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• Unable to reverse seemingly simple rails migration - getting "altered_table.column may not be NULL"

  - by brad

  I have a table 'invoices' in my development database (sqlite3) populated with a small amount of test data. I wanted to add a column 'invoice_number' to it and set up a migration like so: class AddInvoiceNumberColumnToInvoices < ActiveRecord::Migration def self.up add_column :invoices, :invoice_number, :integer end def self.down remove_column :invoices, :invoice_number end end I ran rake db:migrate and it seemed to migrate just fine. However, when I tried to access this column through ActiveRecord it didn't seem to be there. I decided to undo this migration and try again (not sure what I was going to try but I thought I'd start by undoing it) with rake db:migrate VERSION='whatever_the_migration_before_this_one_was_called'. This failed with the error message == AddInvoiceNumberColumnToInvoices: reverting =============================== -- remove_column(:invoices, :invoice_number) rake aborted! An error has occurred, this and all later migrations canceled: altered_invoices.invoice_number may not be NULL I can't find any documentation of this error. Is anyone able to explain what I have done wrong, and more importantly how I can fix this?

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• "SecondViewController" may not respond to '-updatePlayerQueueWithMedia:' Messages without a matching

  - by Pavan

  I don't understand whats happening I get a warning that says "SecondViewController" may not respond to '-updatePlayerQueueWithMedia:' Messages without a matching signature will be assumed to return 'id' and accept '...' as arguments. this is my method - (void)mediaPicker: (MPMediaPickerController *) mediaPicker didPickMediaItems: (MPMediaItemCollection *) mediaItemCollection { [self dismissModalViewControllerAnimated: YES]; [self updatePlayerQueueWithMediaCollection: mediaItemCollection]; } And the actual method which ive written in the same page is - (void) updatePlayerQueueWithMediaCollection: (MPMediaItemCollection *) mediaItemCollection { //and shit happens here. } I don't understand whats happening can someone please help me get rid of this warning.

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• Efficient JSON encoding for data that may be binary, but is often text

  - by Evgeny

  I need to send a JSON packet across the wire with the contents of an arbitrary file. This may be a binary file (like a ZIP file), but most often it will be plain ASCII text. I'm currently using base64 encoding, which handles all files, but it increases the size of the data significantly - even if the file is ASCII to begin with. Is there a more efficient way I can encode the data, other than manually checking for any non-ASCII characters and then deciding whether or not to base64-encode it? I'm currently writing this in Python, but will probably need to do the same in Java, C# and C++, so an easily portable solution would be preferable.

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• NSNotification center may not respond to -object ?

  - by blackkettle

  Hi, I'm trying to make simple use of the NSNotification center inside my iPhone application, but I seem to be doing something wrong in this case. I was under the impression that it was possible to retrieve an object associated with a particular message, or at least a reference to the object, but using the following example code I'm getting a warning, "NSNotification center may not respond to -object" - (void)addNewBookmark:(NSNotificationCenter *)notification { Bookmark *newBookMark = (Bookmark *)[notification object]; //Do some stuff with the bookmark object } Indeed, when I compile and run the code, basically nothing I try to do with the contents of the object actually gets carried out - it's simply ignored. The post code is as follows, - (IBAction)save:(id) sender{ //Sending the message with the related object [[NSNotificationCenter defaultCenter] postNotificationName:@"addNewBookmark" object:bookmark]; } and the bookmark object itself is just a dictionary. I also tried using the "userInfo" argument and passing the bookmark object through that, but the result was the same. How should I be doing this? What am I doing wrong?

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• error: typedef name may not be a nested-name-specifier

  - by Autopulated

  I am trying to do something along the lines of this answer, and struggling: $ gcc --version gcc (GCC) 4.2.4 (Ubuntu 4.2.4-1ubuntu4) file.cpp:7: error: template argument 1 is invalid file.cpp:7: error: typedef name may not be a nested-name-specifier And the offending part of the file: template <class R, class C, class T0=void, class T1=void, class T2=void> struct MemberWrap; template <class R, class C, class T0> struct MemberWrap<R, C, T0>{ typedef R (C::*member_t)(T0); typedef typename boost::add_reference<typename T0>::type> TC0; // <---- offending line MemberWrap(member_t f) : m_wrapped(f){ } R operator()(C* p, TC0 p0){ GILRelease guard; return (p->*(this->m_wrapped))(p0); } member_t m_wrapped; };

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• Scala: "Parameter type in structural refinement may not refer to an abstract type defined outside th

  - by raichoo

  Hi, I'm having a problem with scala generics. While the first function I defined here seems to be perfectly ok, the compiler complains about the second definition with: error: Parameter type in structural refinement may not refer to an abstract type defined outside that refinement def >>[B](a: C[B])(implicit m: Monad[C]): C[B] = { ^ What am I doing wrong here? trait Lifter[C[_]] { implicit def liftToMonad[A](c: C[A]) = new { def >>=[B](f: A => C[B])(implicit m: Monad[C]): C[B] = { m >>= (c, f) } def >>[B](a: C[B])(implicit m: Monad[C]): C[B] = { m >> a } } } IMPORTANT: This is NOT a question about Monads, it's a question about scala polymorphism in general. Regards, raichoo

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• Collection was modified; enumeration operation may not execute

  - by Rita

  I have the below code. I am trying to remove the record and it is throwing Exception when it is removing the Record. "Collection was modified; enumeration operation may not execute." Any ideas on how to get rid of the message. Appreciate your time. //validClaimControlNo has valid ClaimControl Numbers. List<string> validClaimControlNo = new List<string>(); int count = 0; foreach (List<Field> f in records) { foreach (Field fe in f) { if (i == 0) if (!(validClaimControlNo.Contains(fe.Value))) { //if this claim is not in the Valid list, Remove that Record records.RemoveAt(count); } i++; } i = 0; count++; }

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• Warning of "Control may reach end of non-void function"

  - by Cloud_cal

  I ran a C++ program in Xcode, and encountered a warning of "Control may reach end of non-void function". Here is the code: Node* search(Node* head, int x) { if(!head) return NULL; else if(x == head->key) return head; else if(x < head->key) search(head->lchild, x); else search(head->rchild, x); } I got the same warning when compiling it in Linux, but got the correct result. But in Xcode, the result was wrong. By the way, I got the correct answer and no warning in Visual Studio.

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• Why does ruby-debug say 'Saved frames may be incomplete'

  - by Chris McCauley

  From time-to-time I get this when a breakpoint is triggered. It looks like stack frames aren't getting saved so I can't step back through the call stack - a real pain. See below for an example --> #0 BatchProcess.add_failure_record(row_id#Fixnum, test#Struct::Test, message#String,...) at line server/processes/batch.rb:309 Warning: saved frames may be incomplete; compare with caller(0). (rdb:1) pp caller ["./server/processes/batch.rb:309:in `run_tests'", "./server/processes/common/generic_process.rb:219:in `each'", "./server/processes/common/generic_process.rb:219:in `run_tests'", "./server/processes/common/generic_process.rb:271:in `run_plan'", "./server/processes/common/corrections.rb:19:in `each_with_index'", "./server/processes/common/generic_process.rb:266:in `each'", "./server/processes/common/generic_process.rb:266:in `each_with_index'", "./server/processes/common/generic_process.rb:266:in `run_plan'", "./server/processes/batch.rb:202:in `run_engine'", "/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'", "./server/processes/batch.rb:201:in `run_engine'", "./server/processes/common/generic_process.rb:88:in `run_dataset'", "./server/processes/batch.rb:210:in `run_dataset'", "/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'", "./server/processes/batch.rb:209:in `run_dataset'", "./server/processes/common/generic_process.rb:159:in `run'", "./server/processes/common/generic_process.rb:158:in `each'", "./server/processes/common/generic_process.rb:158:in `run'", "./server/processes/batch.rb:350:in `run'", "/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'", "./server/processes/batch.rb:349:in `run'", "server/processes/test_runs/run_tests.rb:55:in `run_one_process'", "server/processes/test_runs/run_tests.rb:81"] Any ideas on how to stop this happening?

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• xcode may not respond to warning

  - by Frames84

  Hi all, Can't seem to get rid of a warning. The warning is: 'UIImage' may not respond to '-scaleToSize' above the @implmentation MyViewController I have this @implementation: @implementation UIImage (scale) -(UIImage*)scaleToSize:(CGSize)size { UIGraphicsBeginImageContext(size); [self drawInRect:CGRectMake(0, 0, size.width, size.height)]; UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return scaledImage; } @end Then I have MyViewController implementation @implementation TodayNewsTableViewController @synthesize dataList; ...... - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *MainNewsCellIdentifier = @"MainNewsCellIdentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: MainNewsCellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier: MainNewsCellIdentifier] autorelease]; } NSUInteger row = [indexPath row]; NSDictionary *stream = (NSDictionary *) [dataList objectAtIndex:row]; NSString *title = [stream valueForKey:@"title"]; if( ! [title isKindOfClass:[NSString class]] ) { cell.textLabel.text = @""; } else { cell.textLabel.text = title; } cell.textLabel.numberOfLines = 2; cell.textLabel.font =[UIFont systemFontOfSize:10]; cell.detailTextLabel.numberOfLines = 1; cell.detailTextLabel.font= [UIFont systemFontOfSize:8]; cell.detailTextLabel.text = [stream valueForKey:@"created"]; NSString *i = [NSString stringWithFormat:@"http://www.mywebsite.co.uk/images/%@", [stream valueForKey:@"image"]]; NSData *imageURL = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:i]]; UIImage *newsImage = [[UIImage alloc] initWithData:imageURL] ; UIImage *scaledImage = [newsImage scaleToSize:CGSizeMake(50.0f, 50.0f)]; // warning is appearing here. cell.imageView.image = scaledImage; [imageURL release]; [newsImage release]; return cell; } Thanks for your time in advance. Frames

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• How I May Have Taken A Wrong Path in Programming

  - by Ygam

  I am in a major stump right now. I am a BSIT graduate, but I only started actual programming less than a year ago. I observed that I have the following attitude in programming: I tend to be more of a purist, scorning unelegant approaches to solving problems using code I tend to look at anything in a large scale, planning everything before I start coding, either in simple flowcharts or complex UML charts I have a really strong impulse on refactoring my code, even if I miss deadlines or prolong development times I am obsessed with good directory structures, file naming conventions, class, method, and variable naming conventions I tend to always want to study something new, even, as I said, at the cost of missing deadlines I tend to see software development as something to engineer, to architect; that is, seeing how things relate to each other and how blocks of code can interact (I am a huge fan of loose coupling) i.e the OOP thinking I tend to combine OOP and procedural coding whenever I see fit I want my code to execute fast (thus the elegant approaches and refactoring) This bothers me because I see my colleagues doing much better the other way around (aside from the fact that they started programming since our first year in college). By the other way around I mean, they fire up coding, gets the job done much faster because they don't have to really look at how clean their codes are or how elegant their algorithms are, they don't bother with OOP however big their projects are, they mostly use web APIs, piece them together and voila! Working code! CLients are happy, they get paid fast, at the expense of a really unmaintainable or hard-to-read code that lacks structure and conventions, or slow executions of certain actions (which the common reasoning against would be that internet connections are much faster these days, hardware is more powerful). The excuse I often receive is clients don't care about how you write the code, but they do care about how long you deliver it. If it works then all is good. Now, did my "purist" approach to programming may have been the wrong way to start programming? Should I just dump these purist concepts and just code the hell up because I have seen it: clients don't really care how beautifully coded it is?

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• Designing model/database for distance between any two locations (that may change)

  - by Yo Ludke

  We should create a web app which has a number of events each with a location (created as user-generated content, so the number of events will be increasingly large). The distance between any events should be available, for example to determine the top 5 closest events and such things. Users may change the locations of events. How should one design the database/model for this (in a scalable way)? I was thinking of doing it with a "distance table" (like so http://www.deutschland-tourist.info/images/entfernungstabelle.gif). Then every time, if a location changes, one row and one column have to be recalculated (this should be done with a delayed job, because it is not important to have the changes instantly). Possible problems in Scaling: Database to large (n² items for n events), too much calculation to be done. For example we should see if this is okay for 10.000 users. If each has created just one event, then this would be 100 million integers... Do you think this would be a good way to do it efficiently? How could one realize such a distance table with an rails model? Is it possible with a SQL databse? Would you start other approaches?

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• May volatile be in user defined types to help writing thread-safe code

  - by David Rodríguez - dribeas

  I know, it has been made quite clear in a couple of questions/answers before, that volatile is related to the visible state of the c++ memory model and not to multithreading. On the other hand, this article by Alexandrescu uses the volatile keyword not as a runtime feature but rather as a compile time check to force the compiler into failing to accept code that could be not thread safe. In the article the keyword is used more like a required_thread_safety tag than the actual intended use of volatile. Is this (ab)use of volatile appropriate? What possible gotchas may be hidden in the approach? The first thing that comes to mind is added confusion: volatile is not related to thread safety, but by lack of a better tool I could accept it. Basic simplification of the article: If you declare a variable volatile, only volatile member methods can be called on it, so the compiler will block calling code to other methods. Declaring an std::vector instance as volatile will block all uses of the class. Adding a wrapper in the shape of a locking pointer that performs a const_cast to release the volatile requirement, any access through the locking pointer will be allowed. Stealing from the article: template <typename T> class LockingPtr { public: // Constructors/destructors LockingPtr(volatile T& obj, Mutex& mtx) : pObj_(const_cast<T*>(&obj)), pMtx_(&mtx) { mtx.Lock(); } ~LockingPtr() { pMtx_->Unlock(); } // Pointer behavior T& operator*() { return *pObj_; } T* operator->() { return pObj_; } private: T* pObj_; Mutex* pMtx_; LockingPtr(const LockingPtr&); LockingPtr& operator=(const LockingPtr&); }; class SyncBuf { public: void Thread1() { LockingPtr<BufT> lpBuf(buffer_, mtx_); BufT::iterator i = lpBuf->begin(); for (; i != lpBuf->end(); ++i) { // ... use *i ... } } void Thread2(); private: typedef vector<char> BufT; volatile BufT buffer_; Mutex mtx_; // controls access to buffer_ };

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• ADFS 2.0 - ID3206 - A signin response may only redirect within the current web application

  - by MattK

  I've recently bumped into this issue: http://social.msdn.microsoft.com/Forums/en-US/Geneva/thread/adcdd533-d5e3-4af9-b3f5-b9a6d06b5c44?prof=required Does anyone have any ideas around this?

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• iPhone OS 3.2 - How to register for notifcations that may not be available

  - by cdstamper

  So I'm trying to register for the MPMoviePlayerDidExitFullscreenNotification notification in my universal app (iPhone and iPad). Problem is, OS 3.1.3 doesn't support this notification, and just crashes. I've tried version checking, like so: if ([MPMoviePlayerController instancesRespondToSelector:@selector(setShouldAutoplay:)]) {//Check for shouldSetAutoplay, this ensures that we are running at least 3.2 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerDidFinish:) name:(NSString*)class2 object:[self player]]; Doesn't work, still crashes. How do I do this?

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• May I define aliases elsewhere than into .bashrc ?

  - by Luc M

  We are several persons using the same login id on Linux Box. I want to define my own aliases without interfering with anyone. In the .bashrc, I define a alias to my bash file defining my own aliases. alias luc=/full/path/to/my/def_alias_luc.sh The file /full/path/to/my/def_alias_luc.sh contains #!/bin/bash echo "" echo "Defining Luc's aliases" echo "" echo "" echo "aliases before..." echo "" alias alias vimluc="vim -u /full/path/to/my/.vimrc " echo "" echo "aliases after" echo "" alias After executing /full/path/to/my/def_alias_luc.sh, the alias is still undefined. What do I miss ?

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• MEF = may experience frustration?

  - by Dave

  Well, it's not THAT bad yet. :) But I do have questions after Reed has pointed me at MEF as a potential alternative to IoC (and so far it does look pretty good). Consider the following model: As you can see, I have an App, and this app uses Plugins (whoops, missed that association!). Both the App and Plugins require usage of an object of type CandySettings, which is found in yet another assembly. I first tried to use the ComposeParts method in MEF, but the only way I could get this to work was to do something like this in the plugin code. var container = new CompositionContainer(); container.ComposeParts(this, new CandySettings()); But this doesn't make any sense, because why would I want to create the instance of CandySettings in the plugin? It should be in the App. But if I put it in the App code, then the Plugin doesn't magically figure out how to get at ICandySettings, even though I am using [Import] in the plugin, and [Export] in CandySettings. The way I did it was to use MEF's DirectoryCatalog, because this allows the plugin, when constructed, to scan all of the assemblies in the current folder and automagically import everything that is marked with the [Import] attribute. So it looks like this, and potentially in every plugin: var catalog = new DirectoryCatalog( "."); var container = new CompositionContainer( catalog); container.ComposeParts( this); This totally works great, but I can't help but think that this is not how MEF was intended to be used?

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• Can operator= may be not a member?

  - by atch

  Having construction in a form: struct Node { Node():left_(nullptr), right_(nullptr) { } int id_; Node* left_; Node* right_; }; I would like to enable syntax: Node parent; Node child; parent.right_ = child; So in order to do so I need: Node& operator=(Node* left, Node right); but I'm getting msg that operator= has to be a member fnc; Is there any way to circumvent this restriction?

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• apache mod_rewrite rule in httpd.conf for modifying some paths, but not others

  - by wallyk

  I'm having quite a challenge creating an appropriate rewrite rule for Apache/2.2.14 on Fedora 10. I'm working through the CodeIgniter-Doctrine tutorial which uses an .htaccess file. (Search for Removing “index.php” from CodeIgniter urls about 10% down.) But since that's not recommended for a production server, I'm trying to tweak it to work in /etc/httpd/conf/httpd.conf. <VirtualHost *:80> ServerName ci_doctrine DocumentRoot /var/www/html/ci_doctrine ErrorLog /var/log/httpd/cid-error_log CustomLog /var/log/httpd/cid-access_log common <IfModule mod_rewrite.c> RewriteEngine on RewriteLog /var/log/httpd/cid_rewrite RewriteLogLevel 9 # RewriteCond ^/css/style.css$ (these have bad syntax, but that's beside the point) # RewriteRule ^/css/style.css$ /css/style.css [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /index.php/$1 [L] </IfModule> <IfModule !mod_rewrite.c> ErrorDocument 404 /ci_doctrine/index.php </IfModule> </VirtualHost> It seems like the tutorial .htaccess rules properly test for existing files and then not alter the URL in such cases, but the rewrite log says that the conditions are true (that is, the file does not exist) even though it's there. 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) init rewrite engine with requested uri /login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (3) applying pattern '^(.*)$' to uri '/login' 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (4) RewriteCond: input='/login' pattern='!-f' => matched 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (4) RewriteCond: input='/login' pattern='!-d' => matched 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) rewrite '/login' -> '/index.php//login' 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) local path result: /index.php//login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) prefixed with document_root to /var/www/html/ci_doctrine/index.php/login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (1) go-ahead with /var/www/html/ci_doctrine/index.php/login [OK] 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) init rewrite engine with requested uri /login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (3) applying pattern '^(.*)$' to uri '/login' 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (4) RewriteCond: input='/login' pattern='!-f' => matched 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (4) RewriteCond: input='/login' pattern='!-d' => matched 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) rewrite '/login' -> '/index.php//login' 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) local path result: /index.php//login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) prefixed with document_root to /var/www/html/ci_doctrine/index.php/login 127.0.0.1 - - [03/May/2010:23:26:56 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (1) go-ahead with /var/www/html/ci_doctrine/index.php/login [OK] 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) init rewrite engine with requested uri /css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (3) applying pattern '^(.*)$' to uri '/css/style.css' 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (4) RewriteCond: input='/css/style.css' pattern='!-f' => matched 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (4) RewriteCond: input='/css/style.css' pattern='!-d' => matched 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) rewrite '/css/style.css' -> '/index.php//css/style.css' 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) local path result: /index.php//css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (2) prefixed with document_root to /var/www/html/ci_doctrine/index.php/css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#167e8e0/initial] (1) go-ahead with /var/www/html/ci_doctrine/index.php/css/style.css [OK] 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) init rewrite engine with requested uri /css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (3) applying pattern '^(.*)$' to uri '/css/style.css' 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (4) RewriteCond: input='/css/style.css' pattern='!-f' => matched 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (4) RewriteCond: input='/css/style.css' pattern='!-d' => matched 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) rewrite '/css/style.css' -> '/index.php//css/style.css' 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) local path result: /index.php//css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (2) prefixed with document_root to /var/www/html/ci_doctrine/index.php/css/style.css 127.0.0.1 - - [03/May/2010:23:26:58 --0700] [ci_doctrine/sid#13c1868][rid#16848f8/subreq] (1) go-ahead with /var/www/html/ci_doctrine/index.php/css/style.css [OK] The file .../css/style.css was working properly before I started messing around with the rewrite rules, so it should be in the right place. But now the path is always munged up by the rewriting, though the virtual components below index.php are properly translated. What am I doing wrong?

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• May a NSManagedObjectContext re-fault objects automatically?

  - by frenetisch applaudierend

  I am trying to create an application which allows background threads to update core data objects while the user might be reading the same data. My approach to this would be to use multiple NSManagedObjectContexts and then before a background thread does a -save: operation, I fetch the object the user is currently working on and fire the fault for all its properties and relationships recursively. This way I have all objects the user could act with in my NSManagedObjectContext without seeing the already updated values. But this can only work if the NSManagedObjectContext cannot decide himself that e.g. memory usage is too high, and starts faulting objects which I do not explicitly reference (other than through the NSManagedObject relationship). So the question is, can the NSManagedObjectContext decide that an object needs to be re-faulted, without intervention from my side? Thanks for your effort, Markus

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• How to stop a random ramp in FCGI Processes Killing the server

  - by Andy Main

  So got the below earlier to day... Around that time the logs show a ramp in processes(600) and associated memory (1.2g), cpu usage load average (80) untill the server gave out. Server had to be hard reset by host as there was no ssh or plesk panel access. Fast CGI is configured as below and is setup for one high use site. As I understand it FcgidMaxProcesses 20 should protect against what happen but has not. I've read many forums with differing answers and references to many different fcgi directives, but have found nothing conclusive. Any one got some definitive answers on how to stop this sort of server process ramping and subsequent server failure? If you need more info let me know. Cheers Andy  /var/log/apache2/error_log [Thu May 17 07:40:47 2012] [warn] mod_fcgid: process 17651 graceful kill fail, sending SIGKILL [Thu May 17 07:40:47 2012] [warn] mod_fcgid: process 17650 graceful kill fail, sending SIGKILL [Thu May 17 07:40:47 2012] [warn] mod_fcgid: process 17649 graceful kill fail, sending SIGKILL [Thu May 17 07:40:47 2012] [warn] mod_fcgid: process 17644 graceful kill fail, sending SIGKILL [Thu May 17 07:40:47 2012] [warn] mod_fcgid: process 17643 graceful kill fail, sending SIGKILL [Thu May 17 07:40:47 2012] [warn] mod_fcgid: process 17638 graceful kill fail, sending SIGKILL [Thu May 17 07:40:47 2012] [warn] mod_fcgid: process 17633 graceful kill fail, sending SIGKILL [Thu May 17 07:40:47 2012] [warn] mod_fcgid: process 17627 graceful kill fail, sending SIGKILL [Thu May 17 07:40:47 2012] [warn] mod_fcgid: process 17622 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17674 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17673 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17672 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17667 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17666 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17665 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17664 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17659 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17658 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17657 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17656 graceful kill fail, sending SIGKILL [Thu May 17 07:40:51 2012] [warn] mod_fcgid: process 17651 graceful kill fail, sending SIGKILL https://docs.google.com/a/thesugarrefinery.com/open?id=0B_XbpWChge0VRmFLWEZfR2VBb2M https://docs.google.com/a/thesugarrefinery.com/open?id=0B_XbpWChge0VWTcwZEhoV2Fqejg https://docs.google.com/a/thesugarrefinery.com/open?id=0B_XbpWChge0VUUtVWWFINHZjZ0U https://docs.google.com/a/thesugarrefinery.com/open?id=0B_XbpWChge0VZEVMclh6ZUdaOUE <IfModule mod_fcgid.c> <IfModule !mod_fastcgi.c> AddHandler fcgid-script fcg fcgi fpl </IfModule> FcgidIPCDir /var/lib/apache2/fcgid/sock FcgidProcessTableFile /var/lib/apache2/fcgid/shm FcgidIdleTimeout 40 FcgidProcessLifeTime 30 FcgidMaxProcesses 20 FcgidMaxProcessesPerClass 20 FcgidMinProcessesPerClass 0 FcgidConnectTimeout 30 FcgidIOTimeout 120 FcgidInitialEnv RAILS_ENV production FcgidIdleScanInterval 10 FcgidMaxRequestLen 1073741824 </IfModule>

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• Silverlight IDE for latest version (May 2010)

  - by lexu

  In 2008 Artur Carvalho asked for an Alternative IDE for Silverlight and was told to look at Visual Studio Express. Is that still the valid answer in 2010 or are there other IDEs one should consider (cost/ OS it runs on / stability)? I'm trying to get a feel for silverlight development before commiting cash. So I don't need enterprize level tools or a license to distribute .. Would MonoDevelop and Moonlight be an option?

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• Using perl to split a line that may contain whitespace

  - by Tommy Fisk

  Okay, so I'm using perl to read in a file that contains some general configuration data. This data is organized into headers based on what they mean. An example follows: [vars] # This is how we define a variable! $var = 10; $str = "Hello thar!"; # This section contains flags which can be used to modify module behavior # All modules read this file and if they understand any of the flags, use them [flags] Verbose = true; # Notice the errant whitespace! [path] WinPath = default; # Keyword which loads the standard PATH as defined by the operating system. Append with additonal values. LinuxPath = default; Goal: Using the first line as an example "$var = 10;", I'd like to use the split function in perl to create an array that contains the characters "$var" and "10" as elements. Using another line as an example: Verbose = true; # Should become [Verbose, true] aka no whitespace is present This is needed because I will be outputting these values to a new file (which a different piece of C++ code will read) to instantiate dictionary objects. Just to give you a little taste of what it might look like (just making it up as I go along): define new dictionary name: [flags] # Start defining keys => values new key name: Verbose new value val: 10 # End dictionary Oh, and here is the code I currently have along with what it is doing (incorrectly): sub makeref($) { my @line = (split (/=/)); # Produces ["Verbose", " true"]; }

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• How may I create an horizontal view from a tree table

  - by Giuseppe Alfieri

  I want to create a view for each tree for each customer of this 3 table structured in this way: Fields: db_attrib.name, db_attrib.name, db_attrib.name until the last db_tree.id_child = 0 Values: db_attrib_values.value where db_attrib.id = db_attrib_value.id_attrib and so on for each child And so on for each db_tree.id This is the link to sql fiddle with the prepared structure: http://sqlfiddle.com/#!9/21516

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• Ruby: How to loop through an object that may or may not be an array?

  - by Shpigford

  I have an each method that is run on some user-submitted data. Sometimes it will be an array, other times it won't be. Example submission: <numbers> <number>12345</number> </numbers> Another example: <numbers> <number>12345</number> <number>09876</number> </numbers> I have been trying to do an each do on that, but when there is only one number I get a TypeError (Symbol as array index) error.

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