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• Using build with a has_one association in rails.

  - by espinet

  This is a really noob question but im having trouble finding the answer, is there a way in rails to have 0 or 1 association? For example, I create a user with no objects, than later on create an object for that user. I tried using build with a 'has_one' association but that blew up... The only way I see this working is using 'has_many'. The user is suppose to only have at most one of these objects, is there any way to do this?

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• domain -> subdomain - passing session data

  - by Phil Jackson

  Howdy, having a little trouble here. I have domain.co.uk setting a session. When I click on a link on domain.co.uk to go to sub.domain.co.uk the session is not being read. I have altered session.cookie_domain to .domain.co.uk not still not working. Is there anything else that needs changing? Regards, me.

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• How to install new modes in emacs 23 on OS X?

  - by estanford

  I just downloaded the Haskell and J modes off of SourceForge, and I'm having trouble figuring out how to make them interface with emacs 23. Google searches yield detailed instructions for emacs 22, but it looks like changes have been made that make it hard to figure out where I'm supposed to stick the binaries. The internal documentation seems to assume more experience with emacs internals than I currently have, and the problem has resisted solution for several days. Does anyone know how to get these modes up and running?

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• iFrame Access Problem

  - by Tom

  Hi Guys, I have data which sits outside an iframe with a script on the outside as well. When a user performs an action - I want this ata to be sent "inside" the iframe. I have having a bit trouble achieving this and was wondering whether its possible and if it is, how I can do it ? Thx

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• Why does Mercurial only have one level of rollback?

  - by Nick Pierpoint

  I understand the restrictions of rollback and the care required in its use (for example, http://www.selenic.com/mercurial/hg.1.html#rollback), but I just wondered why there is only 1 level of rollback. My guess it's a design decision and that the hassle of storing multiple previous transactional states to handle multiple levels of rollback is more trouble than its worth.

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• JPA CascadeType.ALL does not delete orphans.

  - by Paul Whelan

  I am having trouble deleting orphan nodes using JPA with the following mapping @OneToMany (cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "owner") private List<Bikes> bikes; I am having the issue of the orphaned roles hanging around the database. I can use the @org.hibernate.annotations.Cascade Hibernate specific tag but obviously I don't want to tie my solution into a hibernate implementation. Any pointers greatly appreciated.

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• 64-bit integers in Cython

  - by Homayoon

  I'm trying to interface a C++ library (pHash) with Python using Cython, but I have trouble with some of the types. The library functions use "unsigned long long" and I can't find a way to declare variables and parameters with this type. I searched for a list of the types that I can use with cdef but I found nothing. Can anyone point me to such a list (if it exists) or otherwise suggest a way to use 64 bit types in Cython? Thanks.

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• ASP.NET Hosting and routing

  - by V-Man

  Is it possible to host 2 asp.net projects off one ip address? I don't have a domain name just an ip number. I'm running IIS7. The first project runs and displays fine over the web by simply typing in the ip address into the browser but I'm having trouble accessing the second. Currently both projects have virtual directories in IIS7. Help is greatly appreciated. Thx

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• Perl: reference to subroutine in external .pm file

  - by Pmarcoen

  I'm having some trouble figuring out how to make a reference to a subroutine in an external .pm file. Right now, I'm doing this : External file package settingsGeneral; sub printScreen { print $_[0]; } Main use settingsGeneral; my $printScreen = settingsGeneral::printScreen; &$printScreen("test"); but this result into an error: Can't use string ("1") as a subroutine ref while "strict refs" in use

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• what is the best way to track unique visitors?

  - by dnkira

  hello what i want is to make user counter as true as possible. exluding bots, and clever users as much as possible. as 4 what i know, it can be done in several ways: ip (trouble with dinamic ones and proxy's) cookies (with session id maybe, but can be deleted or browser can be changed) flash cookies (not all users have it) any other ways? and what is the best?

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• C++ indentation not working on Vim

  - by ajay

  Hi, I am having trouble getting indentation to work in Vim. I am coding in C++. I use vim.nox on ubuntu 9.10 I have filetype plugin indent on I also tried set cident , set autoindent, set smartindent etc. Automatic indentation does not seem to work.

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• Chat client with GWT

  - by user284016

  What would be the best way to create a JS chat client with GWT? The bit that I'm having trouble with is the persistence and transfer of the messages. Should I store the messages in a DB and check the db for new messages? Is there a much better way to do this?

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• C# WebClient list

  - by Linton day

  Hello Im trying to make a chat program like skype in c# and having some trouble gavring/updating the messages, what i tryed was foreach value in a database add it into listbox1, and i did a timer every second do that.. but it kept adding it again every second repeating like it was on loop So then i sat down and thought how can i do this, so i come up with webclient download a list of messages by php and foreach line in the webclient add it to a listbox! is there any way of doing this?

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• Event driven programming in perl?

  - by TheGNUGuy

  Hey everyone, I'm trying to make a jabber bot and I am having trouble keeping it running while waiting for messages. How do I get my script to continuously run? I have tried calling a subroutine that has a while loop that I , in theory, have set up to check for any messages and react accordingly but my script isn't behaving that way. Here is my source: http://pastebin.com/03Habbvh

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• void foo(int &x) -> Ruby? Passing integers by reference?

  - by Earlz

  Hello, as a way to spice up my C++ programming homework, I've decided to instead of typing the C++ from the book onto my computer, instead reforming it in Ruby. Yes it's a bit silly, but I'm bored. Anyway, I'm having trouble converting this kind of function to Ruby void swap(int &a,int &b){ int c=b; b=a; a=c } What would the equivalent ruby code looking inside a function ?

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• ASP.net MVC How to change the Textbox Class upon validation failure?

  - by Harry

  I notice in the default MVC template project that the Account registration fields are highlighted via a class change. I can't seem to get the same behavour out of my own code (in the same project - same CSS etc) What might be stopping this from occuring? Update I believe this relates to one of my other questions Because I was having trouble with NullReferenceExceptions I have changed the Html.ValidationMessage fields to have different names than the target fields. So really, I need to resolve this question

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• wchar to char in c++

  - by Chris

  I have a Windows CE console application that's entry point looks like this int _tmain(int argc, _TCHAR* argv[]) I want to check the contents of argv[1] for "-s" convert argv[2] into an integer. I am having trouble narrowing the arguments or accessing them to test. I initially tried the following with little success if (argv[1] == L"-s") I also tried using the narrow function of wostringstream on each character but this crashed the application. Can anyone shed some light? Thanks

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• Read a file form web-app

  - by Steve Brewer

  Inside a grails application, I need to upload a file under web-app/js, add a prefix, and put it in S3. I'm having trouble figuring out how to read the js file in a way that will work in development (/web-app/js) and production (/js). I'm doing this from inside a domain object.

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• Zend Framework: Controller Plugins vs Action Helpers

  - by Laimoncijus

  Could someone give few tips and/or examples how Controller Plugins and Action Helpers are different? Are there situations where particular task could be accomplished with one but not another? For me they both look more or less the same and I'm often having trouble having to decide when to use what... Are there any big differences?

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• Apache Rewrite Exclusion

  - by dtufano

  Hey guys! I'm having trouble figuring out how to exclude /public/bin from this rewrite rule RewriteCond %{REQUEST_URI} !firerift.php RewriteRule ^(.*)$ firerift.php/$1 [L,QSA,NC] Any help would be appreciated.

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• How do I force cmake to link MSVCR.dll statically in windows XP?

  - by Gtker

  Currently it's linking it dynamically,causing much trouble for me(missing msvcr80.dll). How should I instruct cmake to link it statically?

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• How to move value from the stack to ST(0)?

  - by George Edison

  I am having trouble believing the following code is the most efficient way to move a value from the stack to ST(0): .data var dd 4.2 tmp dd ? .code mov EAX, var push EAX ; top of stack now contains a value ; move it to ST(0) pop EAX mov tmp, EAX fld tmp Is the temporary variable really necessary? Further, is there an easier way to get a value from the stack to ST(0)?

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• What's the simplest way to make a scrollable list of controls with labels?

  - by Jon Cage

  Using C++/CLI and Windows Forms, I'm trying to make a simple scrollable list of labelled text controls as a way of displaying some data fields. I'm having trouble making a TableLayoutPanel scrollable - every combination of properties I've tried seems to result in some really peculiar side effects. So I have two questions: Is this the best way to do it. If it is a reasonable approach, what magic combination of settings should I apply to the table layout panel to make it play ball?

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• how to load a file into a blob without loading into RAM first?

  - by Ace Grace

  Hi, I am using C# and I am having trouble loading large files into a binary field use byte arrays. Basically, if I load a file that is too large, I get memory problems. Is there a way to load a file into a binary field without using large amounts of ram, i.e. avoid loading the file into memory first? If it helps, I am using Advantage Database Server and this is using a winforms app not a web app. Regards

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• passing an array struture as an array

  - by Matias

  I'm having trouble passing a struture array as a parameter of a funtion struct Estructure{ int a; intb; }; and a funtion Begining(Estructure &s1[]) { //modifi the estructure s1 }; and the main would be something like this int main() { Estructure m[200]; Begining(m); }; is this valid?

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