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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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• What is the difference between a stream and a reader in Java?

  - by Bragaadeesh

  Hi, Today I got this question for which I think I answered very bad. I said stream is a data that flows and reader is a technique where we read from that is a static data. I know this is an awful answer, so please provide me the crisp difference and definitions between these two with example in Java. Thanks.

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• which text writing classes are the most efficient for writing lots of small files?

  - by Robert H

  I have to write 300+ files to a server share on a hourly basis. A quick implementation using CreateText takes approximately 1.4 seconds per file. I know there is a better way to do this, but I am unsure which way is actually the quickest/most efficient; hence my question: Which text writing class is the most efficient for writing hundreds of small files ( 336 bytes on average ) to a server share?

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• Where to place a debug log files for my daemon app?

  - by sasayins

  Hi, I am using C language and Linux as my programming platform. I am learning how to create a daemon, and I want to create a log file so that I write a debug message in my daemon. My question is where should I put the log file in my system. Should I put it in the var folder? Please advice. Many thanks.

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• Help understanding unipolar transfer function

  - by locky28

  There is a question I am stuck on using the following formula for the unipolar transfer function: f(net)= 1 __________ -net 1 + e The example has the following: out = 1 ____________ = 0.977 -3.75 1 + e How do we arrive at 0.977? What is e?

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• How many integers 0 < n < 10E18 have the property that the sum of the digits of n equals the sum of digits of 137n?

  - by Allen

  I'm stumped on a project Euler question, #290. Can anybody point me in the right direction? i = 0 o = 0 p = 1 while i < 10 ** 18 j = i.to_s.split('').map(&:to_i) k = j.inject(:+) l = 137 * i m = l.to_s.split('').map(&:to_i) n = m.inject(:+) if k == n o += 1 end if i == (9 * 10 ** p) * (10 ** p) i += 18 p += 1 o += 1 else i += 9 end end puts o

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• How to determine whether a linked list contains a loop?

  - by ET

  During a preparation for a job interview, I encountered the following question: How can you determine whether a linked list (of any type) contains a loop, using additional space complexity of O(1)? You cannot assume that the loop starts at the first node (and of course, the loop doesn't have to contain all nodes). I couldn't find the answer, though I have the feeling it's quite simple...

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• How to launch a dependent application on OS X?

  - by jldupont

  What is the programmatical mechanism by which an application can be launched at a result of another one being launched? E.g. upon launching iTunes, the Last.fm desktop launches too. Or it is just a question of substituting a "batch file" of some sort? Note: OS X newbie.

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• Using NetBeans for multiple programming languages

  - by mawg

  I am looking for a cross platform RAD IDE with GUI building. NetBeans looks right (or am aI wrong?). However, I may want to code somethings in C++ and some in Python. It looks like both are supported, but I am not sure if I need to install two copies of NetBeans or if one can handle both programming languages. Sorry it's such a st00pid n00b question - can anyone tell me quickly? Thanks

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• What is going to be "the next Hype" ? [closed]

  - by kabado

  I know it's a very vague question, but maybe the answers could act like a poll about what could possibly be the next big event in computer science. A new language ? A new technology ? A new architecture ? A new business model ? Please provide details, what is it and why do you think it's going to rule the world.

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• php joomla session lifetime settings

  - by jtanmay

  I have searched through the google and also joomla forums but didn't got what exactly I was looking for. My main purpose is to set the joomla session live for ever. Many forums says its not good to keep a higher value (security issues) but I don't want to consider that right now. My question is : What if I set the session lifetime value to "0" (Zero), will the session be active for ever? or the user will NOT be able to login completely? Thanks, Tanmay

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• AS3: why is this happening?

  - by Bin Chen

  Hi, I just encounter a strange problem: var a:ClassA = new ClassA; var b:ClassA = a; The program keeps running sometime, the a = null, b = null. The program is a complex one, I am sure that no part will touch a, and b. My question is, will the runtime(garbage collector) to collect the memory of "a" and then assign a and b to null? I am confused, thanks!

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• Ordering of reflection requests in dotnet

  - by happyclicker

  When I call GetProperties() on a type, the properties are ordered as they are written in the source code. This is very handy but my question is, if this is a guaranteed behavior or may this change depending on the runtime version and the environment. Does anyone know something about that?

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• cURL command to PHP's libcurl?

  - by Daddy Warbox

  curl -is -F 'J:A-login=BTDT::Action::Login' -F 'J:A:F-address-login=EMAILADDRESS' -F 'J:A:F-password-login=PASSWORD' http://hiveminder.com/splash | grep -o 'JIFTY_SID_HIVEMINDER=[0-9a-f]\+' In continuation off of this question.

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• JSON | Django passing python list

  - by MMRUser

  Hi, I'm trying to send a Python list in to client side (encoded as JSON), this is the code snippet which I have written: array_to_js = [vld_id, vld_error, False] array_to_js[2] = True jsonValidateReturn = simplejson.dumps(array_to_js) return HttpResponse(jsonValidateReturn, mimetype='application/json') So my question is how to access it form client side, can I access it like this: jsonValidateReturn[0] or how I assign a name to the returned JSON array in order to access it?

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• Scope of const char*

  - by Neeraj

  Consider this code: const char* someFun() { // ... some stuff return "Some text!!" } int main() { { // Block: A const char* retStr = someFun(); // use retStr } } My question is in the function sumFun() where is "some Text!!", stored (i think may be in some static area in ROM) and what will be its scope? Will the memory pointed by retStr be occupied throughout the program or be released once the block A exits? -- Thanks

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• Difference between Locks, Mutex and Critical Sections

  - by viswanathan

  There is an existing question regarding difference between Mutex and Critical section but it does not deal with Locks also. So i want to know whether Critical sections can be used for thread synchronisation between processes. Also what is meant by signalled states and non-signalled states

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• Wordpress Hooks vs. includes?

  - by Chris J. Lee

  This is somewhat a subjective question. Noticed themes like thematic and carrington use hooks to display their themes. Trying to figure out which works best for a more efficient workflow. Which seems more efficient at theming? Trying to weigh in the cons and pros of hooks vs. just including static files.

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• Does listening to music while programming increase one's productivity?

  - by jmvidal

  Or am I just wasting my time singing along to Rush? "You can choose a ready guide..." Please note that if you close this question you will kill the spirit of radio.

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• Anything like GROUP BY that gives you the max value'd field instead of the min?

  - by William

  I'm trying to get the results from this question (SO 2429348 - Help with a SQL query) except I need it to return values 1 and 3.

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• The .NET SDK Programs - What does each tool do?

  - by Kyle Rozendo

  My question is simple. What do they do? The accepted answer below is a list of the .NET SDK Tools that come in the framework.

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• Does anyone know what is the 32 character string before the product image filename in Magento ?

  - by Daniel Higgins

  I ask this question, since I am trying to get the images I have just copied from Domain A to work in Domain B, (which is using the same database). http://DOMAIN_A/magento/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/b/0/b0041-1.jpg I think knowing what the 32 character string is, which help me find a good explanation why the images are not being found in the front or backend of Magento after reinstall on DOMAIN B. RE: Magento version 1.4.0.1

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• Include HTML file as embedded resource

  - by Stacey

  A followup to another question I did, I've done some more digging but I am still coming up dry. Is there any way to include .HTML/.ASPX files as 'embedded resources' into an ASP.NET MVC application? I've found lots of examples of using string resources, but never other files entirely.

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• What do you do when a client ask for a feature which is a really bad idea?

  - by TAG

  Recently there was a SO question asking how to implement a feature which blocked users from copying text from a page in their browser. There were many negative comments on this feature, both because it's not practically possible to implement effectively and because it will interfere with the users' experience? What's a programmer to do in these sorts of situations in dealing with their clients or employers?

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• Does Poco C++ library have a cross platform WaitForMultipleObjects() analog?

  - by Tim

  Based on this question I am going to use Poco::NamedEvent, but I need to wait for multiple events (like win32 WaitForMultipleObjects() Is there such a thing in poco? (searching the docs doesn't yield much but perhaps I am not using the right searches)

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