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• How to get the app a Django model is from?

  - by e-satis

  I have a model with a generic relation: TrackedItem --- genericrelation ---> any model I would like to be able to generically get, from the initial model, the tracked item. I should be able to do it on any model without modifying it. To do that I need to get the content type and the object id. Getting the object id is easy since I have the model instance, but getting the content type is not: ContentType.object.filter requires the model (which is just content_object.__class__.__name__) and the app_label. I have no idea of how to get in a reliable way the app in which a model is. For now I do app = content_object.__module__.split(".")[0], but it doesn't work with django contrib apps.

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• C# class code loaded in RAM ?

  - by Spi1988

  hi, I would like to know whether the actual code of a C# class gets loaded in RAM when you instantiate the class? So for example if I have 2 Classes CLASS A , CLASS B, where class A has 10000 lines of code but just 1 field, an int. And class B has 10 lines of code and also 1 field an int as well. If I instantiate Class A will it take more RAM than Class B due to its lines of code ? A supplementary question, If the lines of code are loaded in memory together with the class, will they be loaded for every instance of the class? or just once for all the instances? Thanks in advance.

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• Self-contained python installation with executable tools included (pip, orbited, etc)

  - by Tristan

  I'm trying deploy a Python application on Windows as a folder that includes a full python 2.6 folder. I don't need/want a fancy solution like py2exe, I'm just trying to automate deployment of a web application. So long as I include python26.dll and set the PYTHONHOME correctly, things seem to work if I just include the Python26 folder in its entirety. However a number of the Python26/Script files don't work. For instance, pip.exe, orbited.exe, and morbid.exe all do nothing (complete with no output) when I try to run them on a system that doesn't have a real Python26 installation. I've run out of ideas. Suggestions?

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• Major inconsistencies in Zend Framework

  - by John Nall

  Okay first of all let me just say Zend Framework is the greatest tool I have ever used in 30+ years of programming (well, for web development, Qt wins the desktop market). However, through my use I have noticed some glaring and annoying inconsistencies. For instance, Zend_Form_Element's have a setAttrib() method. Now why the hell is this the only method in that API which is abbrev.? Why then am I using setRequired() instead of setReq()? I have more examples, I am extremely nerd raged about this. It is completely ruining what could have been God's gift to web development. FOR FUTURE REFERENCE NEVER ABBREV. THINGS WHEN MAKING AN API. also always filter data before storing it i m o Who do we talk to about this, where something will actually get done about it?

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• Different RegisterWindowMessage() names appear the same

  - by Mike Trader

  Using the C/C++ Windows API RegisterWindowMessage() I am using the name of the application as the message name. Next I call CreatMutex() using the same name so that I can tell if it already exists. If it does, I know this application is already running and not to launch a second instance of it. THis is the operation of my function Running() My confusion is over the message name. It seems that "AutoConvert.exe" and "AutoAppend.exe" are interpreted as the same name. Why?

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• Is there a server side API for Team Foundaion Server

  - by Ralph Shillington

  It would seem there is precious little documentation on programming against a TFS 2010 instance. What bits I have found, have next to nothing in the case of documentation beyond barebones listing of client access classes and their members, most likely autogenerated from the code comments. As I'm interested in building a silverlight client against TFS, I will need access to server side API (ideally the silverlight app will talk to my server (mainly for work items) and my server will in turn talk to the TFS server for the goods. Where is the doumentation (if any) for this kind of TFS integration?

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• SqlCeCommand ExecuteNonQuery performance issue

  - by Michael

  I've been asked to resolve an issue with a .Net/SqlServerCe application. Specifically, after repeated inserts against the db, performance becomes increasingly degraded. In one instance at ~200 rows, in another at ~1000 rows. In the latter case the code being used looks like this: Dim cm1 As System.Data.SqlServerCe.SqlCeCommand = cn1.CreateCommand cm1.CommandText = "INSERT INTO Table1 Values(?,?,?,?,?,?,?,?,?,?,?,?,?)" For j = 0 To ds.Tables(0).Rows.Count - 1 'this is 3110 For i = 0 To 12 cm1.Parameters(tbl(i, 0)).Value = Vals(j,i) 'values taken from a different db Next cm1.ExecuteNonQuery() Next The specifics aren't super important (like what 'tbl' is, etc) but rather whether or not this code should be expected to handle this number of inserts, or if the crawl I'm witnessing is to be expected.

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• How can I declare a pointer structure using {}?

  - by Y_Y

  This probably is one of the easiest question ever in C programming language... I have the following code: typedef struct node { int data; struct node * after; struct node * before; }node; struct node head = {10,&head,&head}; Is there a way I can make head to be *head [make it a pointer] and still have the availability to use '{ }' [{10,&head,&head}] to declare an instance of head and still leave it out in the global scope? For example: //not legal!!! struct node *head = {10,&head,&head};

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• disable download of my paid app in Android

  - by Boy

  I have a paid app in the store which will remove the ads in another app when it is installed on that device. Now I want to remove this 'remove ads' app, as I want to have an in-app payement for this for instance (or maybe I just keep the ads version only). But the problem is, if I unpublish the app, people who bought it will not be able to download it again when they get a new phone or reset their phone. How to I keep the app in the Play Store, but prevent people from buying it? Is this possible? My backup plan is: make the app cost 10.000 euro's and put in the message that this app should not be bought anymore. But I don't like that...

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• Hibernate Criteria API: get n random rows

  - by hadrien

  I can't figure out how to fetch n random rows from a criteria instance: Criteria criteria = session.createCriteria(Table.class); criteria.add(Restrictions.eq('fieldVariable', anyValue)); ... Then what? I can't find any doc with Criteria API Does it mean I should use HQL instead? Thanx! EDIT: I get the number of rows by: int max = criteria.setProjecxtion(Projections.rowCount()).uniqueResult(); How do I fetch n random rows with indexes between 0 and max? Thx again!

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• What is dbReferenceProperty?

  - by user246114

  Hi, In the python app engine docs, I see something called dbReferenceProperty. I can't understand what it is, or how it's used. I'm using the java interface to app engine, so I'm not sure if there's an equivalent. I'm interested in it because it sounds like some sort of pseudo-join, where we can point a property of a class to some other object's value - something like if we had: class User { private String mPhotoUrl; private String mPhone; private String mState; private String mCountry; .. etc .. } class UserLite { @ReferenceProperty User.mPhotoUrl; private String mPhotoUrl; } then if we had to update a User object's mPhotoUrl value, the change would somehow propagate out to all UserLite instances referencing it, rather than having to update every UserLite object instance manually, Thanks

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• Rails model to represent multiple fields

  - by Tristan O'Neil

  I'm developing a rails project where I have one data model with multiple fields that are collection selects. I'd like to create another model to represent all of these collection select fields. So, for instance, my main data model has three collection select fields -- one for county, one for category, and one for classification. I could separate these into three separate data models, but that seems redundant since they all share the same characteristics. They have a type and a value, like a county is a county and it has a value of let's say Sonoma, just as category has a type of category and a value of let's say Winery. If you've ever used Drupal, I'm basically looking for the behavior of the taxonomy functionality. So you see my dilemma: I need to separate these fields into three separate fields but they have very similar data structures. Any suggestions would be greatly appreciated.

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• Delphi : What is the best way for passing data between forms?

  - by Flom Enol

  It may seem a little newbie, but I really have got problem with it. I have a form (not the main one)for getting many different data form the user and I want to pass it to a manager class for creating an object with these. The problem is that I can't have this class to use the other unit (getting circle uses) and also it doesn't have access to the manager class instance (which is in main form). So, what shall I do? I've already considered using public variable but I have a bad feeling about it (regarding OOD patterns). Any ideas? thanks in advance.

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• About curse of dimensionality

  - by Dan

  My question is about this topic I've been reading about a bit. Basically my understanding is that in higher dimensions all points end up being very close to each other. The doubt I have is whether this means that calculating distances the usual way (euclidean for instance) is valid or not. If it were still valid, this would mean that when comparing vectors in high dimensions, the two most similar wouldn't differ much from a third one even when this third one could be completely unrelated. Is this correct? Then in this case, how would you be able to tell whether you have a match or not?

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• getting the url of the page and the url of the selected hyperlink

  - by Dan

  Hi This is pretty hard to explain but i'll give it a shot. Working with Safari to create an extension as is now possible with Safari 5 - how would I go about getting the URL of the current page with using JavaScript and the Safari API? I would also like to be able to get a hyperlink that is selected. For instance in Safari when you right click on a hyperlink and it says open in a new tab, open in a window etc - clicking opens that hyperlink. What part of the API is used to get access to the link itself, and how does it know its a link in the first place? I hope thats clear enough. Thanks

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• How can I get a Dialog style activity window to fill the screen?

  - by Matthias

  I am using an activity with the dialog theme set, and I want it to be full screen. I tried all sorts of things, even going through the WindowManager to expand the window to full width and height manually, but nothing works. Apparently, a dialog window (or an activity with the dialog theme) will only expand according to its contents, but even that doesn't always work. For instance, I show a progress bar circle which has width and height set to FILL_PARENT (so does its layout container), but still, the dialog wraps around the much smaller progress bar instead of filling the screen. There must be a way of displaying something small inside a dialog window but have it expand to full screen size without its content resizing as well?

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• In few words, what can be said about Func<>

  - by Richard77

  Hello, I've been seing Func< for sometime now, and I've manage to avoid it (for now). But, now it looks like I can't dodge it forever. For instance, I tried Dynamic Linq, but almost everything was in terms of Func<. I've tried one of my book (C# 2008/Deitel&Deitel) and also MSDN but I'm not getting it yet. They all jump straight in the subject. What can be said (in few words) about Func< Can I get some links on the web that can get me started on that matter? Thanks for helping

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• Extending appengine's db.Property with caching

  - by Noio

  I'm looking to implement a property class for appengine, very similar to the existing db.ReferenceProperty. I am implementing my own version because I want some other default return values. My question is, how do I make the property remember its returned value, so that the datastore query is only performed the first time the property is fetched? What I had is below, and it does not work. I read that the Property classes do not belong to the instances, but to the model definition, so I guess that the return value is not cached for each instance, but overwritten on the model every time. Where should I store this _resolved variable? class PageProperty(db.Property): data_type = Page def get_value_for_datastore(self, model_instance): page = super(PageProperty, self).get_value_for_datastore(model_instance) self._resolved = page return page.key().name() def make_value_from_datastore(self, value): if not hasattr(self, '_resolved'): self._resolved = Page.get_by_name(value) return self._resolved

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• Run a site on Scheme

  - by Lajla

  I can't find this on Google (so maybe it doesn't exist), but I basically'd like to install something on a web server such that I can run a site on Scheme, PHP is starting to annoy me, I want to get rid off it, what I want is: Run Scheme sources towards UTF-8 output (duh) Support for SXML, SXLT et cetera, I plan to compose the damned thing in SXML and - to normal representation on at the end. Ability to read other files from the server, write them, set permissions et cetera Also some things to for instance determine the filesize of files, height of images, mime-types and all that mumbo-jumbo (optionally) connect to a database, but for what I want to do storing the entire database in S-expressions itself is feasible enough I don't need any fancy libraries and other things that come with it like CMS'es and what-not, except the support for SXML but I'm sure I can just find a lib for that anyway that I can load.

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• How do I produce an external URL as part of a replace_html call in Ruby on Rails?

  - by vlasits

  Basically, I am attempting to render an external website (the url of which is stored in the database) into a page in my Ruby on Rails app. I have a field in my model 'search' called 'search' that contains web addresses with the form 'www.example.com' or 'example.com'. I am trying to use a link_to_function call with replace_html to replace the 'maincontent' div with an iframe tag using the value of 'search' in the current instance as the src for the tag. My current attempt is the very ugly code below. I'd be grateful for either of the following types of responses: How can I rewrite the concatenation string to work correctly? How can I get the same effect (replacing the current content of the "mainContent" div with an iframe tag using a different method? (I had to modify the code before to remove the < from the iframe) link_to_function h(search.title) do |page| page.replace_html 'mainContent', 'iframe id="embedded" src="http://" + #{search.search} />' end

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• Why is the value of __name__ changing after assignment to sys.modules[__name__]?

  - by martineau

  While trying to do something similar to what's in the ActiveState recipe titled Constants in Python by Alex Martelli, I ran into an unexpected side-effect that assigning a class instance to an entry in sys.modules apparently has in Python 2.7 -- namely that doing so apparent changes the value of __name__ to None as illustrated in the following code fragment: class _test(object): pass import sys print '__name__: %r' % __name__ # __name__: '__main__' sys.modules[__name__] = _test() print '__name__: %r' % __name__ # __name__: None if __name__ == '__main__': # never executes... import test print "done" I'd like to understand why this is happening. I don't believe it was that way in Python 2.6 and earlier versions since I have some older code where apparently the if __name__ == '__main__': conditional worked as expected following the assignment (but no longer does). FWIW, I also noticed that the name _class is getting rebound from a class object to None, too, after the assignment. Also seems odd to me that they're being rebound to 'None' rather than disappearing altogether... Update: I'd like to add that any workarounds for achieving the effect of if __name__ == '__main__':, given what happens would be greatly appreciated. TIA!

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• Android sql creating database once

  - by semajhan

  One thing i'm not understanding is how to create the database and data just once in an android application. I extend SQLiteOpenHelper and use a DataHelper class that to manipulate data. Now, I have addEvent() and updateEvent() within the DataHelper class. I create an instance of DataHelper in my Activity and addEvent() a couple of times to insert data. Well, now I don't know how to just do that once. If I restart the app, its just going to "addEvent()" again and so the data is being reset every time. Sorry for the probably really REALLY noob question. The only solution I found was not using the DataHelper class and just adding data "manually" within the onCreate() method in SQLiteOpenHelper.

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• "slash before every quote" problem

  - by Camran

  I have a php page which contains a form. Sometimes this page is submitted to itself (like when pics are uploaded). I wouldn't want users to have to fill in every field again and again, so I use this as a value of a text-input inside the form: value="<?php echo htmlentities(@$_POST['annonsera_headline'],ENT_COMPAT,'UTF-8');?>"> This works, except it adds a "\" sign before every double-quote... For instance writing 19" wheels gives after page is submitted to itself: 19\" wheels And if I don't even use htmlentities then everything after the quotes dissappears. What is the problem here?

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• How do you extend a Ruby module with macro-like metaprogramming methods?

  - by Ian Terrell

  Consider the following extension (the pattern popularized by several Rails plugins over the years): module Extension def self.included(recipient) recipient.extend ClassMethods recipient.class_eval { include InstanceMethods } end module ClassMethods def macro_method puts "Called macro_method within #{self.name}" end end module InstanceMethods def instance_method puts "Called instance_method within #{self.object_id}" end end end If you wished to expose this to every class, you can do the following: Object.send :include, Extension Now you can define any class and use the macro method: class FooClass macro_method end #=> Called macro_method within FooClass And instances can use the instance methods: FooClass.new.instance_method #=> Called instance_method within 2148182320 But even though Module.is_a?(Object), you cannot use the macro method in a module: module FooModule macro_method end #=> undefined local variable or method `macro_method' for FooModule:Module (NameError) This is true even if you explicitly include the original Extension into Module with Module.send(:include, Extension). How do you add macro like methods to Ruby modules?

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• t-sql getting leaf nodes

  - by stackoverflowuser

  Based on following table (I have kept spaces between the rows for clarity) Path ----------- \node1\node2\node3 \node1\node2\node3\node5 \node1\node6\node3 \node1\node4\node3 \node1\node4\node3\node7 \node1\node4\node3\node8 \node1\node4\node3\node9 \node1\node4\node3\node9\node10 I want to get all the paths containing leaf node. So for instance, following will be considered leaf nodes for path \node1\node4\node3 \node1\node4\node3\node7 \node1\node4\node3\node8 \node1\node4\node3\node9\node10 The following will be the output: Output --------------------------- \node1\node2\node3\node5 \node1\node6\node3 \node1\node4\node3\node7 \node1\node4\node3\node8 \node1\node4\node3\node9\node10 Pls. suggest. Thanks.

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