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• rails3, gridfs and mongomapper: how to serve files? send_data?

  - by z3cko

  i am currently developing a rails3 app with mongomapper and file storage in gridfs. after some trying around, i found grip and currently also use it in the app for storing the data. so far, so good - now i am trying to get my head around serving the files to the user -- what would be the best/fastest way to achieve that? from: http://railstips.org/blog/archives/2009/12/23/getting-a-grip-on-gridfs/ there seem to be 2 ways: send_data from ruby/rails - is this a recommended way? fast enough? (i want to use passenger in the deploy setup) writing a rails metal (see http://gist.github.com/264077) - any comments or hints on how to use that with rails3? any other ideas or even examples? thanks a lot!

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• Does there exist a jQuery plugin or JavaScript library that allows Venn Diagram presentation?

  - by knowncitizen

  I'm writing a jQuery application to allow analysis of data with the help of visual cues. My data is retrieved via XMLHttpRequest in the form of JSON. The visual cues include histograms, spark lines, and various other graph types. The idea is that the user is able to narrow their data via these various visual views. My question is thus - aside from the Google Charts API, does there exist a JavaScript way of presenting a Venn Diagram? Requirement: no Flash. Canvas is acceptable.

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• using WP_Query with custom SQL in wordpress

  - by Matt Facer

  Hi. I am writing a plugin for wordpress and I want to create my own search. I have tried to alter the wordpress search, but what I am doing is very specific with the SQL query. I am comparing lat and long coordinates and getting posts based on that. I can display posts by using the standard wpdb query, but then I don't get the other features like paging. I'd like to be able to use my SQL statement with the WP_Query function. If I'm right in thinking, I should then be able to use the paging and other features which come from the $posts global variable. Is this right?? I've googled for hours but can't find anything for plugins outside of using args to select categories etc. I simply need to send a complete SQL command - nothing else. Many thanks....

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• Python "Every Other Element" Idiom

  - by Matt Luongo

  Hey guys, I feel like I spend a lot of time writing code in Python, but not enough time creating Pythonic code. Recently I ran into a funny little problem that I thought might have an easy, idiomatic solution. Paraphrasing the original, I needed to collect every sequential pair in a list. For example, given the list [1,2,3,4,5,6], I wanted to compute [(1,2),(3,4),(5,6)]. I came up with a quick solution at the time that looked like translated Java. Revisiting the question, the best I could do was l = [1,2,3,4,5,6] [(l[2*x],l[2*x+1]) for x in range(len(l)/2)] which has the side effect of tossing out the last number in the case that the length isn't even. Is there a more idiomatic approach that I'm missing, or is this the best I'm going to get?

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• Using sed for introducing newline after each > in a +1 gigabyte large one-line text file

  - by wasatz

  I have a giant text file (about 1,5 gigabyte) with xml data in it. All text in the file is on a single line, and attempting to open it in any text editor (even the ones mentioned in this thread: http://stackoverflow.com/questions/159521/text-editor-to-open-big-giant-huge-large-text-files ) either fails horribly or is totally unusable due to the text editor hanging when attempting to scroll. I was hoping to introduce newlines into the file by using the following sed command sed 's/>/>\n/g' data.xml > data_with_newlines.xml Sadly, this caused sed to give me a segmentation fault. From what I understand, sed reads the file line-by-line which would in this case mean that it attempts to read the entire 1,5 gig file in one line which would most certainly explain the segfault. However, the problem remains. How do I introduce newlines after each in the xml file? Do I have to resort to writing a small program to do this for me by reading the file character-by-character?

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• MVC in a Google App Engine Java world

  - by thatismatt

  I'm coming to Java from C# & ASP.NET MVC, I'd love to find an equivalent in the Java world that I could use on the Google App Engine. I've already started to have a play with FreeMarker and even made the first steps towards writing a very simple framework. Ideally I wouldn't have to do all the hard work though, someone must have done this already! So my question is - what frameworks are there out there that would be familiar for me coming from ASP.NET MVC and I could use them on Google App Engine for Java. The key things I'd want are: Simple Routing - /products/view/1 gets mapped to the view action of the products controller with the productid of 1 Template Engine - some way of easily passing 'ViewData' to the view, and from the view easily accessing it, ideally I'd love to avoid anything that is too XMLy (thus why I like FreeMarker).

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• Best Fit Scheduling Algorithm

  - by Teegijee

  I'm writing a scheduling program with a difficult programming problem. There are several events, each with multiple meeting times. I need to find an arrangement of meeting times such that each schedule contains any given event exactly once, using one of each event's multiple meeting times. Obviously I could use brute force, but that's rarely the best solution. I'm guessing this is a relatively basic computer science problem, which I'll learn about once I am able to start taking computer science classes. In the meantime, I'd prefer any links where I could read up on this, or even just a name I could Google.

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• Let system time determine animation speed, not program FPS

  - by Anders

  I'm writing a card game in ActionScript 3. Each card is represented by an instance of a class extending movieclip exported from Flash CS4 that contains the card graphics and a flip animation. When I want to flip a card I call gotoAndPlay on this movieclip. When the frame rate slows down all animations take longer to finish. It seems Flash will by default animate movieclips in a way that makes sure all frames in the clip will be drawn. Therefor, when the program frame rate goes below the frame rate of the clip, the animation will be played at a slower pace. I would like to have an animation always play at the same speed and as a consequence always be shown on the screen for the same amount of time. If the frame rate is too slow to show all frames, frames are dropped. Is is possible to tell Flash to animate in this way? If not, what is the easiest way to program this behavior myself?

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• Is there a way to export an XSD schema from a DataContract

  - by Eric

  I'm using DataContractSerializer to serialize/deserialize my classes to/from XML. Everything works fine, but at some point I'd like to establish a standard schema for the format of these XML files independent of the actual code. That way if something breaks in the serialization process I can always go back and check what the standard schema should be. Or if I do need to modify the schema the modification is an explicit decision rather then just a later affect of modifying my code. In addition, other people may be writing other software that may not be .NET based that would need to read from these XML files. I'd like to be able to provide them with some kind of documentation of the schema. Is there some relationship between a DataContract and an XSD schema. Is there a way to export the DataContract attributes in classes as an XSD schema?

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• MS Access Draw line around detail section that can grow

  - by LanguaFlash

  This really shouldn't be hard, I just can't figure out how to do it. I am making a proposal report that needs to have a border around it. The problem is to get the vertical lines on the side. I can't figure out how to get a line to grow and shrink based on the height of the detail section. I have used Crystal reports and sure wish Microsoft would learn a few things in regards to MS Access report writing! I am very comfortable with VBA so have no fears there. :-) Thanks, Jeff

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• How does TransactionScope guarantee data integrity across multiple databases?

  - by Bas Smit

  Hey guys, Can someone tell me the principle of how TransactionScope guarantees data integrity across multiple databases? I imagine it first sends the commands to the databases and then waits for the databases to respond before sending them a message to apply the command sent earlier. However when execution is stopped abruptly when sending those apply messages we could still end up with a database that has applied the command and one that has not. Can anyone shed some light on this? Edit: I guess what Im asking is can I rely on TransactionScope to guarantee data integrity when writing to multiple databases in case of a power outage or a sudden shutdown. Thanks, Bas Example: using(var scope=new TransactionScope()) { using (var context = new FirstEntities()) { context.AddToSomethingSet(new Something()); context.SaveChanges(); } using (var context = new SecondEntities()) { context.AddToSomethingElseSet(new SomethingElse()); context.SaveChanges(); } scope.Complete(); }

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• A metaphor for Drupal module's inner workings

  - by PHP thinker

  What is the best application workflow metaphor for Drupal module? In PHP frameworks we think MVC-style. How do we think inside Drupal? Asumming I am writing some user-oriented module like Shop, Catalog or Forum. As far as I understand there are no or few MVC based modules. Should I generally treat Drupal modules (as sub-application) as a number of screens connected via forms and hyperlinks or there is a better way. My question may be a little bit speculative, but I hope someone will share my intent to think models, not just "scripts".

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• Reading Local Group Policy / Active Directory Settings

  - by Shinobi

  I'm writing a C# program that will enforce password complexity in accordance with the Windows Group Policy setting "Password must meet complexity requirements". Specifically, if that policy is set to Enabled either on the local machine (if it's not part of a domain) or by the Domain Security Policy (for domain members), then my software needs to enforce a complex password for its own internal security. The issue is that I can't figure out how to read that GPO setting. Google searches have indicated that I can read GPO settings with one of these two APIs: the System.DirectoryServices library in .NET Framework, and Windows Management Instrumentation (WMI), but I haven't had any success so far. Any insights would be helpful.

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• What parser generator do you recommend

  - by stefan.ciobaca

  I'm currently shopping for a FOSS parser generator for a project of mine. It has to support either C or C++. I've looked at bison/flex and at boost::spirit. I went from writing my own to spirit to bison to spirit to bison to spirit, each time hit by some feature I found unpleasant. The thing I hate most about bison/flex is that they actually generate C/C++ source for you. There are a number of disadvantages to this, e.g. debugging. I like spirit from this point of view, but I find it very very heavy on syntax. I am curious about what you are using, what you would recommend, and general thoughts about the state of the art in parser generators. I am also curious to hear about approaches being used in other languages for parsing problems.

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• Life Cycle Tools Suite

  - by pearcewg

  I am looking to replace the life cycle tools currently used by my development teams. Tools that I'm looking for: Version Control Defect/Issue Tracking Requirements Tracking Test Case Management (potentially) Project Management: Project Status, hours entry I have a new beefy server (Windows 2008 Server) to run all tools on. I'm looking at COTS and Open Source options, but haven't decided so far. Other factors: Distributed team (different physical sites) Some Windows Development, some Linux Development Software, Firmware, Technical Writing need to be able to use it Recommendations on a good suite that will work together? If Open Source, best approach to run on the Windows 2008 Server?

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• CoffeeScript on Windows?

  - by Nick Perkins

  How can I try CoffeeScript on Windows? The installation instructions are only for *nix: http://jashkenas.github.com/coffee-script/#installation EDIT: I don't think I need node.js -- I am just writing javascript for web pages, (using some jQuery, etc)...So all I really want is simple way to write CoffeeScript and "compile" it down to JavaScript. Isn't there a Ruby program that would do it? Or even better, a windows exe? (i dont use ASP.NET either...i use Python/Django) FINAL EDIT: Thanks for the help -- In the end I installed VirtualBox and created a virtual Linux machine which I now use to program coffeescript with node.js. (It was surprisingly easy to start using VirtualBox -- easier than doing the Cygwin thing). I run jEdit (for which you can get a CoffeeScript syntax highlighter) and I put the corresponding js file side-by-side with the coffeescript file. When I compile the coffeescript to js, the editor automatically re-loads the new javascript, which allows me to check that it has compiled the way I expect (which is a good thing while learning the coffeescript syntax).

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• Eclipse standard warning/error overlay icons

  - by pulzar

  I'm writing an Eclipse plug-in... In my custom label decorator, I want to overlay a warning icon, and I'd like to use the standard one used by eclipse (the little yellow triangle). How can I get an image descriptor of this icon? I tried using workbench.getSharedImages().getImageDescriptor(ISharedImages .IMG_DEC_FIELD_WARNING), since that ID seems to match what I'm looking for, but the shared images collection doesn't actually have that image in it (so I just get a null returned). Is there some other shared image collection that I should be looking at?

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• How to access the Desktop Composition Engine from a WinForms app?

  - by MusiGenesis

  Is it possible to access Desktop Composition Engine in Windows Vista from a winforms application? The DCE apparently involves applications rendering to DCE buffers instead of directly to the screen. Since a winforms app has no way of getting information about the monitor's refresh rate and scanline status (other than via DirectX), animation in a winforms app is subject to tearing effects. With DCE enabled, the tearing effects are lessened but still there (apparently the DCE can still grab a buffer that your app is halfway through writing to and render it to the screen, thereby producing the half-one-frame-half-of-the-next tearing effects). Is there any way for my winforms app to communicate with the DCE and possible avoid rendering during buffer switchover times?

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• Is there a way to make PHP progressively output as the script executes?

  - by Iain Fraser

  So I'm writing a disposable script for my own personal single use and I want to be able see how the process is going. Basically I'm processing a couple of thousand media releases and sending them to our new CMS. So I don't hammer the CMS, I'm making the script sleep for a couple of seconds after every 5 requests. I would like - as the script is executing - to be able to see my echos telling me the script is going to sleep or that the last transaction with the webservice was successful. Is this possible in PHP? Thanks for your help! Iain

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• Did we really always need to use Ruby/ rails plugin?

  - by Devlim

  I been intersted in ruby and rails lately but what I always encounter in blog/ podcast / book is they will always teach how to use ruby or rails plugin/ ruby instead of writing one. Did we really always need to use plugin, even thing like authorization? Authenticate? Is it really waste time Or hard to write from start? Then if it hard and waste time why rails say make web development less painful? Or I was wrong in term of concept? Goal ? Or anything else? Of rails? Anyone can guide me ?

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• how to localize a table with multiple text entries?

  - by rap-uvic

  Hello, I'm writing a web app which will allow creation of events. An event can have a title as well as a description amongst other things. The app needs to be multilingual. So I have 4 tables for localization: ResourceTypes, ResourceKeys, Resources, and Locales. A resource key can have multiple values in Resources table for different locales. So Resources is a many to many table between ResourceKeys and Locales. So in the event table I want to have a resourceKey for its title as well as a resourceKey for its description. So my question is, is it OK from database-design perspective to have two foreign keys from a table into another table? Has anybody used a better approach in such a scenario?

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• javaEE application layout

  - by arthurdent510

  I've been tasked with writing a new webapp in javaEE, which will be a first for me. I'm familar with the java language, but all of my previous projects have been in .net. So I've downloaded netbeans and I'll probably be using Hibernate, and started digging in. My question is, what's the best way to lay out a javaEE app? Should all data access go through netbeans? I was told to use webservices as much as possible so it's easy to pull data in and out of the system, and I've read through tutorials that create webservices in a seperate web application, as compared to the javaEE enterprise application. Is that really the way it's supposed to work? Just trying to wrap my head around this as compared to what I'm used to in .net. Thanks!

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• What are the use cases for closures/callback functions in Javascript?

  - by Christopher Altman

  I was listening to Crockford's talk on Javascript closures and am convinced of the benefit of information hiding, but I do not have a firm understanding of when to use callback functions. It is mostly a true statement that a person could accomplish the same functionality with or without callbacks. As someone who is writing code, what heuristics or cues should I keep in mind when determining when to use callbacks/closures? I am not looking for the blanket statement 'Closures make more secure code', rather a list of practical examples or rules of thumb for when callbacks are the right idea. Crockford's Presentation: http://www.yuiblog.com/blog/2010/04/08/video-crockonjs-5/

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• Diophantine Equation

  - by lakshmi

  Show that it is possible to buy exactly 50, 51, 52, 53, 54, and 55 McNuggets, by finding solutions to the Diophantine equation. You can solve this in your head, using paper and pencil, or writing a program. However you chose to solve this problem, list the combinations of 6, 9 and 20 packs of McNuggets you need to buy in order to get each of the exact amounts. Given that it is possible to buy sets of 50, 51, 52, 53, 54 or 55 McNuggets by combinations of 6, 9 and 20 packs, show that it is possible to buy 56, 57,..., 65 McNuggets. In other words, show how, given solutions for 50-55, one can derive solutions for 56-65.python

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• Is it possible to create a quine in every turing-complete language?

  - by sub

  I just wanted to know if it is 100% possible, if my language is turing-complete, to write a program in it that prints itself out (of course not using a file reading function) So if the language just has the really necessary things in order to make it turing complete (I would prove that by translating Brainf*ck code to it), like output, variables, conditions and gotos (hell yes, gotos), can I try writing a quine in it? I'm also asking this because I'm not sure that a quine directly fits into Turing's law that the turing machine is capable of any computational task. I just want to know so I don't try for years without knowing that it may be impossible.

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