complex applications, you constantly face the need for better componentization as a web developer. Many-a-lines of JavaScript have been written to alleviate this problem -- poorly. But help is on the way. The web platform is gaining a powerful new set of capabilities designed to better help you build robust, reusable, and packageable components. We'll cover what they do, their status, and how you can start playing with these powerful emerging technologies today. Most importantly, we'll show you how to get involved and help influence their direction as they mature. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 2795 48 ratings Time: 47:45 More in Science & Technology

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