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  • PyDev and Django: PyDev breaking Django shell?

    - by Rosarch
    I've set up a new project, and populated it with simple models. (Essentially I'm following the tut.) When I run python manage.py shell on the command line, it works fine: >python manage.py shell Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. (InteractiveConsole) >>> from mysite.myapp.models import School >>> School.objects.all() [] Works great. Then, I try to do the same thing in Eclipse (using a Django project that is composed of the same files.) Right click on mysite project Django Shell with Django environment This is the output from the PyDev Console: >>> import sys; print('%s %s' % (sys.executable or sys.platform, sys.version)) C:\Python26\python.exe 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit (Intel)] >>> >>> from django.core import management;import mysite.settings as settings;management.setup_environ(settings) 'path\\to\\mysite' >>> from mysite.myapp.models import School >>> School.objects.all() Traceback (most recent call last): File "<console>", line 1, in <module> File "C:\Python26\lib\site-packages\django\db\models\query.py", line 68, in __repr__ data = list(self[:REPR_OUTPUT_SIZE + 1]) File "C:\Python26\lib\site-packages\django\db\models\query.py", line 83, in __len__ self._result_cache.extend(list(self._iter)) File "C:\Python26\lib\site-packages\django\db\models\query.py", line 238, in iterator for row in self.query.results_iter(): File "C:\Python26\lib\site-packages\django\db\models\sql\query.py", line 287, in results_iter for rows in self.execute_sql(MULTI): File "C:\Python26\lib\site-packages\django\db\models\sql\query.py", line 2368, in execute_sql cursor = self.connection.cursor() File "C:\Python26\lib\site-packages\django\db\backends\__init__.py", line 81, in cursor cursor = self._cursor() File "C:\Python26\lib\site-packages\django\db\backends\sqlite3\base.py", line 170, in _cursor self.connection = Database.connect(**kwargs) OperationalError: unable to open database file What am I doing wrong here?

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  • Ruby on Rails: How to sanitize a string for SQL when not using find?

    - by williamjones
    I'm trying to sanitize a string that involves user input without having to resort to manually crafting my own possibly buggy regex if possible, however, if that is the only way I would also appreciate if anyone can point me in the right direction to a regex that is unlikely to be missing anything. There are a number of methods in Rails that can allow you to enter in native SQL commands, how do people escape user input for those? The question I'm asking is a broad one, but in my particular case, I'm working with a column in my Postgres database that Rails does not natively understand as far as I know, the tsvector, which holds plain text search information. Rails is able to write and read from it as if it's a string, however, unlike a string, it doesn't seem to be automatically escaping it when I do things like vector= inside the model. For example, when I do model.name='::', where name is a string, it works fine. When I do model.vector='::' it errors out: ActiveRecord::StatementInvalid: PGError: ERROR: syntax error in tsvector: "::" "vectors" = E'::' WHERE "id" = 1 This seems to be a problem caused by lack of escaping of the semicolons, and I can manually set the vector='\:\:' fine. I also had the bright idea, maybe I can just call something like: ActiveRecord::Base.connection.execute "UPDATE medias SET vectors = ? WHERE id = 1", "::" However, this syntax doesn't work, because the raw SQL commands don't have access to find's method of escaping and inputting strings by using the ? mark. This strikes me as the same problem as calling connection.execute with any type of user input, as it all boils down to sanitizing the strings, but I can't seem to find any way to manually call Rails' SQL string sanitization methods. Can anyone provide any advice?

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  • Scrapy issue with iTunes' AppStore

    - by Eric
    I am using Scrapy to fetch some data from iTunes' AppStore database. I start with this list of apps: http://itunes.apple.com/us/genre/mobile-software-applications/id36?mt=8 In the following code I have used the simplest regex which targets all apps in the US store. from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor from scrapy.contrib.spiders import CrawlSpider, Rule class AppStoreSpider(CrawlSpider): domain_name = 'itunes.apple.com' start_urls = ['http://itunes.apple.com/us/genre/mobile-software-applications/id6015?mt=8'] rules = ( Rule(SgmlLinkExtractor(allow='itunes\.apple\.com/us/app'), 'parse_app', follow=True, ), ) def parse_app(self, response): .... SPIDER = AppStoreSpider() When I run it I receive the following: [itunes.apple.com] DEBUG: Crawled (200) <GET http://itunes.apple.com/us/genre/mobile-software-applications/id6015?mt=8> (referer: None) [itunes.apple.com] DEBUG: Filtered offsite request to 'itunes.apple.com': <GET http://itunes.apple.com/us/app/bloomberg/id281941097?mt=8> As you can see, when it starts crawling the first page it says: "Filtered offsite request to 'itunes.apple.com'". and then the spider stops.. it also returns this message: [ScrapyHTTPPageGetter,client] /usr/lib/python2.5/cookielib.py:1577: exceptions.UserWarning: cookielib bug! Traceback (most recent call last): File "/usr/lib/python2.5/cookielib.py", line 1575, in make_cookies parse_ns_headers(ns_hdrs), request) File "/usr/lib/python2.5/cookielib.py", line 1532, in _cookies_from_attrs_set cookie = self._cookie_from_cookie_tuple(tup, request) File "/usr/lib/python2.5/cookielib.py", line 1451, in _cookie_from_cookie_tuple if version is not None: version = int(version) ValueError: invalid literal for int() with base 10: '"1"' I have used the same script for other website and I didn't have this problem. Any suggestion?

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  • Thinking Sphinx and acts_as_taggable_on plugin

    - by Brian Roisentul
    Hi, I installed Sphinx and Thinking Sphinx for ruby on rails 2.3.2. When I search without conditions search works ok. Now, what I'd like to do is filter by tags, so, as I'm using the acts_as_taggable_on plugin, my Announcement model looks like this: class Announcement < ActiveRecord::Base acts_as_taggable_on :tags,:category define_index do indexes title, :as => :title, :sortable => true indexes description, :as => :description, :sortable => true indexes tags.name, :as => :tags indexes category.name, :as => :category has category(:id), :as => :category_ids has tags(:id), :as => :tag_ids end For some reason, when I run the following command, it will bring just one announcement, that has nothing to do with what I expect. I've got many announcements, so I expected a lot of results instead. Announcement.search params[:announcement][:search].to_s, :with => {:tag_ids => 1}, :page => params[:page], :per_page => 10 I guess something is wrong, and it's not searching correctly. Can anyone give my a clue of what's going on? Thanks, Brian

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  • XML Catalog file failing to resolve

    - by newt
    I'm using an OASIS v 1.1 compatible resolver (Norm Walsh's XMLResolver in conjunction with the catalog below. However, I'm pretty sure I've made some sort of obvious error here (this is the first time I've needed to use v 1.1 features) since attempting to resolve OxChapML.dtd fails. Can anyone see something obviously wrong with this? Or even subtly wrong? <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE catalog PUBLIC "-//OASIS//DTD XML Catalogs V1.1//EN" "http://www.oasis-open.org/committees/entity/release/1.1/catalog.dtd"> <catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog"> <group xml:base="file:///Volumes/Ac-EDP/DTG/SP%20DTD%20management/OUP_DTD/"> <public publicId="-//OXFORD//DTD OXCHAPML//EN" uri="OxChapML.dtd"/> <public publicId="-//OXFORD//DTD OXENCYCLML//EN" uri="xEncyclML.dtd"/> <public publicId="-//OXFORD//DTD OXLAWML//EN" uri="OxLawML.dtd"/> <public publicId="-//OXFORD//DTD OXSTRUCTML//EN" uri="OxStructML.dtd"/> <public publicId="-//OXFORD//DTD OXLAWREPML//EN" uri="OxLawRepML.dtd"/> <public publicId="-//OXFORD//DTD OXBILINGML//EN" uri="OxBilingML.dtd"/> <public publicId="-//OXFORD//DTD OXMONOLINGML//EN" uri="OxMonolingML.dtd"/> <public publicId="-//OXFORD//DTD TIMELINES//EN" uri="timelines.dtd"/> <systemSuffix OxChapML.dtd" systemIdSuffix="OxChapML.dtd"/> <systemSuffix uri="xEncyclML.dtd" systemIdSuffix="xEncyclML.dtd"/> <systemSuffix systemIdSuffix="OxLawML.dtd" uri="OxLawML.dtd"/> <systemSuffix systemIdSuffix="OxStructML.dtd" uri="OxStructML.dtd"/> <systemSuffix systemIdSuffix="OxLawRepML.dtd" uri="OxLawRepML.dtd"/> <systemSuffix systemIdSuffix="OxBilingML.dtd" uri="OxBilingML.dtd"/> <systemSuffix systemIdSuffix="OxMonolingML.dtd" uri="OxMonolingML.dtd"/> <systemSuffix systemIdSuffix="timelines.dtd" uri="timelines.dtd"/> </group> </catalog>

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  • ejb testing issues with netbeans and openejb

    - by SibzTer
    I have created a netbeans 6.7 EnterpriseApplication project with ejb and war modules with a test stateless session ejb with a simple sayHello() method. I also added the openEjb library in order to unit test the ejb. Everything runs fine except that I keep getting the following error: Testsuite: com.myapp.test.NewEmptyJUnitTest Apache OpenEJB 3.1.1 build: 20090530-06:18 http://openejb.apache.org/ INFO - openejb.home = C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\TestEnterpriseApp-ejb INFO - openejb.base = C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\TestEnterpriseApp-ejb INFO - Configuring Service(id=Default Security Service, type=SecurityService, provider-id=Default Security Service) INFO - Configuring Service(id=Default Transaction Manager, type=TransactionManager, provider-id=Default Transaction Manager) INFO - Found ClientModule in classpath: C:\Program Files\NetBeans 6.7.1\java2\ant\lib\ant.jar INFO - Found ClientModule in classpath: C:\Program Files\NetBeans 6.7.1\java2\ant\lib\ant-launcher.jar INFO - Found EjbModule in classpath: C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\TestEnterpriseApp-ejb\build\jar INFO - Found ClientModule in classpath: C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\lib\OpenEJB\xml-resolver-1.2.jar INFO - Found ClientModule in classpath: C:\Users\me\Documents\Downloads\glassfish\lib\webservices-tools.jar INFO - Beginning load: C:\Program Files\NetBeans 6.7.1\java2\ant\lib\ant.jar INFO - Beginning load: C:\Program Files\NetBeans 6.7.1\java2\ant\lib\ant-launcher.jar INFO - Beginning load: C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\TestEnterpriseApp-ejb\build\jar INFO - Beginning load: C:\Users\me\Documents\NetBeansProjects\TestEnterpriseApp\lib\OpenEJB\xml-resolver-1.2.jar INFO - Beginning load: C:\Users\me\Documents\Downloads\glassfish\lib\webservices-tools.jar INFO - Configuring enterprise application: classpath.ear WARN - No application-client.xml found assuming annotations present: classpath.ear, module: ant.jar WARN - No application-client.xml found assuming annotations present: classpath.ear, module: ant-launcher.jar WARN - No application-client.xml found assuming annotations present: classpath.ear, module: xml-resolver-1.2.jar WARN - No application-client.xml found assuming annotations present: classpath.ear, module: webservices-tools.jar java.lang.Exception: Could not load 1/0/com/sun/codemodel/CodeWriter.class at org.apache.xbean.finder.ClassFinder.readClassDef(ClassFinder.java:730) .... Turns out that I am getting the glassfish library webservices-tools.jar from somewhere somehow and I cant find out how to get rid of it so that I dont get the bunch of Exceptions whenever I try to run any junit tests. Has anyone faced this issue before? Can you help me resolve it please? Thanks.

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  • Inheriting from ViewPage forces explicit casting of model in view

    - by Martin Hansen
    I try to inhering from ViewPage as shown in this question http://stackoverflow.com/questions/370500/inheriting-from-viewpage But I get a Compiler Error Message: CS1061: 'object' does not contain a definition for 'Spot' and no extension method 'Spot' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?) My viewpage, normally I can do Model.ChildProperty(Spot) when I inherit from ViewPage directly, so I do that here too. But it fails. <%@ Page Language="C#" Inherits="Company.Site.ViewPageBase<WebSite.Models.SpotEntity>" %> <h1><%= Html.Encode(Model.Spot.Title) %></h1> To get it working correctly I have to do like this: <%@ Page Language="C#" Inherits="Company.Site.ViewPageBase<WebSite.Models.SpotEntity>" %> <h1><%= Html.Encode(((WebSite.Models.SpotEntity)Model).Spot.Title) %></h1> Here is my classes: namespace Company.Site { public class ViewPageBase<TModel> : Company.Site.ViewPageBase where TModel:class { private ViewDataDictionary<TModel> _viewData; [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")] public new ViewDataDictionary<TModel> ViewData { get { if (_viewData == null) { SetViewData(new ViewDataDictionary<TModel>()); } return _viewData; } set { SetViewData(value); } } protected override void SetViewData(ViewDataDictionary viewData) { _viewData = new ViewDataDictionary<TModel>(viewData); base.SetViewData(_viewData); } } public class ViewPageBase : System.Web.Mvc.ViewPage { } } So how do I get it to work without the explicit cast?

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  • Converting QXmlItem to QtDomElement or similar?

    - by EightyEight
    Hello everyone. I'm parsing a fairly complicated XML file of the following structure: <root> ... ... <item> <subitem id="1"/> <text> text1 </text> </item> <item> <subitem id="2"/> <text> text2 </text> </item> ... <item> ... </item> ...</root> It's pretty crude but you get my drift I hope. I'm primarily interested in "item" nodes. So I wrote the following code (directly out of the Qt's online manual): QXmlQuery query; query.setQuery("//item/"); QXmlResultItems result; query.evaluateTo(&result); QXmlItem item(result.next()); while (!item.isNull()) { if (item.isNode()) { // WHAT DO I DO NOW? } item = result.next(); } Now, QXmlItem appears to represent two concepts, a literal value (like a string) or a Node, (which is what item.isNode() is doing). Unfortunately, I can't grasp how to convert the QXmlItem to something that will query-able again. In particular from the example above I'd like to grab the "id" attribute, and the text element. Can I do this using the XQuery approach, or am I way off base here? Any advice? Thanks!

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  • How would you implement API key in WCF Data Service?

    - by rushonerok
    Is there a way to require an API key in the URL / or some other way of passing the service a private key in order to grant access to the data? I have this right now... using System; using System.Data.Services; using System.Data.Services.Common; using System.Collections.Generic; using System.Linq; using System.ServiceModel.Web; using Numina.Framework; using System.Web; using System.Configuration; [System.ServiceModel.ServiceBehavior(IncludeExceptionDetailInFaults = true)] public class odata : DataService { public static void InitializeService(DataServiceConfiguration config) { config.SetEntitySetAccessRule("*", EntitySetRights.AllRead); //config.SetServiceOperationAccessRule("*", ServiceOperationRights.All); config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2; } protected override void OnStartProcessingRequest(ProcessRequestArgs args) { HttpRequest Request = HttpContext.Current.Request; if(Request["apikey"] != ConfigurationManager.AppSettings["ApiKey"]) throw new DataServiceException("ApiKey needed"); base.OnStartProcessingRequest(args); } } ...This works but it's not perfect because you cannot get at the metadata and discover the service through the Add Service Reference explorer. I could check if $metadata is in the url but it seems like a hack. Is there a better way?

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  • UML class diagram vs ER database diagram

    - by salva84
    Hi, I'm a little confused, I'm developing a program, the program consist in two parts, the server and the clients, there are groups, places, messages... stored in the server, and the clients has to connect with it. I've design the use cases diagram, the activity diagrams, and I have design the class diagram too. The thing is that I want to implement the server in a mysql tables for storing the users, groups, places... users in groups... so I've designed a E-R diagram consisting in 6 tables, but the problem is that I think that my class diagram and my ER diagram looks too similar, I mean, I think I'm not doing things right because I have a class for each table practically, and when I have to extract all the users on my system, do I have to convert all the rows into objects at first and write in the database for each object modified? The easy choice for me would be to base my whole application only in the database, and making a class to extract and insert data in it, but I have to follow the UML specification and I'm a little confused what to do with the class diagram, because the books I have read say that I have to create a class for each "entity" of my program. Sorry for my bad English. Thank you.

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  • Db4o Mvc Application Architecture

    - by Mac
    I am currently testing out Db4o for an asp.net MVC 2 application idea but there are a few things I'm not quite sure on the best way to proceed. I want my application to use guessable routes rather than Id's for referencing my entities but I also think I need Id's of some sort for update scenarios. so for example I want /country/usa instead of /country/1 I may want to change the key name though (not perhaps on a country but on other entities) so am thinking I need an Id to use as the reference to retrieve the object prior to updating it's fields. From other comments it seems like the UUID is a bit long to be using and would prefer to use my own id's anyway for clean separation of concerns. Looking at both the KandaAlpha project I wasn't too keen on some aspects of the design and prefer something more along the lines of S#arp architecture where they use things like the [domainsignature] and EntityWithTypedId, IEntityDuplicateChecker, IHasAssignedId, BaseObject and IValidatable in their entities to control insert/update behaviour which seems cleaner and more extensible, covers validation and is encapsulated well within the core and base repository classes. So would a port of S#arp architecture to Db4o make sense of am I still thinking rmdbs in an oodb world? Also is there a best practice for managing indexes (including Unique ones as above) in Db4o? Should they be model metadata based and loaded using DI in a bootstrapper for example or should they be more loaded more like Automapper.CreateMap? Its a bit of a rambling question I know but any thoughts, ideas or suggested reading material is greatly appreciated. Thanks Mac

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  • Complex ModelBinders and being in charge of creating part of the model

    - by Kieron
    Hi, I've a scenario where I need to bind to an interface - in order to create the correct type, I've got a custom model binder that knows how to create the correct concrete type (which can differ). However, the type created never has the fields correctly filled in. I know I'm missing something blindingly simple here, but can anyone tell me why or at least what I need to do for the model binder to carry on it's work and bind the properties? public class ProductModelBinder : DefaultModelBinder { override public object BindModel (ControllerContext controllerContext, ModelBindingContext bindingContext) { if (bindingContext.ModelType == typeof (IProduct)) { var content = GetProduct (bindingContext); return content; } var result = base.BindModel (controllerContext, bindingContext); return result; } IProduct GetProduct (ModelBindingContext bindingContext) { var idProvider = bindingContext.ValueProvider.GetValue ("Id"); var id = (Guid)idProvider.ConvertTo (typeof (Guid)); var repository = RepositoryFactory.GetRepository<IProductRepository> (); var product = repository.Get (id); return product; } } The Model in my case is a complex type that has an IProduct property, and it's those values I need filled in. Model: [ProductBinder] public class Edit : IProductModel { public Guid Id { get; set; } public byte[] Version { get; set; } public IProduct Product { get; set; } }

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  • Get paperclip to crop the image without validating

    - by Micke
    Hello fellow stackoverflow members. I have been following this guide to enable users to have their own avatar. But i have bumped in to a litle problem. When the user is cropping the image the model tries to validate all my validations. My user model looks like this: class User < ActiveRecord::Base has_attached_file :avatar, :styles => { :small => "100x100>", :large => "500x500>" }, :processors => [:cropper] attr_accessor :password, :crop_x, :crop_y, :crop_w, :crop_h attr_accessible :crop_x, :crop_y, :crop_w, :crop_h validates_confirmation_of :password validates_presence_of :password And when the user runs the crop updating script the user model tries to validate the password. But because i have no password field on the cropping page it can't validate it. Here is the updating of the crop: @user = User.find(current_user.id) if @user.update_attributes(params[:user]) flash[:notice] = "Successfully updated user." end How can i bypass this in a easy and clean way?

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  • How to arrange models, views, controllers in a new Kohana 3 project

    - by Pekka
    I'm looking at how to set up a mid-sized web application with Kohana 3. I have implemented MVC patterns in the past but never worked against a "formalized" MVC framework so I'm still getting my head around the terminology - toying around with basic examples, building views and templates, and so on. I'm progressing fairly well but I want to set up a real-world web project (one of my own that I've been planning for quite some time now) as a learning object. Example-based documentation is a bit sparse for Kohana 3 right now - they say so themselves on the site. While I'm not worried about learning the framework soon enough, I'm a bit at a loss on how to arrange a healthy code base from the start - i.e. how to split up controllers, how to name them, and how to separate the functionality into the appropriate models. My application could, in its core, be described as a business directory with a main businesses table. Businesses can be listed by category and by street name. Each business has a detail page. Business owners can log in and edit their business's entry. Businesses can post offers into an offers table. I know this is pretty vague, I'll be more than happy to go into more detail on request. Supposing I have all the basic functionality worked out and in place already - list all businesses, edit business, list businesses by street name, create offer, and so on, and I'm just looking for how to fit the functionality into a Kohana application structure that can be easily extended: Do you know real-life, publicly accessible examples of applications built on Kohana 3 where I could take a peek how they do it? Are there conventions or best practices on how to structure an extendable login area for end users in a Kohana project that is not only able to handle a business directory page, but further products on separate pages as well? Do you know application structuring HOWTOs or best practices for Kohana 3 not mentioned in the user guide and the inofficial Wiki? Have you built something similar and could give me some recommendations?

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  • NSMutableURLRequest wont try to use 3G when 3G is not 'connected' in Reachability enumeration

    - by Kyle
    I won't bother posting any code because my code works fine when I launch Safari or something that turns on the 3G connection first. When I put it Airport mode, then put back OFF, I will get the behavior of a connection error saying No internet connection with NSMutableURLRequest. I've personally mailed apple about how the Ant gets turned on and off, and they said anything that uses their base CFSocketStream object will turn on the Ant, and I quote: "such as NSURLRequest".. BSD Sockets do not, just so everyone knows.. However, I assumed NSMutableURLRequest would fall into the category of 'Does', but it seems like it doesnt. It never succeeds for me when I cycle Airport or have the phone idle for a long time. It will ALWAYS succeed when I open any other network app first to turn the Ant on. Shall I be forced to do a dummy NSURLRequest call to turn this on; or has anyone been able to get this class working just fine? Remember this is just an implementation of NSMutableURLRequest to upload a file Async, and no other Network operations are performed anywhere; no ads, no version checks, no nothing.

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  • Rails Nested Forms Attributes not saving if Fields Added with jQuery

    - by looloobs
    Hi I have a rails form with a nested form. I used Ryan Bates nested form with jquery tutorial and I have it working fine as far as adding the new fields dynamically. But when I go to submit the form it does not save any of the associated attributes. However if the partial builds when the form loads it creates the attribute just fine. I can not figure out what is not being passed in the javascript that is failing to communicate that the form object needs to be saved. Any help would be great. class Itinerary < ActiveRecord::Base accepts_nested_attributes_for :trips end itinerary/new.html <% form_for ([@move, @itinerary]), :html => {:class => "new_trip" } do |f| %> <%= f.error_messages %> <%= f.hidden_field :move_id, :value => @move.id %> <% f.fields_for :trips do |builder| %> <%= render "trip", :f => builder %> <% end %> <%= link_to_add_fields "Add Another Leg to Your Trip", f, :trips %> <p><%= f.submit "Submit" %></p> <% end %> application_helper.rb def link_to_remove_fields(name, f) f.hidden_field(:_destroy) + link_to_function(name, "remove_fields(this)") end def link_to_add_fields(name, f, association) new_object = f.object.class.reflect_on_association(association).klass.new fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder| render(association.to_s.singularize, :f => builder) end link_to_function(name, h("add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")")) end application.js function add_fields(link, association, content) { var new_id = new Date().getTime(); var regexp = new RegExp("new_" + association, "g") $(link).parent().before(content.replace(regexp, new_id)); }

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  • Cocoa threading question.

    - by Steve918
    I would like to implement an observer pattern in Objective-C where the observer implements an interface similar to SKPaymentTransactionObserver and the observable class just extends my base observable. My observable class looks something like what is below. Notice I'm making copies of the observers before enumeration to avoid throwing an exception . I've tried adding an NSLock around add observers and notify observers, but I run into a deadlock. What would be the proper way to handle concurrency when observers are being added as notifications are being sent? @implementation Observable -(void)notifyObservers:(SEL)selector { @synchronized(self) { NSSet* observer_copy = [observers copy]; for (id observer in observer_copy) { if([observer respondsToSelector: selector]) { [observer performSelector: selector]; } } [observer_copy release]; } } -(void)notifyObservers:(SEL)selector withObject:(id)arg1 withObject:(id)arg2 { @synchronized(self) { NSSet* observer_copy = [observers copy]; for (id observer in observer_copy) { if([observer respondsToSelector: selector]) { [observer performSelector: selector withObject: arg1 withObject: arg2]; } } [observer_copy release]; } } -(void)addObserver:(id)observer { @synchronized(self) { [observers addObject: observer]; } } -(void)removeObserver:(id)observer { @synchronized(self) { [observers removeObject: observer]; } }

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  • Django attribute error: 'module' object has no attribute 'is_usable'

    - by Robert A Henru
    Hi, I got the following error when calling the url in Django. It's working before, I guess it's related with some accidental changes I made, but I have no idea what they are. Thanks before for the help, Robert Environment: Request Method: GET Request URL: http://localhost:8000/time/ Django Version: 1.2 Python Version: 2.6.1 Installed Applications: ['django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.messages', 'django.contrib.admin', 'djlearn.books'] Installed Middleware: ('django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware') Traceback: File "/Library/Python/2.6/site-packages/django/core/handlers/base.py" in get_response 100. response = callback(request, *callback_args, **callback_kwargs) File "/Users/rhenru/Workspace/django/djlearn/src/djlearn/../djlearn/views.py" in current_datetime 16. return render_to_response('current_datetime.html',{'current_date':now,}) File "/Library/Python/2.6/site-packages/django/shortcuts/__init__.py" in render_to_response 20. return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs) File "/Library/Python/2.6/site-packages/django/template/loader.py" in render_to_string 181. t = get_template(template_name) File "/Library/Python/2.6/site-packages/django/template/loader.py" in get_template 157. template, origin = find_template(template_name) File "/Library/Python/2.6/site-packages/django/template/loader.py" in find_template 128. loader = find_template_loader(loader_name) File "/Library/Python/2.6/site-packages/django/template/loader.py" in find_template_loader 111. if not func.is_usable: Exception Type: AttributeError at /time/ Exception Value: 'module' object has no attribute 'is_usable'

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  • TypeConverter prevents ApplyPropertyChanges in EntityFramework

    - by Felix
    I ran into an interesting problem (hopefully, interesting not just for me :) I am running Entity Framework 1 (.NET 3.5) and ASP.NET MVC 2. I have a Customer class that has many-to-one relationship with Country class (in other words, Country is a lookup table for customers - I described more in this post: http://stackoverflow.com/questions/2404801/explicit-casting-doesnt-work-in-default-model-binding ) I got TypeConverter to work; so I am getting a perfect object into controller's Post method. Create works fine; however, in Edit I am getting the following error when I call ApplyPropertyChanges: The existing object in the ObjectContext is in the Added state. Changes can only be applied when the existing object is in an unchanged or modified state. The controller code is fairly trivial: public ActionResult Edit(Customer customerToEdit) { if (ModelState.IsValid) { Customer cust = (Customer)context.GetObjectByKey( new EntityKey("BAEntities.Customers", "CustomerID", customerToEdit.CustomerID)); context.ApplyPropertyChanges(cust.EntityKey.EntitySetName, customerToEdit); context.SaveChanges(); } return View(...); } If I remove country from the form, it works fine; and if I assign dropdown value to EntityReference "manually" - it works as well. TypeConverter code is also fairly simple, but I've never used TypeConverter before, so I may be missing something here: public override object ConvertFrom(ITypeDescriptorContext typeContext, CultureInfo culture, object value) { if (value is string) { int countryID = Int16.Parse((string)value); Country country = (Country)context.GetObjectByKey( new EntityKey("BAEntities.Countries", "CountryID", countryID)); return country; } return base.ConvertFrom(typeContext, culture, value); }

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  • How to migrate from XslTransform to XslCompiledTransform

    - by Atara
    I have the following code that I need to migrate from VS 2003 (.Net 1.1) to VS 2008 (.Net 2+) but I get compilation error - System.Xml.Xsl.XslTransform' is obsolete: This class has been deprecated. I probably need to use System.Xml.Xsl.XslCompiledTransform instead. but I do not find the matching Load() and Transform() overload versions that I can use with all the parameters of my original code. in MSDN [How to: Migrate Your XslTransform Code] I only found some simpler cases. http://msdn.microsoft.com/en-us/library/aa983475%28VS.80%29.aspx but in my code I see some remarks that hints that the added parameters were used to avoid exceptions, so I prefer to use these parameters. Can someone please help migrating this code? Thanks, Atara ' ---------------------------------------------------------------------- ' VS 2003 code: ' ---------------------------------------------------------------------- . . . Dim myXslDoc As Xml.XmlDocument ' ---------------------------------------------------------------------- Public Sub mcSetParameters(ByVal srcFileName As String) ' ---------------------------------------------------------------------- Me.myXslDoc = New Xml.XmlDocument Me.myXslDoc.Load(srcFileName) End Sub ' ---------------------------------------------------------------------- Public Sub mcSetHtml() ' ---------------------------------------------------------------------- Dim oXPathNav As System.Xml.XPath.XPathNavigator = xmlDoc.DocumentElement.CreateNavigator() Dim sbContent As New System.Text.StringBuilder Dim swContent As New System.IO.StringWriter(sbContent) Dim args As New System.Xml.Xsl.XsltArgumentList args.AddParam("paramName1", "", paramVal1.ToString) args.AddParam("paramName2", "", paramVal2.ToString) Try ' Try to avoid "Invalid site" exception, by using XmlUrlResolver and Evidence. ' If the XSLT stylesheet . . . comes from a code base that you trust, Then use Me.GetType().Assembly.Evidence() Dim resolver As System.Xml.XmlUrlResolver = New System.Xml.XmlUrlResolver resolver.Credentials = System.Net.CredentialCache.DefaultCredentials Dim xslt As System.Xml.Xsl.XslTransform = New System.Xml.Xsl.XslTransform xslt.Load(Me.myXslDoc, resolver, Me.GetType().Assembly.Evidence()) xslt.Transform(oXPathNav, args, swContent, Nothing) Catch ex As Exception Debug.WriteLine("Exception: {0}", ex.ToString()) End Try DoSomething(sbContent.ToString()) End Sub ' ----------------------------------------------------------------------

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  • C# - closures over class fields inside an initializer?

    - by Richard Berg
    Consider the following code: using System; namespace ConsoleApplication2 { class Program { static void Main(string[] args) { var square = new Square(4); Console.WriteLine(square.Calculate()); } } class MathOp { protected MathOp(Func<int> calc) { _calc = calc; } public int Calculate() { return _calc(); } private Func<int> _calc; } class Square : MathOp { public Square(int operand) : base(() => _operand * _operand) // runtime exception { _operand = operand; } private int _operand; } } (ignore the class design; I'm not actually writing a calculator! this code merely represents a minimal repro for a much bigger problem that took awhile to narrow down) I would expect it to either: print "16", OR throw a compile time error if closing over a member field is not allowed in this scenario Instead I get a nonsensical exception thrown at the indicated line. On the 3.0 CLR it's a NullReferenceException; on the Silverlight CLR it's the infamous Operation could destabilize the runtime.

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  • Need some help for the issues that caused because of secret key in rails application

    - by sam
    I have a weird problem. I have a rails application. When I am trying to run the ruby script/about command, it is displaying the details when the secret key in config/initializers/session_store.rb was removed or commented. When I place the secret key in the file and if i runs the ruby script/about command it is throwing error as c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependenc es.rb:443:in `load_missing_constant': uninitialized constant ActionController ( ameError) from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_supp rt/dependencies.rb:80:in `const_missing' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_supp rt/dependencies.rb:92:in `const_missing' from D:/chat/config/initializers/session_store.rb:13 from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `g m_original_require' from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `r quire' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_supp rt/dependencies.rb:156:in `require' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_supp rt/dependencies.rb:521:in `new_constants_in' from c:/ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_supp rt/dependencies.rb:156:in `require' ... 7 levels... from c:/ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/commands/about.rb:1 from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `g m_original_require' from c:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `r quire' from script/about:3 In config/initializers/session_store.rb file the error is shown for the below code. ActionController::Base.session = { :key => '_chat_session', :secret => '0fb230c7ae72f9a0cb2417b0ad75db3b48cabf327eeedb0557ae07ecf894f34f55e2dfb9ce6c49f05959ceac9812a7193de04690a931fcf757973195a84cd2d2' } Could anyone please help me. Thanks in-advance, sam

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  • Django Admin: OneToOne Relation as an Inline?

    - by Jim Robert
    I am putting together the admin for a satchmo application. Satchmo uses OneToOne relations to extend the base Product model, and I'd like to edit it all on one page. It is possible to have a OneToOne relation as an Inline? If not, what is the best way to add a few fields to a given page of my admin that will eventually be saved into the OneToOne relation? for example: class Product(models.Model): name = models.CharField(max_length=100) ... class MyProduct(models.Model): product = models.OneToOne(Product) ... I tried this for my admin but it does not work, and seems to expect a Foreign Key: class ProductInline(admin.StackedInline): model = Product fields = ('name',) class MyProductAdmin(admin.ModelAdmin): inlines = (AlbumProductInline,) admin.site.register(MyProduct, MyProductAdmin) Which throws this error: <class 'satchmo.product.models.Product'> has no ForeignKey to <class 'my_app.models.MyProduct'> Is the only way to do this a Custom Form? edit: Just tried the following code to add the fields directly... also does not work: class AlbumAdmin(admin.ModelAdmin): fields = ('product__name',)

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  • GDI RoundRect on Compact Framework: make rounded rectangle's outside transparent.

    - by VansFannel
    Hello! I'm using the RoundRect GDI function to draw a rounded rectangle following this example: .NET CF Custom Control: RoundedGroupBox Because all controls are square, it also draw the corners outside of the rounded rectangle. How can I make this space left outside the rectangle transparent? The OnPaint method is: protected override void OnPaint(PaintEventArgs e) { int outerBrushColor = HelperMethods.ColorToWin32(m_outerColor); int innerBrushColor = HelperMethods.ColorToWin32(this.BackColor); IntPtr hdc = e.Graphics.GetHdc(); try { IntPtr hbrOuter = NativeMethods.CreateSolidBrush(outerBrushColor); IntPtr hOldBrush = NativeMethods.SelectObject(hdc, hbrOuter); NativeMethods.RoundRect(hdc, 0, 0, this.Width, this.Height, m_diametro, m_diametro); IntPtr hbrInner = NativeMethods.CreateSolidBrush(innerBrushColor); NativeMethods.SelectObject(hdc, hbrInner); NativeMethods.RoundRect(hdc, 0, 18, this.Width, this.Height, m_diametro, m_diametro); NativeMethods.SelectObject(hdc, hOldBrush); NativeMethods.DeleteObject(hbrOuter); NativeMethods.DeleteObject(hbrInner); } finally { e.Graphics.ReleaseHdc(hdc); } if (!string.IsNullOrEmpty(m_roundedGroupBoxText)) { Font titleFont = new Font("Tahoma", 9.0F, FontStyle.Bold); Brush titleBrush = new SolidBrush(this.BackColor); try { e.Graphics.DrawString(m_roundedGroupBoxText, titleFont, titleBrush, 14.0F, 2.0F); } finally { titleFont.Dispose(); titleBrush.Dispose(); } } base.OnPaint(e); } An the OnPaintBackground is: protected override void OnPaintBackground(PaintEventArgs e) { if (this.Parent != null) { SolidBrush backBrush = new SolidBrush(this.Parent.BackColor); try { e.Graphics.FillRectangle(backBrush, 0, 0, this.Width, this.Height); } finally { backBrush.Dispose(); } } } Thank you!

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  • CGContext - PDF margin

    - by Manoj Khaylia
    Hi All I am showing PDF content on a view using this code using Quartz Sample // PDF page drawing expects a Lower-Left coordinate system, so we flip the coordinate system // before we start drawing. CGContextTranslateCTM(context, 0.0, self.bounds.size.height); CGContextScaleCTM(context, 1.0, -1.0); // Grab the first PDF page CGPDFPageRef page = CGPDFDocumentGetPage(pdf, pageNo); // We're about to modify the context CTM to draw the PDF page where we want it, so save the graphics state in case we want to do more drawing CGContextSaveGState(context); // CGPDFPageGetDrawingTransform provides an easy way to get the transform for a PDF page. It will scale down to fit, including any // base rotations necessary to display the PDF page correctly. CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, self.bounds, 0, true); // And apply the transform. CGContextConcatCTM(context, pdfTransform); // Finally, we draw the page and restore the graphics state for further manipulations! CGContextDrawPDFPage(context, page); CGContextRestoreGState(context); Using this all works fine I want to set the margin for the PDF context, bydefault it showing 50 px margin in every side.. I have tried CGContext methods but not got the appropriate one. Can any body help me regarding this Thanks Monaj

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