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  • Jquery Autocomplete plugin with Django (Trey Piepmeier solution)

    - by Sally
    So, I'm basing my code on Trey's solution on: http://solutions.treypiepmeier.com/2009/12/10/using-jquery-autocomplete-with-django/ The script is: <script> $(function() { $('#id_members').autocomplete('{{ object.get_absolute_url }}members/lookup', { dataType: 'json', width: 200, parse: function(data) { return $.map(data, function(row) { return { data:row, value:row[1], result:row[0] }; }); } }).result( function(e, data, value) { $("#id_members_pk").val(value); } ); } ); </script> The views.py: def members_lookup(request, pid): results = [] if request.method == "GET": if request.GET.has_key(u'q'): value = request.GET[u'q'] # Ignore queries shorter than length 1 if len(value) > 2: model_results = Member.objects.filter( Q(user__first_name__icontains=value) | Q(user__last_name__icontains=value) ) results = [ (x.user.get_full_name(), x.id) for x in model_results ] json = simplejson.dumps(results) print json return HttpResponse(json, mimetype='application/json') The problem is: It stops refining the search results after the initial lookup. For example: If I set len(value) 2, after I type the 3rd character it will give me a list of suggestions. But if I keep on typing the 4th or 5th character, the list of suggestions doesn't change. Any suggestions on why this is?

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  • WPF Spellcheck Engine takes up too much memory.

    - by Matt H.
    Each datatemplate in my WPF ItemsControl contains FIVE custom bindable richtextbox controls. It is a data-driven app that for authoring multiple-choice questions -- The question and four answer choices must all support: 1) Spell check 2) Rich formatting (otherwise I'd use regular textboxes) The spell check object in .NET 4 has a Friend constructor that takes a single argument of owner As TextBoxBase This means every richtextbox in the ItemsControl has 5 Spellcheck objects! This is the problem -- every spell check engine is consuming about 500k memory. So after you favor in the spellcheck, bindings, additional controls in the DataTemplate, etc.. a single multi choice question consumes more than 3MB memory. Users with 100--200 questions will quickly see the App raise it's memory consumption to 500+ MB. Management is definitely not OK with this. Is there a way to minimimze this problem? The best suggestion I've heard is to enable/disable spellcheck if the richtextbox is in the ItemsControl's scrollviewer: I haven't gotten an answer to how to go about it: (http://stackoverflow.com/questions/2869012/possible-to-implement-an-isviewportvisible-dependencyproperty-for-an-item-in-an-i) Any good ideas?

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  • Extracting [] elements from form collection - mvc - should use icollection but have mix of types

    - by bergin
    hi there. have looked at Phil Haacks project on books at http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx which has been useful, but I have a mix of data types. I use a modelview so that i can have a mix of objects, in this case: Order (ie order.id, order.date etc), Customer, SoilSamplingOrder and a list of SoilSamplingSubJobs which is like this [0].id, [0].field, [1].id, [1].field etc Perhaps I should be using ICollection instead of List? I had problems getting UpdateModel to work so I used an extract from collection method. the first 4 method calls : orderRepository.FindOrder(id); etc give the model the original to be edited. but after this point i'm a little lost in how to update the subjobs. I hope i have delineated enough to make sense of the problem. [HttpPost] public ActionResult Edit(int id, FormCollection collection) { Order order = orderRepository.FindOrder(id); Customer cust = orderRepository.FindCustomer(order.customer_id); IList<SoilSamplingSubJob> sssj = orderRepository.FindSubOrders(id); SoilSamplingOrder sso = orderRepository.FindSoilSampleOrder(id); try { UpdateModel(order, collection.ToValueProvider()); UpdateModel(cust, collection.ToValueProvider()); UpdateModel(sso, collection.ToValueProvider()); IList<SoilSamplingSubJob> sssjs = orderRepository.extractSSSJ(collection); foreach (var sj in sssjs) UpdateModel(sso, collection.ToValueProvider()); orderRepository.Save(); return RedirectToAction("Details", new { id=order.order_id}); } catch { return View(); } }

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  • When can a == b be false and a.Equals(b) true?

    - by alastairs
    I ran into this situation today. I have an object which I'm testing for equality; the Create() method returns a subclass implementation of MyObject. MyObject a = MyObject.Create(); MyObject b = MyObject.Create(); a == b; // is false a.Equals(b); // is true Note I have also over-ridden Equals() in the subclass implementation, which does a very basic check to see whether or not the passed-in object is null and is of the subclass's type. If both those conditions are met, the objects are deemed to be equal. The other slightly odd thing is that my unit test suite does some tests similar to Assert.AreEqual(MyObject.Create(), MyObject.Create()); // Green bar and the expected result is observed. Therefore I guess that NUnit uses a.Equals(b) under the covers, rather than a == b as I had assumed. Side note: I program in a mixture of .NET and Java, so I might be mixing up my expectations/assumptions here. I thought, however, that a == b worked more consistently in .NET than it did in Java where you often have to use equals() to test equality.

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  • NSPredicate case-insensitive matching on to-many relationship

    - by Brian Webster
    I am implementing a search field where the user can type in a string to filter the items displayed in a view. Each object being displayed has a keywords to-many relationship, and I would like to be able to filter the objects based on their keywords. Each keyword object has a name property, so I've set up an NSPredicate to do the filtering that looks like this: NSPredicate* predicate = [NSPredicate predicateWithFormat:@"keywords.name CONTAINS %@", self.searchString]; This works, but the problem is that the search is case-sensitive, so if the keyword has a capital letter but the user types in all lowercase, no matches are found. I've tried the following modification: NSPredicate* predicate = [NSPredicate predicateWithFormat:@"keywords.name CONTAINS[c] %@", self.searchString]; But that doesn't make any difference in the case sensitivity of the matching. Is there a way to do this case-insensitive matching using just a plain predicate? Or will I need to implement some sort of custom accessor on the keyword class, e.g. write a lowercaseName method and match against a lowercased version of the search string instead? Addendum: After further exploration, the workaround of adding a custom accessor works OK for manual use of NSPredicate, but does not work at all when using NSFetchRequest with Core Data, which only works when querying attributes defined in the Core Data model.

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  • Accessing an iFrame's dom from a Firefox Extension

    - by luisgo
    Hi all, I've spent a long time trying different things to get this to work but nothing does and documentation is not helping much. I'm trying to populate a form inside an iframe that I dynamically inject into a page. To inject that iframe I do: myObject.iframe = document.createElement("iframe"); myObject.iframe.setAttribute("src", data.url); myObject.iframe.setAttribute("id","extension-iframe"); myObject.window.document.getElementById('publisher').appendChild(myObject.iframe); myObject.iframe.addEventListener("load", function(){ myObject.populate(data); }, false); which works fine and DOES trigger the populate() method. My problem is getting the document or window objects for that iframe. I've tried all of the following: myObject.iframe.window myObject.iframe.document myObject.iframe.content but these are all undefined. I also tried passing the event object to that iframe's load event listener and then doing: event.originalTarget But that didn't work either. I am reading the following documentation: https://developer.mozilla.org/En/Working%5Fwith%5Fwindows%5Fin%5Fchrome%5Fcode https://developer.mozilla.org/en/Code%5Fsnippets/Interaction%5Fbetween%5Fprivileged%5Fand%5Fnon-privileged%5Fpages But either I'm not understanding it or it's just not properly explained. Can anyone shed some light? Thanks!

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  • Pitfalls and practical Use-Cases: Toplink, Hibernate, Eclipse Link, Ibatis ...

    - by Martin K.
    I worked a lot with Hibernate as my JPA implementation. In most cases it works fine! But I have also seen a lot of pitfalls: Remoting with persisted Objects is difficult, because Hibernate replaces the Java collections with its own collection implementation. So the every client must have the Hibernate .jar libraries. You have to take care on LazyLoading exceptions etc. One way to get around this problem is the use of webservices. Dirty checking is done against the Database without any lock. "Delayed SQL", causes that the data access isn't ACID compliant. (Lost data...) Implict Updates So we don't know if an object is modified or not (commit causes updates). Are there similar issues with Toplink, Eclipse Link and Ibatis? When should I use them? Have they a similar performance? Are there reasons to choose Eclipse Link/Toplink... over Hibernate?

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  • Conditions with common logic: question of style, readability, efficiency, ...

    - by cdonner
    I have conditional logic that requires pre-processing that is common to each of the conditions (instantiating objects, database lookups etc). I can think of 3 possible ways to do this, but each has a flaw: Option 1 if A prepare processing do A logic else if B prepare processing do B logic else if C prepare processing do C logic // else do nothing end The flaw with option 1 is that the expensive code is redundant. Option 2 prepare processing // not necessary unless A, B, or C if A do A logic else if B do B logic else if C do C logic // else do nothing end The flaw with option 2 is that the expensive code runs even when neither A, B or C is true Option 3 if (A, B, or C) prepare processing end if A do A logic else if B do B logic else if C do C logic end The flaw with option 3 is that the conditions for A, B, C are being evaluated twice. The evaluation is also costly. Now that I think about it, there is a variant of option 3 that I call option 4: Option 4 if (A, B, or C) prepare processing if A set D else if B set E else if C set F end end if D do A logic else if E do B logic else if F do C logic end While this does address the costly evaluations of A, B, and C, it makes the whole thing more ugly and I don't like it. How would you rank the options, and are there any others that I am not seeing?

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  • Sorting by dates (including nil) with NSFetchedResultsController

    - by glorifiedHacker
    In my NSFetchedResultsController, I set a sortDescriptor that sorts based on the date property of my managed objects. The problem that I have encountered (along with several others according to Google) is that nil values are sorted at the earliest end rather than the latest end of the date spectrum. I want my list to be sorted earliest, earlier, now, later, latest, nil. As I understand it, this sorting is done at the database level in SQLite and so I cannot construct my own compare: method to provide the sorting I want. I don't want to manually sort in memory, because I would have to give up all of the benefits of NSFetchedResultsController. I can't do compound sorting because the sectionNameKeyPaths are tightly coupled to the date ranges. I could write a routine that redirects indexPath requests so that section 0 in the results controller gets mapped to the last section of the tableView, but I fear that would add a lot of overhead, severely increase the complexity of my code, and be very, very error-prone. The latest idea that I am considering is to map all nil dates to the furthest future date that NSDate supports. My left brain hates this idea, as it feels more like a hack. It will also take a bit of work to implement, since checking for nil factors heavily into how I process dates in my app. I don't want to go this route without first checking for better options. Can anyone think of a better way to get around this problem?

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  • Dynamically add User Controls to a Silverlight 4 page

    - by PilotBob
    I am building an iGoogle like "dashboard" for our application with silverlight 4. Each users dashboard (which snapins and their positions) will be stored in the database. Each snap in is a user control, for example... AwesomeSnapin.xaml. On the dashboard page in silverlight I am retrieving the users dashboard which is a collection of snapin objects which include the information on the snapin. I can store the name of the page or the class or whatever is needed. I have the following code which loops through the collection of snapins to add them to the dashboard page. In testing I have just hard coded a single snapin item. Here is the prototype code: foreach (var UserSnapin in op.Entities) { UserControl uc = new AmsiSL.eFinancials.BudgetCheck(); Canvas.SetLeft(uc, UserSnapin.PositionLeft); Canvas.SetTop(uc, UserSnapin.PositionTop); Layout.Children.Add(uc); MessageBox.Show(String.Format("Added {0}",UserSnapin.Snapin.Name)); } The above works fine... but of course adds the BudgetCheck snapin for every item that is defined for the users dashboard. Of course the messagebox is for debugging purposes only. How would I change line 3 of that to load the user control class (using classname or xaml path whichever is better) based on the data in the collection.

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  • Accessing class member variables inside a BackgroundWorker's DoWork event handler, and other Backgro

    - by Justin
    Question 1 In the DoWork event handler of a BackgroundWorker, is it safe to access (for both reading and writing) member variables of the class that contains the BackgroundWorker? Is it safe to access other variables that are not declared inside the DoWork event handler itself? Obviously DoWork should not be accessing any UI objects of, say, a WinForms application, as the UI should only be updated from the UI thread. But what about accessing other (not UI-related) member variables? The reason why I ask is that I've seen the occasional comment come up while Googling saying that accessing member variables is not allowed. The only example I can find at the moment is a comment on this MSDN page, which says: Note, that the BGW can cause exceptions if it attempts to access or modify class level variables. All data must be passed to it by delegates and events. And also: NEVER. NEVER. Never try to reference variables not declared inside of DoWork. It may seem to work at times, but in reality you are just getting lucky. As far as I know, MSDN itself does not document any restrictions of this kind (although if I'm wrong, I'd appreciate a link). But comments like these do seem to pop up every now and again. (Of course if DoWork does access/modify a member variable that could be accessed/modified by the main thread at the same time, it is necessary to synchronise access to that field, eg by using a locking object. But the above quotes seem to require a blanket ban of accessing member variables, rather than just synchronising access!) Question 2 To make this into a more general question, are there any other (not documented?) restrictions that users of the BackgroundWorker should be aware of, aside from the above? Any "best practices", perhaps?

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  • WinForms GDI+ Polygon Events and custom shaped panels

    - by JD
    I have converted postcode boundary polygons to point data (point[] for each polygon) from GIS Shape Files. I am wanting to show this in a c# windows forms application. I have managed to show this using the System.Drawing (GDI+) DrawPolygon() method. Graphics g = this.CreateGraphics(); Pen pen = new Pen(Color.Black); Brush brush = new SolidBrush(Color.FromArgb(255,255,o)); PointF[] ptr = { point data here }; g.FillPolygon(brush, ptr); g.DrawPolygon(pen, ptr); Is it possible to add events to a drawn polygon? If so how do I do this for individual polygons. For example, click on a postcode polygon and a messagebox shows information about the postcode. Secondly, would it be easier to make a custom control inheriting the winforms panel. Is there a way to shape the border of a winforms panel control using a set of points? Postcode objects are serialised and stored in the filesystem.

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  • Partial template specialization on a class

    - by Jonathan Swinney
    I'm looking for a better way to this. I have a chunk of code that needs to handle several different objects that contain different types. The structure that I have looks like this: class Base { // some generic methods } template <typename T> class TypedBase : public Base { // common code with template specialization private: std::map<int,T> mapContainingSomeDataOfTypeT; } template <> class TypedBase<std::string> : public Base { // common code with template specialization public: void set( std::string ); // functions not needed for other types std::string get(); private: std::map<int,std::string> mapContainingSomeDataOfTypeT; // some data not needed for other types } Now I need to add some additional functionality that only applies to one of the derivative classes. Specifically the std::string derivation, but the type doesn't actually matter. The class is big enough that I would prefer not copy the whole thing simply to specialize a small part of it. I need to add a couple of functions (and accessor and modifier) and modify the body of several of the other functions. Is there a better way to accomplish this?

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  • Formatted text encoding in binary plist

    - by Sean
    I'm trying to do some scripting that edits a binary plist file. The plist describes the objects contained in a DVD studio pro file. It appears that a text box in DVD studio pro is encoded in the plist as hex data that describes the text string along with its formatting. I can't seem to figure out how to understand this data. Ideally, I'd like to be able to alter the text string but not the formatting. The following seems to describe a text box that says "Menu title here". There are two hex strings, one with the key called "dictionary" and the other called "string"; both are CFData. Any ideas how I can parse this or convert this into a format that I can edit directly? I've been playing around with writing a little converter in cocoa, but no luck yet. <dict> <key>Dictionary</key> <data> BAtzdHJlYW10 eXBlZIHoA4QB QISEhAxOU0Rp Y3Rpb25hcnkA hIQITlNPYmpl Y3QAhYQBaQaS hISECE5TU3Ry aW5nAZSEASsG TlNGb250hpKE hIQGTlNGb250 HpSVJIQFWzM2 Y10GAAAAGgAA AP/+TAB1AGMA aQBkAGEARwBy AGEAbgBkAGUA AACEAWYVhAFj AJsBmwCbAIaS hJaXB05TQ29s b3KGkoSEhAdO U0NvbG9yAJSb AYQEZmZmZoPz 8nI/g/Dvbz+D 7OtrPwGGkoSW lwtOU0V4cGFu c2lvboaShISE CE5TTnVtYmVy AISEB05TVmFs dWUAlIQBKoSa moNHx9c9hpKE lpcNTlNPYmxp cXVlbmVzc4aS hJ6ghIQBZKEA hpKElpcQTlNQ YXJhZ3JhcGhT dHlsZYaShISE EE5TUGFyYWdy YXBoU3R5bGUA lIQEQ0NAUwAA hQCGkoSWlxFO U0JhY2tncm91 bmRDb2xvcoaS hJubA4QCZmYA AIaG </data> <key>String</key> <data> BAtzdHJlYW10 eXBlZIHoA4QB QISEhBJOU0F0 dHJpYnV0ZWRT dHJpbmcAhIQI TlNPYmplY3QA hZKEhIQITlNT dHJpbmcBlIQB Kw9OZW51IFRp dGxlIEhlcmWG hAJpSQEPkoSE hAxOU0RpY3Rp b25hcnkAlIQB aQWShJaWDU5T T2JsaXF1ZW5l c3OGkoSEhAhO U051bWJlcgCE hAdOU1ZhbHVl AJSEASqEhAFk nQCGkoSWlgtO U0V4cGFuc2lv boaShJuchIQB Zp6DR8fXPYaS hJaWEE5TUGFy YWdyYXBoU3R5 bGWGkoSEhBBO U1BhcmFncmFw aFN0eWxlAJSE BENDQFMAAIUA hpKElpYGTlNG b250hpKEhIQG TlNGb250HpSZ JIQFWzM2Y10G AAAAGgAAAP/+ TAB1AGMAaQBk AGEARwByAGEA bgBkAGUAAACe FYQBYwCjAaMA owCGkoSWlgdO U0NvbG9yhpKE hIQHTlNDb2xv cgCUowGEBGZm ZmaD8/JyP4Pw 728/g+zraz8B hoaG </data> </dict>

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  • What specific features of LabView are frustrating to you?

    - by Underflow
    Please bear with me: this isn't a language debate or a flame. It's a real request for opinions. Occasionally, I have to help educate a traditional text coder in how to think in LabVIEW (LV). Often during this process, I get to hear about how LV sucks. Rarely is this insight accompanied by rational observations other than "Language X is just so much better!". While this statement is satisfying to them, it doesn't help me understand what is frustrating them. So, for those of you with LabVIEW and text language experience, what specific things about LV drive you nuts? ------ Summaries ------- Thanks for all the answers! Some of the issues are answered in the comments below, some exist on other sites, and some are just genuine problems with LV. In the spirit of the original question, I'm not going to try to answer all of these here: check LAVA or NI's website, and you'll be pleasantly surprised at how many of these things can be overcome. Unintentional concurrency No access to tradition text manipulation tools Binary-only source code control Difficult to branch and merge Too many open windows Text has cleaner/clearer/more expressive syntax Clean coding requires a lot of time and manipulation Large, difficult to access API/palette system Mouse required File namespacing: no duplicate files with the same name in memory LV objects are natively by-value only Requires dev environment to view code Lack of zoom Slow startup Memory pig "Giant" code is difficult to work with UI lockup is easy to do Trackpads and LV don't mix well String manipulation is graphically bloated Limited UI customization "Hidden" primitives (yes, these exist) Lack of official metaprogramming capability (not for much longer, though) Lack of unicode support [1]: http://www.lavag.org LAVA

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  • how to access a type defined in one .ml file in another .ml file

    - by user339261
    Hi, I m very new to ocaml and i m facing the problem below, In a.ml a record type t is defined and is also defined transparently in a.mli, i.e. in d interface so that the type definition is available to all other files. a.ml also has a function, func, which returns a list of t. Now in another file, b.ml i m calling func, now obviously ocaml compiler wud nt be able to infer d type of objects stored in d list, for compiler its just a list. so in b.ml, i hav something like dis, let tlist = A.func in let vart = List.hd tlist in printf "%s\n" vart.name (name is a field in record t) Now here i get a compiler error sayin "Unbound record field label name" which makes sense as compiler can't infer d type of vart. my first question: how do I explicitly provide d type of vart as t here? i tried doing "let vart:A.t = " but got the same error. I also tried creating another function to fetch the first element of d list and mentioning return type as A.t, but then i got the "Unbound value A.t". I did this: let firstt = function [] - 0 | x :: _ - A.t x ;; The problem is compiler is unable to recognize A.t (a type) in b.ml but is able to recognize function A.func. If I remove A.t from the b.ml, i don'get any compiler errors. Please help, its urgent work. Thanks in advance! ~Tarun

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  • pass objective c object and primitive type into a void *

    - by user674669
    I want to pass 2 variables: UIImage * img int i into another method that only takes a (void *) I tried making a C struct containing both img and i struct MyStruct { UIImage *img; int i; } but xcode gives me an error saying "ARC forbids Objective-C objects in structs or unions" The next thing I tried is to write an objective-c class MyStruct2 containing img and i, alloc-initing an instance of it and typecasting it as (__bridge void*) before passing it to the method. Seems little involved for my use case. Seems like there should be a better way. What's the simplest way to achieve this? Thank you. Edit based on comments: I have to use void * as it is required by the UIView API. I created a selector as mentioned by UIVIew API + (void)setAnimationDidStopSelector:(SEL)selector Please see documentation for setAnimationDidStopSelector at http://developer.apple.com/library/ios/#documentation/uikit/reference/UIView_Class/UIView/UIView.html . It says ... The selector should be of the form: - (void)animationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context I want to pass both img and i into the (void *)context argument.

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  • Core Data Relationship problem

    - by awattar
    I have a very simple model with two objects: Name and Category. One Name can be in many Categories (it's one way relationship). I'm trying to create 8 Categories every with 8 Names. Example code: NSMutableArray *localArray = [NSMutableArray arrayWithObjects: [NSMutableDictionary dictionaryWithObjectsAndKeys: @"g1", @"Name", @"g1", @"Icon", [NSNumber numberWithBool:YES] , @"Male", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"g2", @"Name", @"g2", @"Icon", [NSNumber numberWithBool:YES] , @"Male", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"g3", @"Name", @"g3", @"Icon", [NSNumber numberWithBool:YES] , @"Male", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"g4", @"Name", @"g4", @"Icon", [NSNumber numberWithBool:YES] , @"Male", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"g5", @"Name", @"g5", @"Icon", [NSNumber numberWithBool:YES] , @"Male", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"g6", @"Name", @"g6", @"Icon", [NSNumber numberWithBool:YES] , @"Male", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"g7", @"Name", @"g7", @"Icon", [NSNumber numberWithBool:YES] , @"Male", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"g8", @"Name", @"g8", @"Icon", [NSNumber numberWithBool:YES] , @"Male", nil], nil]; NSMutableArray *localArray2 = [NSMutableArray arrayWithObjects: [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Test1", @"Name", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Test2", @"Name", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Test3", @"Name", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Test4", @"Name", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Test5", @"Name", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Test6", @"Name", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Test7", @"Name", nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Test8", @"Name", nil], nil]; NSError *error; NSManagedObjectContext *moc = [(AppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext]; for(NSMutableDictionary *item in localArray) { NSManagedObject *category = [NSEntityDescription insertNewObjectForEntityForName:@"Category" inManagedObjectContext:managedObjectContext]; [category setValue:[item objectForKey:@"Name"] forKey:@"Name"]; [category setValue:[item objectForKey:@"Icon"] forKey:@"Icon"]; [category setValue:[item objectForKey:@"Male"] forKey:@"Male"]; for(NSMutableDictionary *item2 in localArray2) { NSManagedObject *name = [NSEntityDescription insertNewObjectForEntityForName:@"Name" inManagedObjectContext:managedObjectContext]; [name setValue:[item2 objectForKey:@"Name"] forKey:@"Name"]; [[name mutableSetValueForKey:@"CategoryRelationship"] addObject:category]; } } [moc save:&error]; And here's a problem - i've checked that 8 Categories are saved, 64 Names are saved but only 8 from all Names are connected with any category. So when i query for Names in Categories [NSPredicate predicateWithFormat:@"CategoryRelationship.@count != 0"] there are 8 elements and when [NSPredicate predicateWithFormat:@"CategoryRelationship.@count = 0"] there are 56 elements. What is going one here?

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  • Fast JSON serialization (and comparison with Pickle) for cluster computing in Python?

    - by user248237
    I have a set of data points, each described by a dictionary. The processing of each data point is independent and I submit each one as a separate job to a cluster. Each data point has a unique name, and my cluster submission wrapper simply calls a script that takes a data point's name and a file describing all the data points. That script then accesses the data point from the file and performs the computation. Since each job has to load the set of all points only to retrieve the point to be run, I wanted to optimize this step by serializing the file describing the set of points into an easily retrievable format. I tried using JSONpickle, using the following method, to serialize a dictionary describing all the data points to file: def json_serialize(obj, filename, use_jsonpickle=True): f = open(filename, 'w') if use_jsonpickle: import jsonpickle json_obj = jsonpickle.encode(obj) f.write(json_obj) else: simplejson.dump(obj, f, indent=1) f.close() The dictionary contains very simple objects (lists, strings, floats, etc.) and has a total of 54,000 keys. The json file is ~20 Megabytes in size. It takes ~20 seconds to load this file into memory, which seems very slow to me. I switched to using pickle with the same exact object, and found that it generates a file that's about 7.8 megabytes in size, and can be loaded in ~1-2 seconds. This is a significant improvement, but it still seems like loading of a small object (less than 100,000 entries) should be faster. Aside from that, pickle is not human readable, which was the big advantage of JSON for me. Is there a way to use JSON to get similar or better speed ups? If not, do you have other ideas on structuring this? (Is the right solution to simply "slice" the file describing each event into a separate file and pass that on to the script that runs a data point in a cluster job? It seems like that could lead to a proliferation of files). thanks.

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  • PostgreSQL: BYTEA vs OID+Large Object?

    - by mlaverd
    I started an application with Hibernate 3.2 and PostgreSQL 8.4. I have some byte[] fields that were mapped as @Basic (= PG bytea) and others that got mapped as @Lob (=PG Large Object). Why the inconsistency? Because I was a Hibernate noob. Now, those fields are max 4 Kb (but average is 2-3 kb). The PostgreSQL documentation mentioned that the LOs are good when the fields are big, but I didn't see what 'big' meant. I have upgraded to PostgreSQL 9.0 with Hibernate 3.6 and I was stuck to change the annotation to @Type(type="org.hibernate.type.PrimitiveByteArrayBlobType"). This bug has brought forward a potential compatibility issue, and I eventually found out that Large Objects are a pain to deal with, compared to a normal field. So I am thinking of changing all of it to bytea. But I am concerned that bytea fields are encoded in Hex, so there is some overhead in encoding and decoding, and this would hurt the performance. Are there good benchmarks about the performance of both of these? Anybody has made the switch and saw a difference?

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  • How can I determine if an object or reference has a valid string coercion?

    - by Ether
    I've run into a situation (while logging various data changes) where I need to determine if a reference has a valid string coercion (e.g. can properly be printed into a log or stored in a database). There isn't anything in Scalar::Util to do this, so I have cobbled together something using other methods in that library: use strict; use warnings; use Scalar::Util qw(reftype refaddr); sub has_string_coercion { my $value = shift; my $as_string = "$value"; my $ref = ref $value; my $reftype = reftype $value; my $refaddr = sprintf "0x%x", refaddr $value; if ($ref eq $reftype) { # base-type references stringify as REF(0xADDR) return $as_string !~ /^${ref}\(${refaddr}\)$/; } else { # blessed objects stringify as REF=REFTYPE(0xADDR) return $as_string !~ /^${ref}=${reftype}\(${refaddr}\)$/; } } # Example: use DateTime; my $ref1 = DateTime->now; my $ref2 = \'foo'; print "DateTime has coercion: " . has_string_coercion($ref1) . "\n\n"; print "scalar ref has coercion: " . has_string_coercion($ref2) . "\n"; However, I suspect there might be a better way of determining this by inspecting the guts of the variable in some way. How can this be done better?

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  • CharField values disappearing after save (readonly field)

    - by jamida
    I'm implementing simple "grade book" application where the teacher would be able to update the grades w/o being allowed to change the students' names (at least not on the update grade page). To do this I'm using one of the read-only tricks, the simplest one. The problem is that after the SUBMIT the view is re-displayed with 'blank' values for the students. I'd like the students' names to re-appear. Below is the simplest example that exhibits this problem. (This is poor DB design, I know, I've extracted just the relevant parts of the code to showcase the problem. In the real example, student is in its own table but the problem still exists there.) models.py class Grade1(models.Model): student = models.CharField(max_length=50, unique=True) finalGrade = models.CharField(max_length=3) class Grade1OForm(ModelForm): student = forms.CharField(max_length=50, required=False) def __init__(self, *args, **kwargs): super(Grade1OForm,self).__init__(*args, **kwargs) instance = getattr(self, 'instance', None) if instance and instance.id: self.fields['student'].widget.attrs['readonly'] = True self.fields['student'].widget.attrs['disabled'] = 'disabled' def clean_student(self): instance = getattr(self,'instance',None) if instance: return instance.student else: return self.cleaned_data.get('student',None) class Meta: model=Grade1 views.py from django.forms.models import modelformset_factory def modifyAllGrades1(request): gradeFormSetFactory = modelformset_factory(Grade1, form=Grade1OForm, extra=0) studentQueryset = Grade1.objects.all() if request.method=='POST': myGradeFormSet = gradeFormSetFactory(request.POST, queryset=studentQueryset) if myGradeFormSet.is_valid(): myGradeFormSet.save() info = "successfully modified" else: myGradeFormSet = gradeFormSetFactory(queryset=studentQueryset) return render_to_response('grades/modifyAllGrades.html',locals()) template <p>{{ info }}</p> <form method="POST" action=""> <table> {{ myGradeFormSet.management_form }} {% for myform in myGradeFormSet.forms %} {# myform.as_table #} <tr> {% for field in myform %} <td> {{ field }} {{ field.errors }} </td> {% endfor %} </tr> {% endfor %} </table> <input type="submit" value="Submit"> </form>

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  • WPF ComboBox binding

    - by Budda
    Here is peace of the XAML code from my page: <ComboBox Grid.Row="2" Grid.Column="1" Name="Player2" MinWidth="50" ItemsSource="{Binding PlayersTest}" DisplayMemberPath="ShortName"> custom object is binded to the page data context: page.DataContext = new SquadViewModel(); Here is part the source code of 'SquadViewModel' class: public class SquadViewModel { public SquadViewModel() { PlayersTest = new ObservableCollection<SostavPlayerData>(); PlayersTest.Add(new SostavPlayerData { ShortName = "A. Sereda", }); PlayersTest.Add(new SostavPlayerData { ShortName = "D. Sereda", }); } public readonly ObservableCollection<SostavPlayerData> PlayersTest; public string TestText { get { return "Binding works perfectly!"; } } } As a result ComboBox should display a list of objects, but it is empty. Do you know why and how to get this list? Thank you. P.S. I've tried another XAML markup <ComboBox Grid.Row="1" Grid.Column="1" Name="Player1" MinWidth="50" ItemsSource="{Binding PlayersTest}"> <ComboBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding ShortName}"/> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox> It doesn't work also, but binding to simple text block: <TextBlock Grid.Row="2" Grid.Column="1" Text="{Binding TestText}"/> Works perfectly.

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  • Unity to dispose of object

    - by Johan Levin
    Is there a way to make Unit dispose property-injected objects as part of the Teardown? The background is that I am working on an application that uses ASP.NET MVC 2, Unity and WCF. We have written our own MVC controller factory that uses unity to instantiate the controller and WCF proxies are injected using the [Dependency] attribute on public properties of the controller. At the end of the page life cycle the ReleaseController method of the controller factory is called and we call IUnityContainer.Teardown(theMvcController). At that point the controller is disposed as expected but I also need to dispose the injected wcf-proxies. (Actually I need to call Close and/or Abort on them and not Dispose but that is a later problem.) I could of course override the controllers' Dispose methods and clean up the proxies there, but I don't want the controllers to have to know about the lifecycles of the injected interfaces or even that they refer to WCF proxies. If I need to write code myself for this - what would be the best extension point? I'd appreciate any pointer.

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  • Python minidom and UTF-8 encoded XML with hash references

    - by Jakob Simon-Gaarde
    Hi I am experiencing some difficulty in my home project where I need to parse a SOAP request. The SOAP is generated with gSOAP and involves string parameters with special characters like the danish letters "æøå". gSOAP builds SOAP requests with UTF-8 encoding by default, but instead of sending the special chatacters in raw format (ie. bytes C3A6 for the special character "æ") it sends what I think is called character hash references (ie. &#195;&#166;). I don't completely understand why gSOAP does it this way as I can see that it has marked the incomming payload as being UTF-8 encoded anyway (Content-Type: text/xml; charset=utf-8), but this is besides the question (I think). Anyway I guess gSOAP probably is obeying transport rules, or what? When I parse the request from gSOAP in python with xml.dom.minidom.parseString() I get element values as unicode objects which is fine, but the character hash references are not decoded as UTF-8 character codes. It unescapes the character hash references, but does not decode the string afterwards. In the end I have a unicode string object with UTF-8 encoding: So if the string "æble" is contained in the XML, it comes like this in the request: "&#195;&#166;ble" After parsing the XML the unicode string in the DOM Text Node's data member looks like this: u'\xc3\xa6ble' I would expect it to look like this: u'\xe6ble' What am I doing wrong? Should I unescape the SOAP XML before parsing it, or is it somewhere else I should be looking for the solution, maybe gSOAP? Thanks in advance. Best regards Jakob Simon-Gaarde

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