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• Rails, ActiveRecord, how to find foreign rows that are NOT there?

  - by randombits

  The title is a bit difficult to put together for this question. Say I have two models, Foo and Bar. Foo has many Bar's. Bar belongs to one Foo. How do I use Foo.find to find all of the Foos that currently have zero Bars? In SQL this would translate into something like: SELECT * from foo where id NOT IN (select foo_id from bar);

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• CListBox... double-clicking makes it scroll back to top?

  - by John

  In a custom subclass of CListBox, if I scroll down it sometimes gets into a weird state where double-clicking on a list item causes the list to scroll all the way back to the top. I have no double-click handler so I'm a bit confused what might be going on, any ideas?

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• How do I serve a binary file through rack?

  - by Chris

  I think I'm being a bit silly here, but I keep getting errors complaining about the SERVER_NAME key missing from the env hash, and I can't find any substantial documentation on Rack::SendFile.. so- how do I serve up files?

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• Replace character between strings

  - by trembon

  Maybe it's just too late for me to do this, but I'm trying to replace a character between 2 string with regex in PHP. Example string: other | text [tag]text|more text|and more[/tag] end | text My goal is to replace | with <br/> between [tag] and [/tag]. Tried with this, seems it wasn't that easy though: /<td>(\|)<td>/gsi Searched a bit, but couldn't make out an answer with the stuff I found. Hope you can help, thanks

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• Using ListViews on Android?

  - by Robert

  I am just getting started with the Android SDK and I had a quick question. I am trying to set up a ListView with a rectangle of color on the left and then a bit of text for each row. I also want to make it so I can click each entry in the list and open a new activity to display some information (similar to the contact list). Anyone have any examples to help me out?

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• Port Android App to Desktop?

  - by CodeJustin.com

  I'm just wondering if it would be possible (and legal) to port an Android app to desktop? I'm creating an android game that would work well on PC too (even with the cellphone like layout) and was thinking that maybe I could 'embed' an android emulator with an installer or would that process be a bit hard for a novice Java coder?

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• How do I find the latest TimeStamp(DateTime) for each of my products in combination with another con

  - by radbyx

  Hi, I've two tables: Product: ProductID ProductName StateLog: StateLogID ProductID (Foreign Key) State (bit) TimeStramp (DateTime) I need to find the heighest StateLog.TimeStamp for each StateLog.ProductID there have the StateLog.State = 0

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• How to construct a c++ fstream from a POSIX file descriptor?

  - by BD at Rivenhill

  I'm basically looking for a C++ version of fdopen(). I did a bit of research on this and it is one of those things that seems like it should be easy, but turns out to be very complicated. Am I missing something in this belief (i.e. it really is easy)? If not, is there a good library out there somewhere to handle this?

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• How do I use PHP to grab the name of the file?

  - by Sam

  Hi, what I want to do is PHP to look at the url and just grab the name of the file, without me needing to enter a path or anything (which would be dynamic anyway). E.G. http://google.com/info/hello.php, I want to get the 'hello' bit. Help? Thanks.

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• Ruby on Rails Problem PotionStore

  - by David Schiefer

  Hello, I am trying to install the PotionStore on my Mac OS X 10.6 server with Ruby on Rails 3 installed. Upon launching the server on port 3000 and pointing safari to this address, I get this: NameError in Store/orderController#index uninitialized constant ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::PGconn What does this mean? I'm not too advanced with Ruby on Rails, so this throws me a bit.

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• importing class and its function from another file [Python]

  - by user343934

  Hi everyone, I am having little bit problem in importing classes in python. My work flow goes like this -index.py ---class template: ------def header(): ------def body(): ------def footer(): -display.py I want to call function header(), body() and footer () in my display.py page. Will anyone make me clear about this issue in python. Thanks for your concern.

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• Prinicipal component analysis c#

  - by vj4u

  Hi, im presently working with data in text files i need to use algorithm called principal component analysis so i have counted the words in text filw which occurred more than one time in text file for eg relation occured times help occured 6 times between OCCURED 3 TIMES Analysis occurred 4 times component occured 5 times present occurred 6 times so by taking count of above distinct words i need to form matrix of m x n in c# help me its bit urgent for me

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• Amazon EC2 pricing question

  - by Industrial

  Hi everyone, I took my first step today on working with cloud servers and chosed Amazon EC2 for this project. Since I am a bit of a newcomer on this, I didn't fully understand their pricing: What happens when a instance is idling with no connections being made. Does it still cost us money? It would be sad to have instances idling and costing us money when we do not use them... Thanks a lot!

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• Drupal 7: Rename files on upload (via filefield)

  - by Eugene

  Looking for a way to rename files that are uploaded by users through a filefield. For example, rename user profile photos using uniqid. I found a good solution for D6 here: http://www.wesjones.net/home/2011/03/drupal-6-how-to-change-filename-on-upload but can't find anything for D7. Another option is to use File (Field) Paths, but (1) the module causes warnings on my setup and (2) seems to be a bit of an overkill to install a general module for a very specific purpose.

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• How do I bring a processes window to the foreground on X Windows? (C++)

  - by Lorenz03Tx

  I have the PID for the process (and the name), I want to bring it to the front on linux (ubuntu). On mac I would simply do SetFrontProcess(pid), on windows I'd enumerate the windows pick out the one I wanted and call SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE); but I'm at a loss of what to do on linux. I've looked at X Lib a bit, but most/all of those functions seem to operate on windows inside your process. Thanks in advanced.

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• which loop is faster?

  - by Mansuro

  I have this loop for (it= someCollection.iterator; it.hasNext(); ) { //some code here } I changed it to: for (it= someCollection.iterator;; ) { if (!it.hasNext()) break; //some code here } The second code ran a little bit faster in unit tests in junit on eclipse. Is the second loop faster? I'm asking because the times given by Junit are not too exact, but they give an approximate value

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• asp.net mvc checkbox detailview

  - by mazhar

  I want to use checkbox in my detail view for the bit true or false field. How would i do that .

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• Is flash's geturl(...) spiderable by google?

  - by tom

  If I made a homepage with an embedded .swf which had buttons that linked to other html pages on my website using the getUrl() function, would those links be spiderable by google? Or should I also put in text links outside of the .swf (which would ruin the design a bit)? I know a lot of people will argue I shouldn't have flash as the main content on the homepage (and their comments are appreciated), but bear in mind, that's not my question.

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• how to find 2 to the power of n . n ranges from 0 to 200

  - by mousey

  Assume my system as 32 bit machine. Considering this if I use long int for n63 I will get my value as 0. How to solve it?

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• Can you explain the Output ?

  - by tuman

  What should be the output of the following code and why? I am little bit confused. int a =10; printf("%d %d %d",a,a=a+10,a);

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• Code to Display Stacked Button

  - by Daniel

  have the tweetmeme button on my site (http://SweatingTheBigStuff.com) and I want to add a facebook button BELOW it. Right now the tweetmeme settings show: float: right; margin-left: 10px; What's the best Facebook plugin for this and what settings do I need? I think the Simple Facebook Share Button should be good but I'm not sure the bit of code I should put to move it below the tweetmeme button.

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• Looping over all tabs in IE 8

  - by Quandary

  Question: I want to loop over all open tabs in Internet Exporer (for all open IE windows) and save the URL in a text file. How can I do that ? I have windows 7 32 bit and IE 8. Code for Firefox/Google chrome would also be welcome.

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• How to find an audio file's length (in seconds)

  - by mIL3S

  Hi all! (Objective C) Just using simple AudioServicesPlaySystemSoundID and its counterparts, but I can't find in the documentation if there is already a way to find the length of an audio file. I know there is AudioServicesGetPropertyInfo, but that seems to return a byte-buffer - do audio files embed their length in themselves and I can just extract it with this? Or is there perhaps a formula based on bit-rate * fileSize to convert to length-of-time? mIL3S www.milkdrinkingcow.com

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• Where can I find information on the D* or D* Lite pathfinding algorithm?

  - by tehalynn

  There are links to some papers on D* here, but they're a bit too mathematical for me. Is there any information on D*/D* Lite more geared towards beginners?

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• CSS single property classes

  - by user1490379

  As more presentational html properties get deprecated the natural response for me was to make single property CSS classes such as .text-align-left{text-align:left}. My question is, is this preferred versus inline styles? Stackoverflow actually uses quite a bit of inline styles. PS: I know this isn't really a coding question and it is likely to incite debate but stackoverflow is the largest stack exchange for code and this question does have some use for future individuals.

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