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• General rule - when to use a model (Codeigniter)

  - by pingu

  Hi guys, I was just curious as to what the rule of thumb was for models. Generally, I use them only for situations where I need to add/edit or update database entries for an object. However, I'm building an app at the moment that has a "config" table which holds various data, such as last updated, which will control when certain features in the app should be displayed. In this instance, I will mostly need to retrieve data from the config table. Is it worth putting these config methods in model? I'm interested to hear how more experienced coders approach the MVC methodology in CI - example pseudo methods (e.g., what methods relating to the same object you'd use in the model and the controller) would be most helpful.

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• Deleting entity with child relationships using .Net Entity Framework problem

  - by Am

  My God, EF is so frustrating. I can't seem to be able to get my head around what I need to do so I can delete an object. I seem to be able to remove the object but not the related child objects. Can anyone tell me what is the rule of thumb when you want to delete all related child objects of a given object? I've tried loading all related objects like this: if (!object.childobjects.IsLoaded) object.childobjects.Load(); but once I do the following I get errors related to the relationships: modelcontext.DeleteObject(object); modelcontext.SaveChanges(); Why can't I just load the object using modelcontext.GetObjectByKey and remove it along with its child objects? My other question is can I delete an object using Entity command like so? DELETE e from objectset as e where e.id = 12 I've tried few variations and all of them throw exceptions.

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• Android ndk build mysteriously failing under cygwin with "Error 126"

  - by Jan Hudec

  I have a JNI application built by ndk-build (using Android NDK r5b and cygwin make 3.81). The build usually works, by occasionally fails with: ... Compile++ thumb : components <= Component.cpp make: *** [/c/.hudson/jobs/Nightly/workspace/application/obj/local/armeabi/objs/components/Component.o] Error 126 make: Leaving directory `/c/.hudson/jobs/Nightly/workspace/application/obj/local/armeabi/objs/components' There is no other error. Make than exits with status 2. It happens in different file each time (the name above is anonymized). It seems to happen more often with parallel builds, but sometimes happens with non-parallel builds too. Does anybody have an idea what it might be or at least how to debug it?

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• Image manipulation with JQuery and PHP

  - by robertdd

  I want to do some kind of image editor, after I upload more images I want to make a list with all the thumbnails! After, I want to be able to click on one thumb and rotate, duplicate, drag and drop (to change positions of the images), and delete the image. I want all the images to be in a php array. If an image is deleted I want to delete the row from array too. If a image is drag-and-dropped I want to change the position in the array too. Ok, after the user uploads all the images and modifies some of them, how can I make a DONE button to save the positions of the images? For this small project how do you suggest I save the images? (to make a table in mysql and store the names of the images in the database depending on the session id? depending on the IP?) Any suggestions are welcome!

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• Rmagick Fails To Manipulate PNG

  - by Tyler DeWitt

  Following the Railscast episode on CarrierWave: I installed ImageMagick on Mountain Lion via homebrew, exported the following path: export PKG_CONFIG_PATH="/opt/local/lib/pkgconfig:$PKG_CONFIG_PATH" Symlinked the following: ln -s /usr/local/include/ImageMagick/wand /usr/local/include/wand ln -s /usr/local/include/ImageMagick/magick /usr/local/include/magick And installed rmagick via bundler. In my uploader I have the following: include CarrierWave::RMagick version :thumb do process :resize_to_limit => [85, 85] end Which creates thumbnails just fine, but not for png files. I've tried a handful of png images and it always fails with this error: Failed to manipulate with rmagick, maybe it is not an image? Original Error: no decode delegate for this image format `<path>/public/uploads/tmp/20121022-2133-9885-3333/thumb_cat_vs_internet.png' @ error/constitute.c/ReadImage/544 jpeg images work just fine. EDIT identify -list format | grep -i png returns nothing, indicating the png decode delegate is probably missing. Now what?

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• arm-linux-androideabi-gcc: Internal error: Killed (program cc1) from Android NDK r8

  - by user577272

  When I build hello-jni which i got from the sample folder of android-ndk-r5, I got a folloiwng error. Would you please tell me your any idea what i missed? "arm-linux-androideabi-gcc: Internal error: Killed (program cc1)" Development environment: OS: Ubuntu 10.04 Desktop on WINDOWS 7 via VertualBox Android SDK: r08 Android NDK: r5 detail of error: $ ndk-build Gdbserver : [arm-linux-androideabi-4.4.3] libs/armeabi/gdbserver Gdbsetup : libs/armeabi/gdb.setup Compile thumb : hello-jni <= hello-jni.c arm-linux-androideabi-gcc: Internal error: Killed (program cc1) Please submit a full bug report. See http://gcc.gnu.org/bugs.html for instructions. make: * [/home/users001/android-ndk/samples/hello-jni/obj/local/armeabi/objs-debug/hello-jni/hello-jni.o] error1 Please advice.

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• Personal project/idea database and tracking

  - by cbrulak

  How do you keep track of your personal projects and ideas? If you come up with this amazing idea how do you write it down? Notepad? Some text file somewhere? How do you track your progress,etc? I'm not talking about FogBugz,etc as they are for tracking team work, I'm talking about tracking my ideas and projects and any associated content (notes,screenshots,etc) Can you put your solution on a thumb drive? Any suggestions for other developers?

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• VB6: Question about version numbers of dependent OCXs

  - by Craig Johnston

  Is it important for a VB6 app to refer to certain OCX versions? I have noticed that if I put my VB6 app code through the IDE on one machine then the form files will refer to different version of some OCXs than if I use another machine. What is the rule of thumb with this? Is it safe to assume that most of these old OCX versions will be compatible with each other and so I shouldn't worry? Some of the OCXs in question are: RICHTX32.OCX v1.1 and v1.2 COMCTL32.OCX v1.2 and v1.3

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• Rails - building an absolute url in a model's virtual attribute without url helper

  - by Nick

  I have a model that has paperclip attachments. The model might be used in multiple rails apps I need to return a full (non-relative) url to the attachment as part of a JSON API being consumed elsewhere. I'd like to abstract the paperclip aspect and have a simple virtual attribute like this: def thumbnail_url self.photo.url(:thumb) end This however only gives me the relative path. Since it's in the model I can't use the URL helper methods, right? What would be a good approach to prepending the application root url since I don't have helper support? I would like to avoid hardcoding something or adding code to the controller method that assembles my JSON. Thank you

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• UIActionSheet cancel button strange behaviour

  - by nevan

  I have a UIBarButtonItem opening an action sheet to offer users choices about what to do. Everything works as expected unless I try to click on the "Cancel" button. The target of the button appears to have moved up from where it should be. I can only activate it by clicking somewhere in the middle of the "Cancel" and "Ok" buttons. I've tried at action sheets in other applications and they work fine, so it's not just my big thumb. The action sheet is opening in a UIViewController - (void)showOpenOptions { UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:NSLocalizedString(@"Open link in external application?", @"Open in external application") delegate:self cancelButtonTitle:NSLocalizedString(@"Cancel", @"Cancel") destructiveButtonTitle:NSLocalizedString(@"Open Link", @"Open Link") otherButtonTitles:nil]; [sheet showInView:self.view]; [sheet release]; }

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• When to choose "Generate an activator..." when creating a new Eclipse plugin project

  - by Anon Support 2010

  There are lots of Eclipse RCP tutorials that begin with "Create a new plugin project..." It seems that approx. 70% of them specify checking the Generate an activator, a Java class that controls the plug-in life cycle. The others specifically say don't check that toggle. Its not clear to me, what generating an activator class does for you, when you need one, and when you don't. For being a prominent option you get every time you create a new plugin project (it seems to be set on by default) this option isn't very well explained anywhere that I have found. Any advice/rules of thumb on choosing this option when creating Eclipse plugin projects?

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• How do you make an image opened in colorbox scrollable

  - by nicholas.alipaz

  I would like my images that I open in colorbox to be displayed fullsize with no resizing applied to them and then apply scrollbars to allow for viewing the larger images. Some of my images are quite tall and things get pixelated when resized down. Currently colorbox just resizes my images down to the size of the available height/width. Is there a way to make all images display fullsize with overflow scrollable in colorbox? I am linking directly to an image: <a href="/myimage.png" title="My Image" class="colorbox imagefield imagefield-imagelink imagefield-field_portfolio_screenshot initColorbox-processed cboxElement" rel="gallery-12"> <img src="/thumb/myimage.png" alt="image" title="My Image" class="imagecache imagecache-portfolio_screenshot_thumb" height="50" width="50"> </a>

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• Customizing UISlider look

  - by tcurdt

  To customize the visual look of a UISlider you can set the thumb and track images. Part of the track images gets stretched to the appropriate with. From the documentation: A stretchable region sits between two end cap regions. The end caps define the portions of the image that remain as is and are not stretched. The stretchable region is a 1-point wide area between the end caps that can be replicated to make the image appear longer. Now the problem I have is that my stretchable region needs to be more than 1-point wide. (It's a pattern) Unfortunately the 1-point width seems to be hard coded in the SDK. Anyone having an idea how to work around this? Or will I have to write my own slider from scratch for this?

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• azure performance

  - by Dave K

  I've moved my app from a dedicated server to azure (and sql azure), and have noticed substantial performance degradation. obviously not having the database and web server on the same piece of hardware is much of it, but I'm curious what other people have found in migrating to azure, and if there is anything any of you would suggest I do to improve it. Right now I'm considering moving back to my dedicated server... So in summary, are there any rules of thumb for this, existing research (wasn't able to find much) or other pieces of advice on improving the performance of the app? has anyone else found the same to be true, and improved their site's performance in some way? it's built in C# on asp.net mvc 2. Thanks!

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• When to alter a function vs when to just write a new one...?

  - by Andrew Heath

  /is n00b Through the gift of knowledge and expertise encoded here, I am doing my best to avoid n00b mistakes as I learn the basics of programming. I use functions when I (think I) can in PHP, and keep them somewhat sorted in different includes. The n00b problem I'm running into now is situations where perhaps 4/5th of an existing function is relevant to a new need. Maybe there are a slightly different set of inputs, or an additional calculation or two in the series, or output needs a different format/structure... but the core of the function is still applicable. Is there a good rule of thumb regarding when one should bolt-on crap to an original function and when one should (literally) copy & paste most of it into a new function and tweak to fit the situation? On the one hand I feel bad duping code, on the other I feel bad cluttering up an existing function with stuff not always needed...

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• What is faster? Drawing or Compositing?

  - by mystify

  I make extensive use of -drawRect: to do some nice animations. A timer tries to fire 30 times per second with -setNeedsDisplay, but it feels like just 20 times. Also I can't use -setNeedsDisplayInRect: because the animation covers the entire thing. Would it help to take some of those drawing operations out of -drawRect: and move them to a subview? -drawRect has to do less then, but instead the OS will have more work with compositing views. Is there a rule of thumb which one is more worse? I remember from an apple text that they claimed Core Animation doesn't redraw during animation. So is that their secret of speed? Using subviews in animations?

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• Attachment_fu: can't disable :partition option

  - by Nathan Long

  I'm trying to use the Attachment_Fu plugin in a Rails project, and want to customize the paths where uploaded files are saved. The documentation shows this option: :partition # Whether to partiton files in directories like /0000/0001/image.jpg. Default is true. (The 0001 part is an ID from a table.) I don't want that, so I set the partition option to false, like so: class Photo < ActiveRecord::Base has_attachment :content_type => :image, :storage => :file_system, :max_size => 500.kilobytes, :resize_to => '320x200', :thumbnails => {:thumb => '100x100>' }, :partition => false validates_as_attachment end ...but the :partition => false option has no effect. Has anybody else encountered this problem? How did you fix it?

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• How Rails Controllers Should be Created? Should it be a verb, noun or an adjective?

  - by Winston

  I need some advice, what is the rule of the thumb when creating Rails controllers names? Should controller be all be verbs or a combination of nouns and verbs (or adjectives)? This is the example provided on creating controllers in Rails, ./script/generate controller CreditCard open debit credit close # which is a combination of nouns and verbs (unless credit and debit is made into a verb) However, if I create a scaffold, the default controller actions would be index, show, new, edit, update, destroy, which has 1 noun and all verb. Should nouns and verbs be separated completely for sake of consistency also providing a clearer project goals? Or should I mix them together?

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• Detect insertion of media into a drive using windows messages

  - by rschnorenberg

  I am currently using WM_DEVICECHANGE to be notified when new USB drives are connected to the computer. This works great for devices like thumb-drives where as soon as the device arrives it is ready to have files read from it. For devices like SD card readers it does not because the message is sent out once when the device is connected but no message is sent when a user actually inserts a card into the device. Is it possible to detect the insertion of new media into an existing USB device without having to use polling?

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• Why is there so much poorly indented code out there?

  - by dsimcha

  The more I browse the code to open source projects in languages that aren't Python, the more I realize that it seems a lot of programmers don't believe in proper indentation. (I won't mention any projects specifically to avoid having anyone take this question too personally.) Usually code is indented, but in a way just different enough from the standard style that it drives me crazy, especially in old/crufty code. I've noticed that when I write in C-like languages, I tend to indent correctly as religiously as when I'm writing in Python, with the exception of debugging code that I actually want to stick out like a sore thumb. Given how easy it is with a modern IDE to fix incorrect indentation, what are some rationales for not religiously keeping indentation in sync with braces?

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• What would be a good way to scale images in c#

  - by Younes

  I got a website which contains alot of projects with each project containing a sidebar. In this sidebar it is possible to attach images to a project. The images attached will be shown in a gallery with 3 small thumbs at the bottom and one bigger image at the top of the gallery. The big image will refresh to another image when a visitor clicks on the small thumb @ the bottom of the gallery. The thumbs are no problem, they are shown correctly. My problem is the bigger image at the top of the gallery. The images that get uploaded have a big variety of sizes, while my holder has a width of 239 and height of 179. What would be the best way to scale the images so that they are shwon correctly to the visitors of the website?

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• is it possible if callback in array_filter receive parameter ?

  - by justjoe

  i got this multiple array name $files[], who consist keys and values as below : [0] = Array ( [name] = index1.php [path] = http://localhost/php/gettingstarted/ [number] = 1 ) [1] = Array ( [name] = index10.php [path] = http://localhost/php/gettingstarted/ [number] = 2 ) [2] = Array ( [name] = index11.php [path] = http://localhost/php/gettingstarted/ [number] = 3 ) and i use this code to create new array consist of 'name' keys only. but it failed array_filter($files, "is_inarr_key('name')"); function is_inarr_key($array, $key) { //TODO : remove every array except those who got the same $key } and i got this error array_filter() [function.array-filter]: The second argument, 'is_inarr_key('name')', should be a valid callback in C:\xampp\htdocs\php\gettingstarted\index.php on line 15 so the queastion : 1. is it possible to make call-back function on array_filter has ability to receive parameter ? What is general rule of thumb on how to use callback in anyPHP built-in function ?

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• Writing shorter code/algorithms, is more efficient (performance)?

  - by Carlos

  After coming across the code golf trivia around the site it is obvious people try to find ways to write code and algorithms as short as the possibly can in terms of characters, lines and total size, even if that means writing something like: n=input() while n>1:n=(n/2,n*3+1)[n%2];print n So as a beginner I start to wonder whether size actually matters :D. It is obviously a very subjective question highly dependent on the actual code being used, but what is the rule of thumb in the real world. In the case that size wont matter, how come then we don't focus more on performance rather than size?

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• Rails diff model config in dev or prod environment

  - by Denis

  Hi, I've a model which use paperclip, in dev env I want to store files on the file system. In production I want to store them on my s3 account. How to configure my model to reflet this difference? Here is my model class Photo < ActiveRecord::Base has_attached_file :photo, :styles => { :medium => "200x200>", :thumb => "100x100>" }, :storage => :s3, :s3_credentials => "#{Rails.root}/config/s3.yml", :path => "/:style/:filename" end

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• Paperclip + ImageMagick on Windows 7: Image display fails when I add styles to attached_file in mode

  - by Brian Roisentul

  I'm working with Ruby on rails 2.3.8, NetBeans IDE. I've installed paperclip and I could show/save images successfully. Now, I've installed ImageMagick-6.6.2-4-Q16(for windows 7, 64bits). Until that moment, my model looked like this(and worked fine): has_attached_file :photo Now, after installing ImageMagick, when I add the :style line it fails: has_attached_file :photo, :styles => {:thumb => "100x100#", :small => "150x150>", :large => "400x400>" } and it throws the following error message when I try to upload an image: TypeError in ProfilesController#update backtrace must be Array of String The only thing I'm doing in the update action of that controller is the following: @profile.update_attributes(params[:profile]) @profile.update_attribute(:photo, params[:profile][:photo]) I've also installed miniMagick gem(because I read somewhere I had to do it). What am I missing?

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