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• In Django : How to serialize dict object to json ?

  - by Rohit

  I have this very basic problem, >>> serializers.serialize("json", {'a':1}) Traceback (most recent call last): File "<console>", line 1, in <module> File "/usr/lib/pymodules/python2.6/django/core/serializers/__init__.py", line 87, in serialize s.serialize(queryset, **options) File "/usr/lib/pymodules/python2.6/django/core/serializers/base.py", line 40, in serialize for field in obj._meta.local_fields: AttributeError: 'str' object has no attribute '_meta' >>> How can this be done ? Thanks in advance !

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• How to move an element in a sorted list and keep the CouchDb write "atomic"

  - by karlthorwald

  I have elements of a list in couchdb documents. Let's say these are 3 elements in 3 documents: { "id" : "783587346", "type" : "aList", "content" : "joey", "sort" : 100.0 } { "id" : "358734ff6", "type" : "aList", "content" : "jill", "sort" : 110.0 } { "id" : "abf587346", "type" : "aList", "content" : "jack", "sort" : 120.0 } A view retrieves all "aList" documents and displays them sorted by "sort". Now I want to move the elements, when I want to move "jack" to the middle, I could do this atomic in one write and change it's sort key to 105.0. The view now returns the documents in the new sort order. After a lot of sorting I could end up with sort keys like 50.99999 and 50.99998 after some years and in extreme situations run out of digits? What can you recommend, is there a better way to do this? I'd rather keep the elements in seperate documents. Different users might edit different elements in parallel (which also can get tricky). Maybe there is a much better way?

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• Html string replace a span's class doesn't work in IE?

  - by SeanJA

  Someone tried to recreate smarty in js: // actually from a template file, not hardcoded in the javascript html = '<span class="{test}">yay</span>'; html = change(html, 'test', 'foo bar'); function change(html, key, value){ html = html.replace('{'+key+'}',value); html = html.replace('%7B'+key+'%7D',value); return html; } element.innerHTML = html; In FF this works fine (as expected): yay In IE 7/8 and probably 6... it gives me this: <span class="foo" bar="">yay</span> Why does it create the extra attribute instead of doing what I expected it to do?

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• Processing file uploads before object is saved

  - by Dominic Rodger

  I've got a model like this: class Talk(BaseModel): title = models.CharField(max_length=200) mp3 = models.FileField(upload_to = u'talks/', max_length=200) seconds = models.IntegerField(blank = True, null = True) I want to validate before saving that the uploaded file is an MP3, like this: def is_mp3(path_to_file): from mutagen.mp3 import MP3 audio = MP3(path_to_file) return not audio.info.sketchy Once I'm sure I've got an MP3, I want to save the length of the talk in the seconds attribute, like this: audio = MP3(path_to_file) self.seconds = audio.info.length The problem is, before saving, the uploaded file doesn't have a path (see this ticket, closed as wontfix), so I can't process the MP3. I'd like to raise a nice validation error so that ModelForms can display a helpful error ("You idiot, you didn't upload an MP3" or something). Any idea how I can go about accessing the file before it's saved? p.s. If anyone knows a better way of validating files are MP3s I'm all ears - I also want to be able to mess around with ID3 data (set the artist, album, title and probably album art, so I need it to be processable by mutagen).

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• Run WPF Application from another assembly

  - by Ricibald

  I want to run my wpf application "A" from another assembly "B". I use the following code: static void main() { var app = new A.App(); app.InitializeComponent(); app.Run(); } when i run my app I got the following error: Cannot convert string '/Resources/icon.gif' in attribute 'Icon' to object of type 'System.Windows.Media.ImageSource'. Cannot locate resource 'resources/icon.gif'. Error at object 'MainWindow' in markup file 'A;component/shell/shellview.xaml'. How can I transfer from B images and resources info to A? Thanks!

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• XForms: set relevancy for a list

  - by Purni

  I have a list element in my model instance. I am using Orbeon XForms. <mypage> <list name='mylist'/> <status /> </mypage> Status can be Private or Public. In xforms:binding, I want to set relevant attribute for showing/hiding the list. The list is bound to a drop-down. If status is Private I want to show the list, if status is Public I want to hide the list. I tried the following and it does not work. <xforms:bind nodeset="instance('myinstance')/list[@name='mylist']" relevant="instance('myinstance')/status='Private'" />

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• how to perform click to the output of ActionLink by jQuery or javascript?

  - by user324003

  <%= Ajax.ActionLink("Edit", "Update", "Home", new { id = item.mID }, new AjaxOptions { OnBegin = "function(){ $('#edit" + item.mID + "').show();}", HttpMethod = "get", UpdateTargetId = "edit" + item.mID })%> The above code generates the html source code. when user click the link, it works well. But there're so many links there, I must click them one by one. Is there any method to click once, all of them excutes? I tried the method: $("a.buttonID").click() and modified the above code: <%= Ajax.ActionLink("Edit", "Update", "Home", new { id = item.mID }, new AjaxOptions { OnBegin = "function(){ $('#edit" + item.mID + "').show();}", HttpMethod = "get", UpdateTargetId = "edit" + item.mID } new{@class="buttonID"})%> But it doesn't work. Because it only excutes the onclick event of a tag, the href attribute doesn't work.

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• LINQ-to-entities - Null reference

  - by BlueRaja

  I could swear this was working the other day: var resultSet = (from o in _entities.Table1 where o.Table2.Table3.SomeColumn == SomeProperty select o ).First(); SelectedItem = resultSet.Table2.SomeOtherColumn; I am getting a null reference exception on the last line: resultSet.Table2 is null. Not only am I sure that all the foreign keys and whatnot have the correct values, but I don't see how Table2 could be null, since o.Table2.Table3.SomeColumn == SomeProperty. resultSet is being returned with all its properties set to the correct values, with the exception that Table2 is null.

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• NHibernate Validator - how to validate enum type

  - by Herr W.

  I'm using nhibernate validator in my current solution. Everythings is almost fine but... My view model has a property of type Gender (see example below) public virtual Gender Gender { get; set; } public enum Gender { Female = 1, Male = 2 } Now i like to have some validation to ensure that the gender property ist set. But neither the NotEmpty nor the NotNull Attribute fulfil the requirement. Is there a kind of a generic solution or best practice to handle enum validations. Thanks in advance.

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• Git fatal: remote end hung up

  - by Bill

  So I thought I had finally got everything setup on Windows ... then ran into this issue. Current setup URL: ssh://user@host:port/myapp.git Already run Putty - and can connect using valid .ppk keys through the ~/.ssh/authorized_keys direct. In Git and TortoiseGIT - I set both to use "plink.exe". Putty works fine - no issues - but when I run that URL into bash I get for a git clone (url) fatal: the remote end hung up expectedly In a cygwin bash terminal - running "ssh user@host" - works no probs at all. Anyone suggest anything?

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• add ANOTHER primary key to a table which is UNIQUE

  - by gdubs

  so im having problems with adding another primary key to my table. i have 3 columns: 1. Account ID (Identity) 2. EmailID 3. Data field when i made the table i had this to make the Account ID and the Email ID unique PRIMARY KEY (AccountID, EmailID) i thought that would make my emailid unique, but then after i tried inserting another row with the same emailid it went through. so i thought i missed something out. now for my question: IF, i had to use alter, How do i alter the table/PK Constraint to modify the EmailID field and make it Unique IF i decided to drop the table and made a new one, how do i make those two primary keys uniqe? Thanks a bunch!!

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• How to deal with presence or not of xml namespaces using xslt.

  - by Mycol

  I have some XML/TEI documents, and i'm writing an XSLT 2.0 to extract their content. Almost all TEI documents has no namespace, but one has the default namespace (xmlns="http://www.tei-c.org/ns/1.0"). So all documents has the same aspect, with unqulified tags like <TEI> or <teiHeader>, but if I try to extract the content, all works with "non-namespaced-documents", but nothing (of course) is extracted from the namespaced-document. So i used the attribute xpath-default-namespace="http://www.tei-c.org/ns/1.0" and now (of course) the only document working is the namespaced one. I can't edit documents at all, so what I'm asking is if there's a way to change dynamically the xpath-default-namespace in order to make work xpaths like //teiHeader both with namespaced and non-namespaced documents

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• ExpectedException on TestMethod Visual Studio 2010

  - by Joop

  Today I upgraded my solution with all the underlying projects from VS2008 to VS2010. Everything went well except for my unit tests. First of all only the web projects had as target framework .NET 4. All the other projects still had .NET 3.5. I changed them all to .NET 4. Now when I debug my unit tests it breaks on every exception. In 2008 it just wouldn't pass and tell me that an exception occurred. Even when I have the ExpectedException attribute defined it stops debugging on every exception. And example of one of my tests: [TestMethod] [ExpectedException(typeof(EntityDoesNotExistException))] public void ConstructorTest() { AddressType type = new AddressType(int.MaxValue); } The EntityDoesNotExistException is a custom exception and inherits Exception.

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• Display value of a django form field in a template?

  - by Eran Kampf

  I have a form with an email property. When using {{ form.email }} in case of some validation error, django still renders the previous value in the input tag's value attribute: <input type="text" id="id_email" maxlength="75" class="required" value="[email protected]" name="email"> I want to render the input tag myself (to add some javascript code and an error class in case of an error). For example this is my template instead of {{ form.email }}: <input type="text" autocomplete="on" id="id_email" name="email" class="email {% if form.email.errors %}error{% endif %}"> However this does not display the errorneous value ("[email protected]" in this example) to the user. How do I get the field's value in the template?

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• Objective-C - How To Remove Characters From a String?

  - by iAm

  I have a UILable that has a formatted String (formatted for currency), so there is a dollar sign, $21.34. In the core data entity the attribute is of a type double, I am using an NSDecimalNumber to save to the database. self.purchase.name = self.nameTextField.text; NSString *string = self.amountLabel.text NSDecimalNumber *newAmount = [[NSDecimalNumber alloc] initWithString:string]; NSLog(@"%@", string); // THIS RETURNS NaN, because of dollar sign i think NSManagedObjectContext *context = self.purchase.managedObjectContext; NSError *error = nil; if (![context save:&error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } Anyway, I need this to not be NaN, so my thinking is to remove the dollar sign, but i do not know how to do that, or perhaps there is a better way to accomplish my goal.

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• Storing an image map in a database

  - by ColoradoRockie

  I have a requirement to allow users in a content management system to create their own image maps through a gui interface, which I have accomplished. But instead of saving the image map to the page code, I want to save the image map code to a database (sql), which I've also accomplished. When I started down this road in my head I was thinking the whole time that I'd just add the "usemap" attribute at runtime shown below where promo1.ImageMap holds the entire map code: if(promo1.HasImageMap) imgPromotion1.Attributes.Add("usemap", promo1.ImageMap); I guess I didn't think it though well enough, because it seems that "usemap" only expects the name of the existing map to use from the page code, and not the map code as a string. Does anyone have any clever ideas on how to apply the map from the database to the image at run time?

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• Using set with values from a table

  - by gozzilli

  I'm writing a database of all DVDs I have at home. One of the fields, actors, I would like it to be a set of values from an other table, which is storing actors. So for every film I want to store a list of actors, all of which selected from a list of actors, taken from a different table. Is it possible? How do I do this? It would be a set of foreign keys basically. I'm using a MySQL database for a Django application (python), so any hint in SQL or Python would be much appreciated. I hope the question is clear, many thanks.

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• Calculating co-ordinate of a point on a path given a distance

  - by Alex

  I'm working on a project that surveys the condition of a road or highway using a calibrated trip computer connected to a rugged-PC. An operator keys in defect codes as they travel along a pre-defined route. I need to show an indicator on the map screen that shows the vehicles current position, taking into account the distance data from the trip computer. I know the exact lat lon co-ordinates at the starting point of each section of road, and the road is made up of a series of points. The question is: how can I calculate the lat lon co-ordinates of the vehicle assuming that it has continued on the route and traveled a certain distance (e.g. 1.4km). The co-ordinates would be 'locked onto' the road line, as shown in blue on the diagram below. Thanks, Alex

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• How to enable i18n from within setup_app in websetup.py ?

  - by daniel

  From within the setup_app function (websetup.py) of a pylons i18n application, which is making use of a db, I was trying to initiate multilingual content to be inserted into the db. To do so the idea was something like: necessary imports here def setup_app(command, conf, vars): .... for lang in langs: set_lang(lang) content=model.Content() content.content=_('content') Session.add(content) Session.commit() Unfortunately it seems that it doesn't work. the set_lang code line is firing an exception as follows: File ".. i18n/translation.py", line 179, in set_lang translator = _get_translator(lang, **kwargs) File ".. i18n/translation.py", line 160, in _get_translator localedir = os.path.join(rootdir, 'i18n') File ".. /posixpath.py", line 67, in join elif path == '' or path.endswith('/'): AttributeError: 'NoneType' object has no attribute 'endswith' Actually I'm even not sure it could be possible launching i18n mechanisms from within this setup_app function without an active request object. Anyone has tried some trick on a similar story ?

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• Entities groups in transactions

  - by Joel

  In the context of "Keys and Entity Groups" article by google: http://code.google.com/appengine/docs/python/datastore/transactions.html 1) "Only use entity groups when they are needed for transactions" 2) "Every entity belongs to an entity group, a set of one or more entities that can be manipulated in a single transaction." It seems like entity groups exist only for the use of transactions, i.e. making one transaction possible between all entities in a group. My question is then why are there parent-child relations between entities and not just a simple declaration of entities to be in a single group (that is defining A,B,C to be in the same group as opposed to defining relations between them "A (parent of) B, B (parent of C)"). What is the benefit from using parent-child relation model when the only purpose is for entities to be in the same group to make transaction possible? Thanks Joel

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• Html.DescriptionFor<T>

  - by Stacey

  I'm trying to emulate the Html Helper for "LabelFor" to work with the [Description] Attribute. I'm having a lot of trouble figuring out how to get the property from the helper though. This is the current signature... class Something { [Description("Simple Description")] [DisplayName("This is a Display Name, not a Description!")] public string Name { get; set; } } public static MvcHtmlString DescriptionFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression);

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• Is there any way to limit the size of an STL Map?

  - by Nathan Fellman

  I want to implement some sort of lookup table in C++ that will act as a cache. It is meant to emulate a piece of hardware I'm simulating. The keys are non-integer, so I'm guessing a hash is in order. I have no intention of inventing the wheel so I intend to use stl::map for this (though suggestions for alternatives are welcome). The question is, is there any way to limit the size of the hash to emulate the fact that my hardware is of finite size? I'd expect the hash's insert method to return an error message or throw an exception if the limit is reached. If there is no such way, I'll simply check its size before trying to insert, but that seems like an inelegant way to do it.

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• How entity edit URL from within plug-in in MS Dyanmics CRM 4.0

  - by Greg McGuffey

  I would like to have a workflow create a task, then email the assigned user that they have a new task and include a link to the newly created task in the body of the email. I have client side code that will correctly create the edit URL, using the entities GUID and stores it in a custom attribute. However, when the task is created from within a workflow, the client script isn't run. So, I think a plug-in should work, but I can't figure out how to determine the URL of the CRM installation. I'm authoring this in a test environment and definitely don't want to have to change things when I move to production. I'm sure I could use a config file, but seems like the plug-in should be able to figure this out at runtime. Anyone have any ideas how to access the URL of the crm service from within a plug-in? Any other ideas? Thanks!

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• how to get obj2.name via obj1.categories(), thanks (gae python)

  - by zjm1126

  i using google-app-engine webapp ,code is : class Post(db.Model): title = db.StringProperty(required=True) def categories(self): return (x.category for x in self.postcategory_set) class Category(db.Model): name = db.StringProperty() class PostCategory(db.Model): post = db.ReferenceProperty(Post) category = db.ReferenceProperty(Category) class sss(webapp.RequestHandler): def get(self): obj1 = Post(title='hhaa') #obj1.title = 'haha' obj1.put() obj2 = Category() obj2.name='haha-kao' obj2.put() obj3=PostCategory() obj3.post=obj1 obj3.category=obj2 obj3.put() self.response.out.write(obj1.categories().get().name) the error is : Traceback (most recent call last): File "D:\Program Files\Google\google_appengine\google\appengine\ext\webapp\__init__.py", line 511, in __call__ handler.get(*groups) File "D:\zjm_code\helloworld\a.py", line 131, in get self.response.out.write(obj1.categories().get().name) AttributeError: 'generator' object has no attribute 'get' so how to get the obj2.name via obj1's method thanks

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• VBS Script for modifying multi-value Active Directory display specifier

  - by sh-beta

  Following the howto Extending the Active Directory Schema To Track Custom Info I'm able to setup a single-value schema attribute that is easily changeable via a context menu in ADUC. Multi-value schema attributes get considerably more complicated. Say (for the sake of argument) my value is "Projects" and each user may be a list as many projects as necessary. Following is a sad little script that will set Project to a single value: Dim oproject Dim oUser1 Dim temp1 Set oproject = Wscript.Arguments Set oUser1 = GetObject(oproject(0)) temp1 = InputBox("Project: " & oUser1.project & vbCRLF & vbCRLF & "Project") if temp1 <> "" then oUser1.Put "project",temp1 oUser1.SetInfo Set oUser1 = Nothing Set oproject = Nothing Set temp1 = Nothing WScript.Quit How can I modify this to allow, assign, and modify multiple values?

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