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  • Core Data deleteObject: sets attributes to nil

    - by SG1
    I am implementing an undo/redo mechanism in my app. This works fine for lots of cases. However, I can't undo past deleteObject:. the object is correctly saved in the undo queue, and I get it back and reinsterted into the Core Data stack just fine when calling undo. The problem is that all it's attributes are getting set to nil when I delete it. I have an entity "Canvas" with a to-many relationship called "graphics" to a "Graphic" entity, which has its inverse set to "canvas". Deleting a Graphic, then inserting it back, doesn't work. Here's the code (the redo method is basically the same): - (void)deleteGraphic:(id)aGraphic { //NSLog(@"undo drawing"); //Prepare the undo/redo [self.undoManager beginUndoGrouping]; [self.undoManager setActionName:@"Delete Graphic"]; [[self.detailItem valueForKey:@"graphics"] removeObject:aGraphic]; [[self managedObjectContext] deleteObject:aGraphic]; //End undo/redo [self.undoManager registerUndoWithTarget:self selector:@selector(insertGraphic:) object:aGraphic]; [self.undoManager endUndoGrouping]; NSLog(@"graphics are %@", [self sortedGraphics]); //Update drawing [self.quartzView setNeedsDisplay]; } and here's the wierdness: Before delete: graphics are ( <NSManagedObject: 0x1cc3f0> (entity: Graphic; id: 0x1c05f0 <x-coredata:///Graphic/t840FE8AD-F2E7-4214-822F-7994FF93D4754> ; data: { canvas = 0x162b70 <x-coredata://A919979E-75AD-474D-9561-E0E8F3388718/Canvas/p20>; content = <62706c69 73743030 d4010203 04050609 0a582476 65727369 6f6e5424 746f7059 24617263 68697665 7258246f 626a6563 7473>; frameRect = nil; label = nil; order = 1; path = "(...not nil..)"; traits = "(...not nil..)"; type = Path; }) After redo: graphics are ( <NSManagedObject: 0x1cc3f0> (entity: Graphic; id: 0x1c05f0 <x-coredata:///Graphic/t840FE8AD-F2E7-4214-822F-7994FF93D4754> ; data: { canvas = nil; content = nil; frameRect = nil; label = nil; order = 0; path = nil; traits = nil; type = nil; }), You can see it's the same object, just totally bleached by Core Data. The relationship delete rouls apparently have nothing to do with it as I've set them to "No Action" in a test.

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  • WPF DataGrid bind data between columns

    - by Markus2k
    Lets say I have 2 columns in my data Grid: Column A: Selected, and Column B: Name. The Selected column is a checkbox. And Name column is text field. I want to set the color of the text in 'Name' column as Blue if Column A's check box is checked, and Red otherwise. Essentially I don't know how to bind data between columns of the datagrid. And sample code/link providing example would be useful.

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  • Cocoa Core data filename?

    - by RW
    I followed Apple's example for creating a managed object which btw was great... http://developer.apple.com/cocoa/coredatatutorial/index.html However I now want to know what "name" (filename) the user saved his data as. Does anyone know how to pull the filename from the core data object. something like this would be great... NSLog (@"the filename is %@", [coreData filename]); Any ideas?

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  • reset the data in the table of data set in c#.net

    - by shruti
    im populating the data in the combo box using dataset tables...with some table name..now i want to clear those entries or data populated in the combobox every time when the button is clicked...so that new entries can be done.... is there any way to clear the comobo box values??

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  • ASP.NET Dynamic Data Browser Compatibility

    - by Petras
    Could any experienced users of Dynamic Data comment on whether there are issues with it in: Internet Explorer 6 Safari Chrome Opera We are looking to use it on a public facing website and good old IE6 has many important users in government departments and large companies so it has to work there. The other browsers could also become an issue.

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  • iPhoneOS Core Data migration: moving something from an entity into a file

    - by Tim Sullivan
    I have a scenario where I'm moving the contents of a blob stored in a core data entity into a file. I need a way to export that data during a migration, where I know the entity that's being converted and save the blob to a file, writing the location of that file into the converted entity's appropriate attribute. I can't seem to find a way to do this. The docs regarding the Three Stage Migration seem to indicate what can be done, but I'm not sure where to define things, or what exactly to define.

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  • In Python, how can I find the index of the first item in a list that is NOT some value?

    - by Ryan B. Lynch
    Python's list type has an index(x) method. It takes a single parameter x, and returns the (integer) index of the first item in the list that has the value x. Basically, I need to invert the index(x) method. I need to get the index of the first value in a list that does NOT have the value x. I would probably be able to even just use a function that returns the index of the first item with a value != None. I can think of a 'for' loop implementation with an incrementing counter variable, but I feel like I'm missing something. Is there an existing method, or a one-line Python construction that can handle this? In my program, the situation comes up when I'm handling lists returned from complex regex matches. All but one item in each list have a value of None. If I just needed the matched string, I could use a list comprehension like '[x for x in [my_list] if x is not None]', but I need the index in order to figure out which capture group in my regex actually caused the match.

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  • Extract some data from a lot of xml files

    - by LifeH2O
    I have cricket player profiles saved in the form of .xml files in a folder. each file has these tags in it <playerid>547</playerid> <majorteam>England</majorteam> <playername>Don</playername> the playerid is same as in .xml (each file is of different size,1kb to 5kb). These are about 500 files. What i need is to extract the playername, majorteam, and playerid from all these files to a list. I will convert that list to XML later. If you know how can i do it directly to XML i will be very thankful.

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  • core data and paging

    - by Joo Park
    I have a database of 50,000 records. I'm using core data to fetch records from a search. A search could return 1000 records easily. What is needed to page through these records using core data and uitableview? I would like to show 100 records at a time and have 'load more' button after viewing 100 records.

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  • Using terminal to record/save a data stream

    - by jonhurlock
    I want to be able to save a data stream which i am returning using the curl command. I have tried using the cat command, and piping it the curl command, however i'm doing it wrong. The code im currently using is: cat > file.txt | curl http://datastream.com/data Any help would be appreciated.

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  • web service for business logic or data access layer

    - by luiscarlosch
    This post http://www.theserverside.net/tt/articles/showarticle.tss?id=Top5WSMistakes encourages me to create the web service for business logic layer but many people use it in the data access layer. I want to create a project where i want to access the same data repository from a desktop application, website and a cell phone. What would you recommend me? Is there any case it may be a good idea implement web services to both layers? thanks.

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  • How can I move my Dynamic Data folder?

    - by ProfK
    I accidentally moved my Dynamic Data' folder into myImagesfolder. The project still compiles, but it's just not right. However, when I try to move it back to the root in Visual Studio, I get an error that the destination folder already exists. If I moveDynamic Data` back to the root outside of Visual Studio, the project no longer compiles because the compiler can't find any dynamic data files. My infancy with git prompted me to ask here before embarking on an unpleasant 2am quest.

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  • Effecient data structure design

    - by Sway
    Hi there, I need to match a series of user inputed words against a large dictionary of words (to ensure the entered value exists). So if the user entered: "orange" it should match an entry "orange' in the dictionary. Now the catch is that the user can also enter a wildcard or series of wildcard characters like say "or__ge" which would also match "orange" The key requirements are: * this should be as fast as possible. * use the smallest amount of memory to achieve it. If the size of the word list was small I could use a string containing all the words and use regular expressions. however given that the word list could contain potentially hundreds of thousands of enteries I'm assuming this wouldn't work. So is some sort of 'tree' be the way to go for this...? Any thoughts or suggestions on this would be totally appreciated! Thanks in advance, Matt

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  • Define "cyclic data structures"

    - by Earlz
    At the JSON site it says JSON does not support cyclic data structures, so be careful to not give cyclical structures to the JSON stringifier. What does it mean by this? Can someone give me an example of such a data structure in Javascript?

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  • Unable to Export contents of Data table (with French formatted Numbers ) to XML

    - by Ananth
    I have a data Table with numbers formatted according to the current regional settings. ie ( in French decimal separators are ',' instead of '.' in English). I need to export it to XML. Numbers in XML needs to be formatted according to the current regional settings.But now numbers in XML are formatted in English.Is there any way to make the number formatting in XML according to current regional settings ( or based on the locale of the Data Table) during the exporting process ?

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  • Saving private data

    - by rajatgoel
    Hi, Can anybody detail some approach on how to save private data in social websites like facebook, etc. They cant save all the updates and friends list in clear text format because of privacy issues. So how do they actually save it? Hashing all the data with user password so that only a valid session view it is one possibility. But I think there are some problem with this approach and there must be some better solution.

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