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• How to allow sorting in the Django admin by a custom list_display field, which doesn't have a DB fie

  - by Gj

  I have a custom list_display field which is responsible for a column of integers in one of my admin pages. I need to allow staff members to sort according to it. There's a solution for how to acheive that if the integer represents a count/average/etc of some DB field, which is not the case for me. [ the solution for that case is here: http://stackoverflow.com/questions/2168475/django-admin-how-to-sort-by-one-of-the-custom-list-display-fields-that-has-no-da ] Any ideas how I can achieve this sorting without actually creating and maintaining a DB field for the values?

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• Python Library installation

  - by MacPython

  Hi everybody I have two questions regarding python libraries: I would like to know if there is something like a "super" python library which lets me install ALL or at least all scientific useful python libraries, which I can install once and then I have all I need. There is a number of annoying problems when installing different libraries (pythonpath, cant import because it is not installed BUT it is installed). Is there any good documentation about common installation errors and how to avoid them. If there is no total solution I would be interested in numpy, scipy, matplotlib, PIL Thanks a lot for the attention and help Best Z

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• How to handle customers with multiple addresses in CakePHP

  - by Ryan

  I'm putting together a system to track customer orders. Each order will have three addresses; a Main contact address, a billing address and a shipping address. I do not want to have columns in my orders table for the three addresses, I'd like to reference them from a separate table and have some way to enumerate the entry so I can determine if the addressing is main, shipping or billing. Does it make sense to create a column in the address table for AddressType and enumerate that or create another table - AddressTypes - that defines the address enumeration and link to that table? I have found other questions that touch on this topic and that is where I've taken my model. The problem I'm having is taking that into the cakePHP convention. I've been struggling to internalize the direction OneToMany relationships are formed - the way the documentation states feels backwards to me. Any help would be appreciated, Thanks!

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• Validating an Autocomplete field in Django

  - by anonymous coward

  I have models similar to the following: class Band(models.Model): name = models.CharField(unique=True) class Event(models.Model): name = models.CharField(max_length=50, unique=True) bands = models.ManyToManyField(Band) and essentially I want to use the validation capability offered by a ModelForm that already exists for Event, but I do not want to show the default Multi-Select list (for 'bands') on the page, because the potential length of the related models is extremely long. I have the following form defined: class AddEventForm(ModelForm): class Meta: model = Event fields = ('name', ) Which does what is expected for the Model, but of course, validation could care less about the 'bands' field. I've got it working enough to add bands correctly, but there's no correct validation, and it will simply drop bad band IDs. What should I do so that I can ensure that at least one (correct) band ID has been sent along with my form? For how I'm sending the band-IDs with auto-complete, see this related question: http://stackoverflow.com/questions/1528059/

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• Where do I change the height of a navigationBar for an iPhone app?

  - by Tony

  In my applicationDidFinishLaunching I set up a UINavigationController: - (void)applicationDidFinishLaunching:(UIApplication *)application { navController = [[UINavigationController alloc] init]; [[navController navigationBar] setFrame:CGRectMake(0.0,0.0,320.0,20.0)]; ... } As you can see, I am trying to make the navigation controller's height 20px. However, this is not working. I would imagine setFrame must be the correct function but I am not calling it in the right place. I realize that other questions on SO are similar to mine, but I think setting the navigationBar height should be possible if it responds to setFrame...right? Also, anyone know the default height of the navigationBar? Thanks!

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• jQuery Optimizations

  - by aepheus

  I've just come to the end of a large development project. We were on a tight timeline, so a lot of optimization was "deferred". Now that we met our deadline, we're going back and trying to optimize things. My questions is this: What are some of the most important things you look for when optimizing jQuery web sites. Alternately I'd love to hear of sites/lists that have particularly good advise for optimizing jQuery. I've already read a few articles, http://www.tvidesign.co.uk/blog/improve-your-jquery-25-excellent-tips.aspx was an especially good read.

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• Ownership regarding to returned Quartz objects

  - by huggie

  I have recently asked about autoreleasing a returned quartz object: http://stackoverflow.com/questions/2819548/autorelease-for-cgmutablepathref Dave DeLong answered my question that there is no autorelease for quartz (or any NS foundation objects) and I should use the Create Rule. However the naming convention on the document says, The Core Foundation naming conventions, in particular use of the word “create”, only apply to C functions that return Core Foundation objects. Naming conventions for Objective-C methods are governed by the Cocoa conventions, irrespective of whether the method returns a Core Foundation or Cocoa object. By this account since my function is a message in an objective C object it doesn't seem proper to name it createSomething. I still want to return this object. What's the best way to approach this? Should I use the Get Rule and then have the caller explicitly retain it? But this is not within Cocoa convention. What's the proper way to handle this?

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• How does py2exe actually -and simply explained- work? :)

  - by sandra

  Hi folks, I have a c++ app that calls another python one (bundled into an exe with py2exe) So I have 2 apps. So I was wondering: What if my c++ did what py2exe does? i.e. embed the python app in the c++ one. This way I won't depend on py2exe and its configurations nighmares (yes, it has some) Hence my questions: how does py2exe work (so I can do its job with my c++ app) What about just embedding the whole python app with the c++? I read the python doc about embedding, did an example (a very simple one that does PyRun_SimpleString) but what about a whole python app with tons of modules? (zipimport maybe?) I'd love to hear how you'd do that. Thanks a lot! :)

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• Get a list of Android phone contacts only on Eclair and above?

  - by Rob Kent

  I want to show the user a flattened pick list of all their contacts phone numbers and it must work from versions 1.6 up. I have read the related questions on SO and the Android documentation for Eclair (http://developer.android.com/resources/articles/contacts.html#legacy). The problem is, even splitting my code into a factory class and specific implementations does not work for me because using Contacts.CONTENT_URI only shows contacts not individual numbers. What I need is this for version 1.6 Intent intent = new Intent(Intent.ACTION_PICK, Phones.CONTENT_URI); startActivityForResult(intent, REQUEST_PICK_CONTACT); And the equivalent for 2.0 and above. Even if I get their example to work, by building against the 2.1 API am I not stopping my app being visible on the Market to users with earlier versions of the OS? I can't launch it against a 1.6 emulator, for example.

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• Why do I get HTTP Code 414 on one network but not another?

  - by Stephen Darlington

  I have an otherwise working iPhone program. A recent change means that it generates some very long URLs (over 4000 characters sometimes) which I know isn't a great idea and I know how to fix -- that's not what I'm asking here. The curious thing is that when I make the connection using a 3G network (Vodafone UK) I get this HTTP "414 Request-URI Too Long" error but when I connect using my local WiFi connection it works just fine. Why would I get different results using different types of network? Could they be routing requests to different servers depending on where the connection originates? Or is there something else at stake here? The corollary questions relate to how common this is. Is it likely to happen whenever I use a cell network or just some networks?

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• Can I animate a radial gradient in iPhone?

  - by user364782

  I would like to animate a radial gradient to shrink and grow the inner radius, as if it were pulsing. Right now I'm rendering the gradient with CGGradient, but I'm not sure how to animate it. I've seen this topic http://stackoverflow.com/questions/1819311/can-you-animate-gradients-using-quartz-in-an-iphone Which explains how animate a linear gradient with CAGradientLayer, but it doesn't seem like this will draw a radial gradient. Is there an easy way to animate a CGGradient, or some way to create a radial gradient CAGradientLayer? Any thoughts are appreciated.

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• Learning OpenGL ES 1.x

  - by Kristopher Johnson

  What is the quickest way to come up to speed on OpenGL ES 1.x? Let's assume I know nothing about OpenGL (which is not entirely true, but it's been a while since I last used OpenGL). I am most interested in learning this for iPhone-related development, but I'm interested in learning how it works on other platforms as well. I've found the book OpenGL ES 2.0 Programming Guide, but I am concerned that it might not be the best approach because it focuses on 2.0 rather than 1.x. My understanding is that 2.0 is not backwards-compatible with 1.x, so I may miss out on some important concepts. Note: For answers about learning general OpenGL, see http://stackoverflow.com/questions/62540/learning-opengl Some resources I've found: http://khronos.org/opengles/1_X/ http://www.imgtec.com/powervr/insider/sdk/KhronosOpenGLES1xMBX.asp OpenGL Distilled by Paul Martz (a good refresher on OpenGL basics)

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• Ruby mailer is coming up with an EOFError

  - by Deadder

  I am getting an EOFError (End Of File Error) on this code in my controller. The block where the error appears is at the end of the line that says UserMailer.deliver_message( I am unaware as to how to fix this, I have been stuck for about 2 months and this site was suggested. Please help. def contact @title= "Contact Us" if request.post? @message= Message.new(params[:contact]) if @message.valid? UserMailer.deliver_message( :message => @message ) flash[:notice] = "Thank you for contacting us" redirect_to contact_url end end end Here is the message file: <%= @mail.name %> has sent feedback or a question: Message: <%= @mail.body %> From: <%= @mail.email %> And here is the UserMailer class UserMailer < ActionMailer::Base def message(mail) subject 'Feedback/Questions' recipients 'Email@email' from 'webmaster' body mail end end

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• Fetch Max from a date column grouped by a particular field

  - by vamyip

  Hi, I have a table similar to this: LogId RefId Entered ================================== 1 1 2010-12-01 2 1 2010-12-04 3 2 2010-12-01 4 2 2010-12-06 5 3 2010-12-01 6 1 2010-12-10 7 3 2010-12-05 8 4 2010-12-01 Here, LogId is unique; For each RefId, there are multiple entries with timestamp. What I want to extract is LogId for each latest RefId. I tried solutions from this link:http://stackoverflow.com/questions/121387/sql-fetch-the-row-which-has-the-max-value-for-a-column. But, it returns multiple rows with same RefId. Can someone help me with this? Thanks Vamyip

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• Have you switched from CodeIgniter to Kohana?

  - by Eli

  Hi All, I usually just work with straight PHP, but want to try MVC and see if a framework will really speed up development. After much waffling, analysis paralysis, and many dumb SO questions, I thought I had settled on CodeIgniter for my next PHP project. However, I am now seriously considering Kohana. Has anyone made the switch from CI to Kohana? If so, why? What's better about the actual code, libraries, etc? Edit: Hi All, I did end up going with Kohana. It's easy to use, but more importantly, it's easy NOT to use, since there are a lot of things I like to work with native PHP for. It's ridiculously extensible, well coded, and seems like it is beginning to pull out ahead of CI in a few things like putting views in views, passing subview data, etc. I am sure CI will catch up, but Kohana should be 3 steps ahead by then =o)

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• What's your favorite programmable calculator?

  - by Pat Notz

  The HP-32S still holds a soft spot in my heart, even though it only had 4 registers. I have fond memories of writing a nonlinear solver for finding an azeotrope curve during a Thermodynamics final. Despite the increase in power, memory, pixels and features the HP-32G that followed never could steal my heart away. Here's to you, HP-32S. Let's hear it, what's your favorite programmable calculator? As with all poll type questions, do NOT submit a new answer unless your answer is not represented. Vote up your answer instead of adding yet another TI-85 or HP-49 to the list, and add comments to that answer if you want to relate specifics. EDIT: I moved my photo into an answer for polling.

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• Remove unnecessary svn:mergeinfo properties

  - by LeonZandman

  When I merge stuff in my repository Subversion wants to add/change a lot of svn:mergeinfo properties to files that are totally unrelated to the things that I want to merge. Questions about this behaviour have been asked before here on Stackoverflow.com, as you can read here and here. From what I understand from the topics mentioned above it looks like a lot of files in my repository have explicit svn:mergeinfo properties on them, when they shouldn't. The advice is to reduce the amount and only put those properties on relevant files/folders. So now my question: how can I easily remove those unneeded properties? I'm using TortoiseSVN, but am reluctant to manually check/fix hundreds of files. Is there an easier way to remove those unnecessary svn:mergeinfo properties? P.S. I'm not looking for C++ SVN API code.

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• iPython in Emacs. Quick code evaluation

  - by AmV

  Hi all, I would like to "send" code snippets to a iPython interpreter in Emacs 23.2 (Linux). I have two related questions about this: Q1: I have learned that Emacs provides ('shell-command-on-region') to run selected regions in a shell. I have set setq shell-file-name to my iPython path, but when I run M-| after selecting a region, Emacs prompts me the following: Shell command on region: and if I then type RET, I get the iPython man page on the *Shell Command Output* buffer, without the region being executed. Why? Q2: Assuming that I have already started an iPython shell in some other buffer in Emacs, is there a way of selecting a region in another buffer and "sending" this region to the already-started iPython shell? Thanks!

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• Making a relevant search of text in database using regex

  - by madphp

  Can anyone tell me how I could count the possible instances of a keyword in a block of text? I've split a search term up into separate tokens, so just need to run through and do a count for every instance and removing punctuation or other special characters when making the count. Secondly, if someone has inserted search terms surrounded by double quotes, i want to be able to skip explode, but just count instances of that exact phrase. It doesn't have to be case sensitive and I would like to remove punctuation from the phrase when doing the count. Thirdly, in both cases i want to be able to ignore wordpress and html tags. Lastly, if anyone know any good tutorials for relevant searches that answer the questions above, that would cool too. I've got this far. $results = $wpdb->get_results($sql); $tokens = explode('search_terms'); // Re-arrange Relevant Results foreach ($results As $forum_topic){ foreach($tokens As $token){ // count tokens in topic_title if ($token ){ } } }

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• Are today's young programmers getting wrapped around the axle with patterns and practices?

  - by Robert Harvey

  Recently I have noticed a number of questions on SO that look something like this: I am writing a small program to keep a list of the songs that I keep on my ipod. I'm thinking about writing it as a 3-tier MVC Ruby on Rails web application with TDD, DDD and IOC, using a factory pattern to create the classes and a singleton to store my application settings. Do you think I'm taking the right approach? Do you think that we're handing novice programmers a very sharp knife and telling them, "Don't cut yourself with this"? NOTE: Despite the humorous tone, this is a serious (and programming-related) question.

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• Android Shopping App And SQLite

  - by Melih Mucuk

  I want to develop shopping app for android and it should works like tinypay.me Users can sign up and they sell items or buy items immediately. I need to database. I want to use SQLite but I don't find any answer to these questions: SQLite database files are stored on the user's phone, isn't it ? If it's true, here is the scenario: User logged in, then he/she wants to sells something on app. He/she creates ad and he/she published it on the app. These variables writing their database. When other users logged in, will they see this ad? If it's possible, how can sync database between users ? Thanks for attention.

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• Is there anyone out there that codes like me?

  - by Jacob Relkin

  Hi, Some people have told me that my coding style is a lot different than theirs. I think I am somewhat neurotic when it comes to spacing and indenting though. Here's a snippet to show you what I mean: - ( void ) applicationDidFinishLaunching: ( UIApplication *) application { SomeObject *object = [ [ SomeObject alloc ] init ]; int x = 100 / 5; object.someInstanceVariable = ( ( 4 * x ) + rand() ); [ object someMethod ]; } Notice how I space out all of my brackets/parentheses, start curly braces on the same line, "my code has room to breathe", so to speak. So my questions are a) is this normal and b) What's your coding style?

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• Microsoft expressions ... How its different from visual studio ?

  - by Xinus

  I heard just Microsoft Expressions studio from my project manager and he told me to explore on it and find out if we can do development faster using it as compared to vs2008, I started downloading trial version and started googling about it, but I couldn't find answers to following questions Why Microsoft came out with new IDE when they already have very successful one i.e. the visual studio ? How its different that visual studio ? Does it offer advantages over visual studio ? Can somebody please help me find out these answers ?

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• Access 2007 - Forms created on the fly

  - by glinch

  Hi There, Hopefully I can find some words of advice from somebody. Is it possible to create forms 'on-the fly' so to speak in MS-Access 2007 I have a structure of tables: tblCustomer tblQuestAns A customer may answer the questionnaire answers many times as they relate to all products. I propose to hopefully have an initial input form that will ask how many products of which there could be more than 1 eg: TV, Video (say the user selects 2) On entering that data the next form should hopefully update itself to include the list of questions eg TV Q1, Q2 Q3 - Video (1) Q1, Q2 Q3 - Video (2) Q1, Q2 Q3 Is that possible? Any point in the right direction would be appreciated. Thanks Noel

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• How can I write cocoa bindings as code instead of in the Interface Builder?

  - by johnjohndoe

  In my modell got an NSMutableArray that keeps track of a changing number of elements. In my view I got a NSTextField that shows the number of elements. The view gots unarchived from the nib file and alloc/inits the modell. Therefore it knowns about the modell and the contained array. I established the connection as follows. In the Interface Builder at the textfield I added a Cocoa Binding "path" like this: myModell.myArray.@count. By this I can access the count property (which is a must since the array itself does not change). The binding is based on key-value compliance which I established at the modell so the array can be accessed. But key-value compliance is not part of the questions. My question: How can I put the binding into the sourcecode and not writing it into the Interface Builder?

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