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• error prepareForSegue between a viewController and a tableViewController

  - by beta

  -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([segue.identifier isEqualToString:@"My_TableView"]) { MyTableViewController *destViewController = segue.destinationViewController; destViewController.data = data; } } Hi, I have a problem doing a segue (modal) between a ViewController to a TableViewController. The name of the segue between the ViewController and the NavigationController is "My_TableView". Compiler gives me this error: unrecognized selector sent to instance 0x9275b50 what's the problem?

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• Is it possible to force the use of "using" for disposable classes?

  - by Zanoni

  I need to force the use of "using" to dispose a new instance of a class. public class MyClass : IDisposable { ... } using(MyClass obj = new MyClass()) // Force to use "using" { }

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• How to use Rails2 when Rails3 is installed

  - by Earlz

  Hello I have both Rails2 and Rails3(beta 3) installed by Ruby Gems. Everything right now defaults to using Rails3. For instance rails myproject will create a new Rails3 template. How do I override this so everything goes to Rails2?

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• Class name to view path

  - by Alexey Poimtsev

  Hi, I have a RoR application and model SomeModel. I have views for this model and I want to know - is there any method to get the view's path? Of course I can use for this model instance m = SomeModel.new v = m.class.class_name.pluralize.downcase It's working, but maybe you know a better way? :)

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• How to check if a BOOL is null?

  - by Sheehan Alam

  Is there a way I can check to see if a value is NULL/Nil before assigning it to a BOOL? For example, I have a value in a NSDictionary that can be either TRUE/FALSE/NULL mySTUser.current_user_following = [[results objectForKey:@"current_user_following"]boolValue]; When the value is NULL I get the following error *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSNull boolValue]: unrecognized selector sent to instance I would like to be able to handle the NULL case.

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• Django: Template should render 'description' not actual value

  - by Till Backhaus

  Hi, in a Model I have a CharField with choices: class MyModel(models.Model): THE_CHOICES=( ('val',_(u'Value Description')), ) ... myfield=models.CharField(max_length=3,choices=THE_CHOICES Now in the template I access an instance of MyModel: {{ my_instance.myfield }} Of course the gives me val instead of Value Description. How do I get the description? Thanks in advance!

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• Understanding java's native threads and the jvm

  - by Moev4

  I understand that the jvm is itself an application that turns the bytecode of the java executable into native machine code, but when using native threads I have some questions that I just cannot seem to answer. Does every thread create their own instance of the jvm to handle their particular execution? If not then does the jvm have to have some way to schedule which thread it will handle next, if so wouldn't this render the multi-threaded nature of java useless since only one thread can be ran at a time?

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• PHP ORM's, multiple tables and efficiency

  - by sunwukung

  Let's say I have a data mapper function that aggregates multiple tables and generates an object instance from that data. The mapper has a typical save() method which delegates to update/insert. When the mapper executes save - ideally it isolates object fields that have been modified, thus preventing the code from blanket bombing the database. How would you go about this?

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• What is the difference between Const and Static in C# ?

  - by Praveen

  Hi All, I am eager to know the difference between ac onst variable and a static variable. As far as I know a const is also static and can not be accessed on instance variable that's same like static , then what is the difference between them ? Please explain ...

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• What one unknown/uncommon knowledge greatly helps you in _____ language?

  - by Kerry

  I seem to keep running into little tidbits that help drastically in different areas of different languages. For instance, a few days ago I learned about EXPLAIN SELECT... for any MySQL query that seems to be going slow. It took my 196 second query to 0.0084 seconds.

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• Where to announce a project aimed exclusively at developers?

  - by doublep

  Where do I announce a free software project that is aimed exclusively at developers? If it was an end-user application, I could try freshmeant.net, for instance. But how to make a developer-only low-level library "known to the world"? [not sure this is not off-topic here...]

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• Force update in Hibernate

  - by gubrutz

  How can I force Hibernate to update an entity instance even if the entity is not dirty? I'm using Hibernate 3.3.2 GA, Hibernate Annotations and Hibernate EntityManager btw. I really want Hibernate to execute the generic UPDATE statement even if no property on the entity has changed. I need this because some event listeners need to get invoked to do some additional work when the application runs for the first time. Thanks!

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• Get color output in bash

  - by Werner

  Hi, when compiling some projects on linux terminal, I get usually a long output consisting of a lot of information. Usually this information is MONOCHROME. I wonder if bash can be modified somehow, so in all outputs or in some specific outputs (like from Makefile, etc) I can get different colors dependeing on, for instance: make[1]: Leaving directory or g++ -DHAVE_CONFIG_H -I. etc. Thanks

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• Retrieve Value from NSString

  - by Taimur Hamza

  Hi, i have a NSString instance ,i want to retrieve value from it and store it into an integer. This is wat i am doing but its not working. NSString *totalcnt; char *str = totalcnt; int a = atoi(str); Help me out. Thanks Taimur

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• How do I programmatically disable the update checks for an Ehcache?

  - by Gosta

  I know that the attribute "updateCheck" can be set in "false" in the XMLlike this: xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../config/ehcache.xsd" updateCheck="false" monitoring="autodetect" But I need to do this programmatically. How should I do it?

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• Using a model to represent the overall state of a view

  - by James P.

  Is there a standard practise for representing the state of a user interface that is not linked to a single Component? For example, a Swing interface could have a series of tabs with a constraint that a single tab should only be displayed once per a given entity type (this could be represented as a HashSet). Or a message could give the result of the last operation carried out. Or a JPanel could be linked to a single entity instance for editing purposes.

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• How does one access this hash from an ActiveRecord class in the Rails console?

  - by randombits

  I have a simple hash I created to make it easier to do dictionary type lookups. For instance: class Numbers < ActiveRecord::Base MY_TYPES { one: => 1, two: => 2 } end Is it not possible in the rails console to access this hash via Numbers.MY_TYPES[:one]?

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• empty sharepoint user profile property throw an exception

  - by James123

  I have a user profile property. user not assigned any value that property. If I use below code. It is thorwing exception " object reference not set to an instance of an object " userprof["OptOut"].ToString() I tried all types like if (userprof["OptOut"] != null) OR if(userprof["OptOut"].Value != null) nothing worked out for me. Here userProf object has value. userprof["OptOut"].Value is null How to handle this?

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• Linq DBML multiple sql servers

  - by Hurricanepkt

  I have an archive system that had to be on two sql databases for simplicity one is Archive2009 and the other Archive2010 they are both on the same sql server and instance and have identical structures however I have a page that needs to view the old one and the new one (I can make two seperate pages) How best would I go about doing this? Dynamically changing the connection string etc?

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• Question with "extern" in C

  - by why

  When programming, I would like to split one large file(which contains main function) to many small files, so there is one common case: functions in small files can modify the var from main file, so i think extern is very useful! for instance: in main.c extern int i = 100; in small.c extern int i; fprintf(stdout, "var from main file: %d\n", i); I just want to know is my understanding right?

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• Efficient way to build a MySQL update query in Python

  - by ensnare

  I have a class variable called attributes which lists the instance variables I want to update in a database: attributes = ['id', 'first_name', 'last_name', 'name', 'name_url', 'email', 'password', 'password_salt', 'picture_id'] Each of the class attributes are updated upon instantiation. I would like to loop through each of the attributes and build a MySQL update query in the form of: UPDATE members SET id = self._id, first_name = self._first name ... Thanks.

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• How to reference a class that implements certain interface?

  - by vikp

  Hi, I have an interface for logging the exceptions, i.e. IExceptionLogger. This interface has 3 implementations: DBExceptionLogger, XMLExceptionLogger, CSVExceptionLogger. I have an application that will make a use of DBExceptionLogger. The application references only IExceptionLogger. How do I create an instance of DBExceptionLogger within the application. I can't reference the DBExceptionLogger directly since it will break the purpose of having IExceptionLogger interface. Thanks

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• How do I use the additional Silverlight Toolkit controls?

  - by Brett Rigby

  I've got VS2010 installed, I've downloaded the Windows Phone add-in and the Silverlight Toolkit from CodePlex, but I cannot work out for the life of me how to actually use the controls in a Windows Phone 7 application... How do I add the controls into the toolbox, or link them so that the XAML doesn't give me errors all the time? For instance, using the Viewbox - the controls aren't implemented, and the XAML does not compile.

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• How can the AssemblyName class be used for existing Assemblies?

  - by IbrarMumtaz

  This is another exam related question. I want to know how can I use the AssemblyName class to represent an existing assembly that already exists on disk??? I am talking about from the perspective of using the AppDomain's instance method .Load(), that takes an AssemblyName object as a parameter. I know what MSDN has to say about what the .Load() method was designed for but that aside, I still want to know how to use it !!!

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• log4net - getting appenders specific to only one logger

  - by andreav

  I'm looking for a way to get all appenders attached to one logger instance. I tried: Hierarchy hierarchy = LogManager.GetRepository() as Hierarchy; hierarchy.GetAppenders() as per documentation this returns all appenders for all loggers currently configured. When I try this: LogManager.GetLogger("MyLoggerName").Logger.Repository.GetAppenders(); I get the same result. I would like to retrieve only appenders attached to one logger ("MyLoggerName" in this case) Were am i wrong? Thank you.

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