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• Reference book on Ruby on Rails social network site for novices

  - by Christopher

  Hey, so I am a novice programmer who has only worked with HTML, CSS, and a touch of Java a couple of years ago. I am looking to try to get a social network site up and running on Ruby on Rails and was looking at RailsSpace: Building a Social Networking Website with Ruby on Rails (Addison-Wesley Professional Ruby Series) - Paperback (July 30, 2007) by Michael Hartl. This was published in 2007, however, and the newer reviews say it is not very helpful. Does anyone know if there are any new publications out there that walk you through building a social network site while teaching you the code(rather than just using a out of the box program)? Thanks

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• Updating rows using "in" operator in "where" clause

  - by doublep

  Hi. I stumbled upon SQL behavior I don't understand. I needed to update several rows in a table at once; started with just finding them: SELECT * FROM some_table WHERE field1 IN (SELECT ...) This returned a selection of about 60 rows. Now I was pretty confident I got the subquery right, so I modified the first part only: UPDATE some_table SET field2 = some_value WHERE field1 IN (SELECT ...) In other words, this was exactly as the first query after the WHERE. However, it resulted in 0 rows updated, whereas I would expect those 60. Note that the statement above would change field2, i.e. I verified that some_value was not present in the selected rows. The subquery was a modestly complicated SQL piece with 2 (different) tables, 1 view, joins and its own WHERE clause. In case this matters, it happened with Oracle Database 10g. So, the question is, why UPDATE didn't touch the rows returned by SELECT?

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• How to launch a mac application without a terminal window.

  - by KPexEA

  I've written an open-source c++ application and it works fine on Windows and Linux, I finally got a Mac Mini (with 10.5.8) so I've just been testing the Mac version. My application works fine when running it from inside a terminal window and typing ./appname , but if instead I double click on it from the finder, then it opens a termnial window first and then runs my app but it doesn't seem to set the working directory to the correct location so my app dies. How do I make my app so when it launches by being double clicked on it doesn't open a terminal window first and how can I have the current directory set to the apps location automatically?

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• How to correctly load 32-bit DLL dependencies when running a program from a batch file

  - by neilwhitaker1

  I have written a tool that references Microsoft.TeamFoundation.VersionControl.Client.dll, which is a 32-bit DLL. When I build my tool on 64-bit Windows, I set Visual Studio to specifically target X86 in order to force it to a 32-bit build. Targetting X86 instead of All-CPU's prevents me from getting a BadImageFormatException, as long as I invoke the tool directly (e.g. by typing "myTool.exe" on the command line). However, if I run a batch file that invokes the tool, I still get the exception. This happens even if the batch file runs in a 32-bit command prompt (%WINDIR%\SysWOW64\cmd.exe). What else can I do to make this work?

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• Is there a convention for organizing the include/exports in a large C++ project ?

  - by BlueTrin

  Hello, In a large C++ solution, is there a best/standard way to separate the include files necessary to build an intermediary DLL and the include files which will be used by the DLL clients ? We have grouped all the include files in a folder called Interface (for DLL interface), but there the customers have to either include the Interface folder as a default include folder or type the full name as: #include "ProjectName/Interface/myinterface.h" Wouldn't it be better to create a separate folder called exports where I would create a folder called ProjectName and put the include files there ? So that the customers would be typing: #include "ProjectName/myinterface.h" If I do the thing right above, then should I keep the files within the solution and produce a post build event (I use Visual Studio 2k5) to copy the files into the "export" folder (/ProjectName/) ? Or is it better to just include directly the files from this folder within my project (this is more direct and has less chances to cause maintenance issues ? I am more looking for advice than for a definite solution. Thank you for reading this ! Anthony

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• Installing app on Devices(iPhone/iPod)

  - by Shakti

  Hi, I have developed an application for iPhone and iPod touch. Now i want to install that app on the device. I have created a provisioning profile for the particular device. My query is that, now to install the app on a device I have to add the provisioning profile of that device to xcode and after selecting the developer in build option in project info pane i build the project and send the build and provisioning profile to the user. Is there any to install the app without doing the above task of building the project with the provisioning profile. Means i have a build of an app and a newly downloaded provisioning profile. I will send the user both build and profile in a zip file. will the user be able to install the app on his/her device?

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• How to push text from one UITextfield to another UITextfield in the next View? And back!?

  - by Chrizzz

  an Hi, I have an UITextField in one view, UITextField A in View A. And I have another in view B, UITextField B in View B. I use a Navigation Controller Bar to switch between the views. The UITextFields are properties and connected Outlets of both views A and B. On my view A there is an "Options"-button which pushes view B. So when you are typing in Textfield A, I would like the same text to appear in Textfield B. When you edit TextField B and you go back to view A (via the "Title View A"-button in de navigation bar), I would like the same text to re-appear in Textfield A. I expected this to be easy. But I can't get it working. I tried: ViewBController *controller = [[ViewBController alloc] initWithNibName:@"ViewBController" bundle:nil]; controller.TextFieldA.text = TextFieldB.text But nothing appeared in view B. And how do I get back? I dont want to use NSUserdefaults because I would have to remove the values also.

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• Optimising (My)SQL Query

  - by Simon

  I usually use ORM instead of SQL and I am slightly out of touch on the different JOINs... SELECT `order_invoice`.*, `client`.*, `order_product`.*, SUM(product.cost) as net FROM `order_invoice` LEFT JOIN `client` ON order_invoice.client_id = client.client_id LEFT JOIN `order_product` ON order_invoice.invoice_id = order_product.invoice_id LEFT JOIN `product` ON order_product.product_id = product.product_id WHERE (order_invoice.date_created >= '2009-01-01') AND (order_invoice.date_created <= '2009-02-01') GROUP BY `order_invoice`.`invoice_id` The tables/ columns are logically names... it's an shop type application... the query works... it's just very very slow... I use the Zend Framework and would usually use Zend_Db_Table_Row::find(Parent|Dependent)Row(set)('TableClass') but I have to make lots of joins and I thought it'll improve performance by doing it all in one query instead of hundreds... Can I improve the above query by using more appropriate JOINs or a different implementation? Many thanks.

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• How can I write a null ASCII character (nul) to a file with a Windows batch script?

  - by Matthew Murdoch

  I'm attempting to write an ASCII null character (nul) to a file from a Windows batch script without success. I initially tried using echo like this: echo <Alt+2+5+6> which seems like it should work (typing <Alt+2+5+6> in the command window does write a null character - or ^@ as it appears), but echo then outputs: More? and hangs until I press <Return>. As an alternative I tried using: copy con tmp.txt >nul <Alt+2+5+6><Ctrl+Z> which does exactly what I need, but only if I type it manually in the command window. If I run it from a batch file it hangs until I press <Ctrl+Z> but even then the output file is created but remains empty. I really want the batch file to stand alone without requiring (for example) a separate file containing a null character which can be copied when needed.

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• How to get a Javascript routine to NOT act if it's in a text box?

  - by talkingnews

  I've got a simple page, and in that page runs a simple jquery keypress routine to catch clicks of the numbers 1 to 9 (has to be that to pass RNIB accessibility test). And in that page is a form, which can have numbers entered as part of a postcode. http://find.talking-newspapers.co.uk/result.php?addressInput=kingston Scroll to the bottom, try typing 8 or 9 for example. The text is entered, but it also acts on the keypress. Expected, but not good. I'm aware of various things like document.getElementById, but I can't figure out how to put these together to ensure that while the cursor is in the text input box, it doesn't act out the keypress catcher.

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• .NET TreeView causes application to crash when trying to check Parent node

  - by alexD

  I have a TreeView with check boxes, and when a user checks a child node, I want to go up the tree and check each parent. However, for some reason my application blows up whenever I touch the parent node. For the nodes in my tree, I've extended TreeNode to create my own objects with some data that I need to store in them, but I still reference them as TreeNodes when checking/unchecking. My code looks like this: //checkBox checked event handler if (node.Parent != null) { checkAllParents(node.Parent); } // private void checkAllParents(TreeNode node) { node.Checked = true; if (node.Parent != null) { checkAllParents(node.Parent); } }

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• How can I revert a 'draggable' upon failed AJAX request?

  - by Frank

  I have a draggable div, that needs to be dropped on a droppable. If it is dropped correctly, the droppable calls an AJAX request. If the draggable does not have a valid id or the AJAX request fails, the draggable should be reverted to it's original position. Is that something that can be done with jQuery?! Any help is greatly appreciated!! $("div.draggable").livequery(function(){ $(this).draggable({ revert: 'invalid', distance: 20 }) }); $("#trash").droppable({ tolerance: 'touch', drop: function(event, ui) { var item = ui.draggable; var id = item.attr('id'); if (id) { $.ajax( { type: "POST", url: "delete.php", data: "id=" + id, success: function(html) { if (html) { item.remove(); } else { // FAILED AFTER AJAX // is it possible to revert the draggable from here?? } } }); } else { // FAILED BEFORE AJAX // is it possible to revert the draggable from here?? } } });

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• AsyncTask Threading Rule - Can it really only be used once?

  - by stormin986

  In the documentation on AsyncTask it gives the following as a rule related to threading: The task can be executed only once (an exception will be thrown if a second execution is attempted.) All this means is that you have to create a new instance of the class every time you want to use it, right? In other words, it must be done like this: new DownloadFilesTask().execute(url1, url2, url3); new DownloadFilesTask().execute(url4, url5, url6); Or conversely, you can NOT do the following: DownloadFilesTask dfTask = new DownloadFilesTask(); dfTask().execute(url1, url2, url3); dfTask().execute(url4, url5, url6); Can someone verify this is an accurate interpretation? I realize I pretty much just answered this for myself as I was typing this out... But it wasn't immediately obvious to me so I think this would be useful to have posted nonetheless.

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• Is search and replace the only way to rename an asp control in the code behind file?

  - by Matt

  Is search and replace the only way to rename as asp control in the code behind file? I find this extremely annoying, but it is the only way I can find. Scenario: I'll find a variable that needs renaming (Usually to meet naming convention) I'll rename the variable in the aspx/ascx file. I'll have to go in the code behind files and search and replace. I get annoyed Are there any better ways - preferably that would not touch a similarly named variable in another scope in the project. I'm on VS2008 with resharper -- does VS2010 address this perhaps?

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• Get touches from UIScrollView

  - by Peter Lapisu

  Basically i want to subclass UIScrollView and hande the touches, however, the touch methods dont get called (i searched the web for a solution and i found out people pointing to override the hit test, what i did, but with no result :( ) .h @interface XScroller : UIScrollView @end .m - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event { UIView *result = nil; for (UIView *child in self.subviews) { if ([child pointInside:point withEvent:event]) { if ((result = [child hitTest:point withEvent:event]) != nil) { break; } } } return result; } - (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"BEGAN"); [super touchesBegan:touches withEvent:event]; } - (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"MOVED"); [super touchesMoved:touches withEvent:event]; } - (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"ENDED"); [super touchesEnded:touches withEvent:event]; } - (void) touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"CANCELED"); [super touchesCancelled:touches withEvent:event]; } none of the - (void) touches* methods get called, the scrolling works ok

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• Concerns with SoapUI Pro when Updating Web Services

  - by Plenoge

  This may unfortunately be a very open-ended question, but a coworker of mine has shared concerns about using SoapUI Pro as our automated regression testing tool primarily on the basis that seemingly trivial WSDL changes can cause headaches for the QA crew. My coworker's particularly concerned that if we update the WSDL, even with a name change, we'll need to touch and update each existing test. As I understand it SoapUI Pro offers a refactoring tool to handle this for you. What are your experiences with SoapUI Pro and updating your web services? Am I missing something?

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• how do I set a delegate in a view that is not my main view

  - by orangecl4now

  I have a xib. the xib has a button that swaps another xib. the second xib has a uitextfield and a uilabel. how do I make the keyboard go away when I'm done typing? what do I need to wire or code? the second xib has it's own class (called CustomSign.m) Inside CustomSign.m, I've implemented the following method -(void)textFieldDidEndEditing:(UITextField *)textField { [customText resignFirstResponder]; signedLabel.text = customText.text; } - (void)awakeFromNib { //assume textField is an ivar that is connected to the textfield in IB [customText setDelegate:self]; } I get the following warning Class "CustomSign" does not implement the UITextFieldDelegate protocol

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• Accented character replacement for search then reinserted afterwards

  - by user314573

  Basically my issue is that users would like to search for a french word that has accented characters but without typing in the accented characters and then have the actual accented word appeared highlighted if found... So for example they would type in "declare" but in the result sets it would look like "déclare" and if found "déclare" would be highlighted. My first thought was to just simply replace the characters with a regex but then I remembered that I would need to re-insert the replaced characters after the search... I was thinking of then using some sort of character map that would track position and the character so that when the search was finshed I could put the result set back to the way it was. This seems a little brute force to me and I was wondering if anyone had a better alternative? I'm using Visual Studio 2005 with this app. Any advice would be much appreciated! Thanks

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• Have a doubt on uritemplates in WCF Services

  - by Debby

  I have a webservice with following operation contract and my service is hosted at //localhost:9002/Service.svc/ (I did not put http: before the localhost, as new user can post only one hyperlink) [OperationContract] [WebGet ( UriTemplate = "/Files/{Filepath}" ) ] Stream DownloadFile(string Filepath); This webservice would let users download file, if the proper filepath is provided (assuming, i somehow findout proper filepath). Now, I can access this service from a browser by typing, //localhost:9002/Service.svc/Files/(Filepath} If {filepath} is some simple string, its not a problem, but i want to send the location of the file. Lets us say users want to download file "C:\Test.mp3" on the server. But how can I pass "C:\Test.mp3" as {Filepath}. I get an error when i type http://localhost:9002/Service.svc/Files/C:\Test.mp3 in the browser. I am new to webservices and find that quickest way to clear doubts is in this community.

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• UITableView - Color a selectede cell in table (remain colored)

  - by Liron Loop

  Hi In my app i'm using a UITableViewController ("grouped style") which in one of its section I want the user to be able to see what he had selected by making this cell colored and other "uncolored". Doing it by updating all cells' background color and reloading table data, each time user touches a cell (in didSelectRowAtIndexPath:) Problem is that there is some processing made in the didSelectRowAtIndexPath: so the color doesn't get changed right a way, rather in a bit delay after touch was made. (I gusse the processing is the resone for the tiny delay) Is there a better way of doing it? Any help will be appreciated Liron P.S. I'm new to all of this...

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• Showing/Hiding windows iPhone Dev

  - by Cal S

  In my iPhone app I am developing, I have defined two windows: @interface The_NoteAppDelegate : NSObject <UIApplicationDelegate> { IBOutlet UIWindow *newNoteWindow; IBOutlet UIWindow *homeWindow; } @property (nonatomic, retain) UIWindow *newNoteWindow; @property (nonatomic, retain) UIWindow *homeWindow; and they are linked correctly in IB - but how do I show/hide these windows? [homeWindow makeKeyAndVisible]; works in appDidFinishLaunching but when I try [newNoteWindow makeKeyAndVisible]; again to open the other window (on a button touch event) in front of the other, the app freezes. I know this is a very n00by question but please help me out :)

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• Which is the UI technology of the future considering: eye-candy-effect, interactivity (gestures, voc

  - by user193655

  If you had to write a next-gen application, in which on the surface (UI) you need some "futuristic features", by considering the following aspects which is the choice you'd make? 1) eye-candy: cool UI, 3D, Effects, nice graphics, sound transitions... 2) user interaction: not only mouse and keyboard but touch, voice and more.... + user interactivity aspect, which is the technology you'd choose? 3) X-platform: this is to have some X-platform discussion. Of course single platform technologies (as WPF) have may be some more power, anyway in a general discussion considering X-platform as a resource is important 4) available components: of course the coolest technology with no available components is may be an option for a component developer but not for an application developer My question is generic, but anyway * have in mind data-driven apps, not pure multimedia apps, videogames, ....

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• Session troubles when used on BT hosting

  - by YsoL8

  Hello I have developed a site for a client with a pre-existing BT hosting package. Since going live there has been a problem where $_session loses it's data between pages. I have previously fixed the problem, but somehow it has become unfixed. Last time this problem happened, my research indicated that there is something funny with BT's setup when using sessions, and that article provided this code: if(ini_get('register_globals') == 1) if(is_array($_SESSION)) foreach(array_keys($_SESSION) as $var_to_kill) unset($$var_to_kill); Which even though it looks broken to me, did in fact reduce the problem to a very low level. (i.e one drop out a day). However, today my client is in touch again and surprise surprise, the problem is back. Does anyone know of a solution? (My client has already stated they will not change hosts!) Oliver

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• Known problems with filemtime() on Windows - files getting touched arbitrarily?

  - by Pekka

  Is there a known issue leading to file modification times of cache files on Windows XP SP 3 getting arbitrarily updated, but without any actual change? Is there some service on a standard Windows XP - Backup, Sync, Versioning, Virus scanner - known to touch files? They all have a .txt extension. If there isn't, forget it. Then I'm getting something wrong in my cache routines, and I'll debug my way through. Background: I'm building a simple caching wrapper around a slow web site on a Windows server. I am comparing the filemtime() time stamp to some columns in the data base to determine whether a cached file is stale. I'm having problems using this method because the modification time of the cache files seems to get updated in between operations without me doing anything. THis results in stale files being displayed. I'm the only user on the machine. The operating system is Windows XP, the webserver a XAMPP Apache 2 with PHP 5.2

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• problem while switching between Portrait and landscape in android views

  - by vnshetty

  In my application im going to display a web page in web view , it works fine but if i flip between landscape to portrait or vice versa, then it exits and comes to main page. wht is the prblm? logcat: 03-10 13:35:47.123: INFO/WindowManager(69): Setting rotation to 1, animFlags=1 03-10 13:35:47.242: INFO/ActivityManager(69): Config changed: { scale=1.0 imsi=310/260 loc=en_US touch=3 keys=2/1/1 nav=3/1 orien=2 layout=17 uiMode=17 seq=70} 03-10 13:35:47.363: INFO/UsageStats(69): Unexpected resume of com.mireader while already resumed in com.mireader 03-10 13:35:50.413: DEBUG/dalvikvm(69): GC_EXPLICIT freed 395 objects / 20424 bytes in 195ms

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