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• Can the opensocial API remotely search for users in orkut etc.?

  - by Martin

  Does anyone know if (and how) I can build an application (Java/Ruby/whatever) doing REST or RPC calls to a social network like Orkut (using opensocial) to search for a user by name or email address? So far I know that I can list all friends for a particular user ID, but I want to search among all users. Would I need to code it as an app/gadget running inside the google sandbox or is there a way to get a list of matching user ID via REST? So far I got this one to work: http://code.google.com/p/opensocial-ruby-client/wiki/GettingStarted. But with this API and the gadget linked there I only get people that are already linked to me... Thanks for answers, Martin

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• Python lazy property decorator

  - by detly

  Recently I've gone through an existing code base and refactored a lot of instance attributes to be lazy, ie. not be initialised in the constructor but only upon first read. These attributes do not change over the lifetime of the instance, but they're a real bottleneck to calculate that first time and only really accessed for special cases. I find myself typing the following snippet of code over and over again for various attributes across various classes: class testA(object): def __init__(self): self._a = None self._b = None @property def a(self): if self._a is None: # Calculate the attribute now self._a = 7 return self._a @property def b(self): #etc Is there an existing decorator to do this already in Python that I'm simply unaware of? Or, is there a reasonably simple way to define a decorator that does this? I'm working under Python 2.5, but 2.6 answers might still be interesting if they are significantly different.

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• file reading in python

  - by Jagdev

  So my whole problem is that I have two files one with following format(for Python 2.6): #comments config = { #comments 'name': 'hello', 'see?': 'world':'ABC',CLASS=3 } This file has number of sections like this. Second file has format: [23] [config] 'name'='abc' 'see?'= [23] Now the requirement is that I need to compare both files and generate file as: #comments config = { #comments 'name': 'abc', 'see?': 'world':'ABC',CLASS=3 } So the result file will contain the values from the first file, unless the value for same attribute is there in second file, which will overwrite the value. Now my problem is how to manipulate these files using Python. Thanks in advance and for your previous answers in short time ,I need to use python 2.6

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• Pear SOAP and XAMPP on Ubuntu

  - by Vincent

  All, I have installed xampp for linux on ubuntu 9.10. The installation directory is /opt/lampp. The xampp website says PEAR comes with the installation.. I am relatively new to PEAR and want to know the answers for following: Is PEAR installed with xampp or need to be installed separately using synaptic package manager? I browse to /opt/lampp/bin directory and see "pear" there, but when i type it in the command line, it says "The program 'pear' is currently not installed. You can install it by typing: sudo apt-get install php-pear pear: command not found " I want to use PEAR:SOAP package in my PHP code. How to use that? Do I need to set any paths to the pear in my php.ini? Thanks

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• Efficiently Determine if EF 4 POCO Already in ObjectSet

  - by Eric J.

  I'm trying EF 4 with POCO's on a small project for the first time. In my Repository implementation, I want to provide a method AddOrUpdate that will add a passed-in POCO to the repository if it's new, else do nothing (as the updated POCO will be saved when SaveChanges is called). My first thought was to do this: public void AddOrUpdate(Poco p) { if (!Ctx.Pocos.Contains<Poco>(p)) { Ctx.Pocos.AddObject(p); } } However that results in a NotSupportedException as documented under Referencing Non-Scalar Variables Not Supported (bonus question: why would that not be supported?) Just removing the Contains part and always calling AddObject results in an InvalidStateException: An object with the same key already exists in the ObjectStateManager. The existing object is in the Unchanged state. An object can only be added to the ObjectStateManager again if it is in the added state. So clearly EF 4 knows somewhere that this is a duplicate based on the key. What's a clean, efficient way for the Repository to update Pocos for either a new or pre-existing object when AddOrUpdate is called so that the subsequent call to SaveChanges() will do the right thing? I did consider carrying an isNew flag on the object itself, but I'm trying to take persistence ignorance as far as practical.

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• Data in two databases, eager spool resulting in query

  - by Valkyrie

  I have two databases in SQL2k5: one that holds a large amount of static data (SQL Database 1) (never updated but frequently inserted into) and one that holds relational data (SQL Database 2) related to the static data. They're separated mainly because of corporate guidelines and business requirements: assume for the following problem that combining them is not practical. There are places in SQLDB2 that PKs in SQLDB1 are referenced; triggers control the referential integrity, since cross-database relationships are troublesome in SQL Server. BUT, because of the large amount of data in SQLDB1, I'm getting eager spools on queries that join from the Id in SQLDB2 that references the data in SQLDB1. (With me so far? Maybe an example will help:) SELECT t.Id, t.Name, t2.Company FROM SQLDB1.table t INNER JOIN SQLDB2.table t2 ON t.Id = t2.FKId This query results in a eager spool that's 84% of the load of the query; the table in SQLDB1 has 35M rows, so it's completely choking this query. I can't create a view on the table in SQLDB1 and use that as my FK/index; it doesn't want me to create a constraint based on a view. Anyone have any idea how I can fix this huge bottleneck? (Short of putting the static data in the first db: believe me, I've argued that one until I'm blue in the face to no avail.) Thanks! valkyrie Edit: also can't create an indexed view because you can't put schemabinding on a view that references a table outside the database where the view resides. Dang it.

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• Best Practise for Stopwatch in multi processors machine?

  - by Ahmed Said

  I found a good question for measuring function performance, and the answers recommend to use Stopwatch as follows Stopwatch sw = new Stopwatch(); sw.Start(); //DoWork sw.Stop(); //take sw.Elapsed But is this valid if you are running under multi processors machine? the thread can be switched to another processor, can it? Also the same thing should be in Enviroment.TickCount. If the answer is yes should I wrap my code inside BeginThreadAffinity as follows Thread.BeginThreadAffinity(); Stopwatch sw = new Stopwatch(); sw.Start(); //DoWork sw.Stop(); //take sw.Elapsed Thread.EndThreadAffinity(); P.S The switching can occur over the thread level not only the processor level, for example if the function is running in another thread so the system can switch it to another processor, if that happens, will the Stopwatch be valid after this switching? I am not using Stopwatch for perfromance measurement only but also to simulate timer function using Thread.Sleep (to prevent call overlapping)

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• WPF: Problem with SelectedItem for ComboBox

  - by Anry

  XAML: <ComboBox Height="27" Margin="124,0,30,116" Name="cbProductDefaultVatRate" VerticalAlignment="Bottom" ItemsSource="{Binding}"> <ComboBox.ItemTemplate> <DataTemplate> <Label Height="26" Content="{Binding Path=Value}"/> </DataTemplate> </ComboBox.ItemTemplate> </ComboBox> Set Data for cbProductDefaultVatRate.Items (Type - VatRate): private void ShowAllVatRates() { cbProductDefaultVatRate.Items.Clear(); cbProductDefaultVatRate.ItemsSource = new VatRateRepository().GetAll(); } Similarly, I defined property: private Product SelectedProduct { get; set; } The Product contains VatRate: SelectedProduct.DefaultVatRate How to set SelectedItem equal SelectedProduct.DefaultVatRate? I tried: cbProductDefaultVatRate.SelectedItem = SelectedProduct.DefaultVatRate; But it does not work. Thank you for answers!

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• Career as a Software Tester

  - by mgj

  Respected all, I am a fresher who is interested in a job as a software tester. I had few general queries regarding the prospects of this kind of a job in a software company. What are the kind of challenges that a tester faces in real life situations that make his/her job more interesting and self-motivating? What are the growth opportunities for an individual in a software company who wants to pursue a career as a software tester? Are software developers and software testers treated alike in terms of growth opportunities or otherwise? If not so why? How does one(software tester or any one else) deal with such situation such that its a win win situation for both the company and the software tester? I am really looking forward to the answers that you can give from your personal experiences and insights. Thank you..:)

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• Best practice No1: inline search layout across browsers

  - by Sixfoot Studio

  Ok, I have managed to fix my version of this example using a multitude of hacks and I would like to see how others would tackle this problem making this cross-browser compatible without too many hacks. <div class="searchDiv"> <img src="Images/left.gif" class="left" height="19" width="3" /> <input id="TextBox" type="text" class="searchField" /> <img src="Images/right.gif" height="19"width="3" class="right" /> <a href="" class="submit">Submit</a> <img src="Images/box-arrow.gif" class="linkArrow" width="8" height="14" /> </div> I am using a Transitional DTD in my example. Based on the everyone else's CSS examples, comments and answers I will make the final vote. I'd love to see more of these scenarios come up so that people have a library of "best practice" methods which they can find on SO. Good luck

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• Circular dependecy in winforms app using Castle Windsor

  - by Sven

  Hello, I was experimenting a little bit with Castle winforms in a winforms project. I wanted to register all my form dependencies with Castle windsor. This way I would have a single instance for all my forms. Now I have some problem though. I'm in a situation that form x has a dependency on form y and form y has a dependency on form x. Practical example maybe: form x is used to create an order, form y is the screen that has a list of customers. From form x there is a button to select a customer for the order. This will open form y where ou can search the customer. There is a button that lets you add the found customer to the order. It will call a method on form x and passes the selected customer object. I could do this with events. Raise an event in form y and listen for that in form x. But isn't there a way around the circular dependency in Castle Windsor, lazy registration or something? Can anyone help me out? Thanks in advance

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• Add new row: ListView vs. DataGrid

  - by Shimmy

  Hello! I have been looking around and even found a couple of related answers and didn't get a certain answer to my question. Is there a way to have in the WPF ListView an additional row like in a DataGrid? I prefer using the ListView since I use 3.5 and the DataGrid is not officially in the box and has many quirks. I would prefer using the ListView if there is an official option to add new rows or else I use the DataGrid. Thanks a lot.

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• Convert a user's search string into a MS SQL `Full-Text Query` Search Phrase

  - by Atomiton

  I've search for answers for this and I can't seem to find an answer to what should be somewhat simple. This is related to another question I asked, but it's different. What's the best way to take a user's search phrase and throw it into a CONTAINSTABLE(table, column, @phrase, topN ) phrase? Say, for example the user inputs: Books by "Dr. Seuss" What's the best way to turn that into something that will return results in my ContainsTAble() phrase? I was previously parsing the search phrase and writing something like ISABOUT("Books" WEIGHT(1.0), "by" WEIGHT(0.9), "Dr. Seuss" WEIGHT(0.8)) as my @phrase but ISABOUT seems to be returning odd results... especially when one word searches are entered. Any Ideas?

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• How to differentiate document requests from variable requests? and how to allow for urls that are no

  - by Lucas

  Hello. My last post was met by smarmy, unhelpful "answers" (comments), so i'll get right to it: if I have an htaccess file like so: RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}\.php -f RewriteRule ^(.*)$ $1.php RewriteCond %{REQUEST_FILENAME} -f RewriteRule ^ - [L] RewriteRule ^([^/]+)/([^/]+)$ /index.php?page=$1&subject=$2 RewriteRule ^([^/]+)$ /index.php?page=$1 [L] how can I allow for other url variable names and values to be handled... say for instance I want to add extra unexpected url vars to this scenario /page/subject?urlvar1=value1&urlvar2=value2 and get the page I want without creating unexpected results? Any real help is greatly appreciated. Thanks!

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• Best practices for TDD BDD with code that uses external services / api

  - by adam

  I'm using a twitter gem which basically accesses twitter and lets me grab tweets, timeline etc. Its really good but I have a lot of my code that uses the stuff it returns and I need to test it. The things the gem returns aren't exactly simple strings, there pretty complex objects (scary as well) so im left scratching my head. So basically I'm looking for an answer, book, blog, open-source project that can show me the rights and wrongs of testing around external services. answers that are either not language centric or ruby/rails centric would most greatly be appreciated.

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• htaccess: how to differentiate document requests from variable requests? ... also, how to allow for

  - by Lucas

  hello, my last post was met by smarmy, unhelpful "answers" (comments), so i'll get right to it: if i have and htaccess file like so: RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-d RewriteCond %{REQUEST_FILENAME}.php -f RewriteRule ^(.*)$ $1.php RewriteCond %{REQUEST_FILENAME} -f RewriteRule ^ - [L] RewriteRule ^([^/]+)/([^/]+)$ /index.php?page=$1&subject=$2 RewriteRule ^([^/]+)$ /index.php?page=$1 [L] how can i allow for other url variable names and values to be handled... say for instance i want to add extra unexpected url vars to this scenario /page/subject?urlvar1=value1&urlvar2=value2 and get the page i want without creating unexpected results? any real help is greatly appreciated. thanks!

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• store everything only once, smarter

  - by hsmit

  In the digital world a lot is stored multiple times. As a thought experiment or creative challenge I want you to think about making this more efficient and maybe reuse more. Think of the following cases: an mp3 track is downloaded multiple times, copied over various devices on website a login form is often rebuild many times, why not reuse more code? words themselves are used many times questions and answers are accidentally saved at many places in parallel images or photos often describe the same data (Eiffel tower, Golden gate, Taj Mahal) etc etc Are you aware of solutions? Or are you thinking about similar topics? Ideas? Blueprints? I'd love to hear from you!

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• What is a NullReferenceException in .NET?

  - by John Saunders

  (I'm creating this separate question and answer because every question we get on NullReferenceException is really the same) I have some code and when it executes, it throws a NullReferenceException, saying, "Object reference not set to an instance of an object.". What does this mean, and what can I do about it? Note again, that this is a question meant to focus answers to the canonical "what is a NullReferenceException and why did I get one" question. I do know what a NullReferenceException is, as my answer below demonstrates.

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• How to format a money value from an ISOCurrencySymbol in C#

  - by nareshbhatia

  I have created a Money class to save money values in different currencies. The class uses 3 letter ISO symbols to store currency types: public class Money { public decimal Amount { get; set; } public string Currency { get; set; } } Is there a way in C# to use this information, say 100.00 USD, and format it as "$100.00"? Only way I know of requires CultureInfo like this: Amount.ToString("C", CultureInfo.CreateSpecificCulture("en-US")); However this does not work with my Money class. Is there another solution? I am open to changing my Money class. I have searched this site for similar questions (such as this), but couldn't find one that answers the above question.

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• IRb: how to start an interactive ruby session with pre-loaded classes

  - by Shyam

  Hi, As I am going through my journey by adopting the Ruby language, I spend a lot of time inside IRb. It's just fantastic! But, as I am not very aware of it's capabilities, and still a nuby with Ruby, I would like to know the following: How can I 'flush' the session, without restarting IRb (or is this not possible). How can I configure IRb to load a bunch of source files "hello.rb" and "hello_objects.rb", i.e. at startup? I am heavily working in these and it would be nice to know a short hand to load these classes, without manually typing 'load' for each again. Thank you for your answers, comments and feedback!

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• Passing data with Rails' link_to helper

  - by mathee

  I am implementing a question-and-answer application with Ruby on Rails. I have MVCs for Questions and Answers. In the home view (index.haml), I list the Questions like this: - @questions.each do |q| %tr %td =link_to q.title, q Next to each of those, I want to add a link that will create a new Answer and pass the id of the Question in that row (continued from the above Haml code) : %td #{link_to 'answer me!', new_answer_path, pass q.id here somehow?} I don't know how to properly pass it and then access it in AnswersController. I tried #{link_to 'answer me!', new_answer_path, :question_id => q.id}, but that was just a guess, and I don't know how to access that in AnswersController. I read the Rails API docs, and I know you can add query, too, but I still don't know how to access the value in AnswersController.

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• Access Git Repository using Eclipse and Netbeans Plugins with LDAP Users

  - by ukrania

  Hello everyone! I've configure a git server. I need to use ssh because I've defined permissions using users of my domain, using LDAP. Only users with permissions could read a project. So, the links to access my repositories are like that: ssh://[email protected]@hostname/var/git/repo.git When I clone, commit or push a project using linux git commands or using tortoisegit on windows, there is no problem, everything works as expected. However, I've tried to clone a project using plugins from Eclipse (EGit) and Netbeans (NBGit), with no success. Seems that they can't recognize the host. I've accessed using a user from the server (not from the domain) and it cloned the project perfectly. Seems that the plugins assume that the host is everything after the first @. Do you know how I can solve this problem? There are any other Git plugins for those IDEs? Thanks for your answers. Best Regards, ukrania

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• Map large integer to a phrase

  - by Alexander Gladysh

  I have a large and "unique" integer (actually a SHA1 hash). I want (for no other reason than to have fun) to find an algorithm to convert that SHA1 hash to a (pseudo-)English phrase. The conversion should be reversible (i.e., knowing the algorithm, one must be able to convert the phrase back to SHA1 hash.) The possible usage of the generated phrase: the human readable version of Git commit ID, like a motto for a given program version (which is built from that commit). (As I said, this is "for fun". I don't claim that this is very practical — or be much more readable than the SHA1 itself.) A better algorithm would produce shorter, more natural-looking, more unique phrases. The phrase need not make sense. I would even settle for a whole paragraph of nonsense. (Though quality — englishness — of a paragraph should probably be better than for a mere phrase.) A variation: it is OK if I will be able to work only with a part of hash. Say, first six digits is OK. Possible approach: In the past I've attempted to build a probability table (of words), and generate phrases as Markov chains, seeding the generator (picking branches from probability tree), according to the bits I read from the SHA. This was not very successful, the resulting phrases were too long and ugly. I'm not sure if this was a bug, or the general flaw in the algorithm, since I had to abandon it early enough. Now I'm thinking about attempting to solve the problem once again. Any advice on how to approach this? Do you think Markov chain approach can work here? Something else?

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• Possible to Inspect Innards of Core C# Functionality

  - by Nick Babcock

  I was struck today, with the inclination to compare the innards of Buffer.BlockCopy and Array.CopyTo. I am curious to see if Array.CopyTo called Buffer.BlockCopy behind the scenes. There is no practical purpose behind this, I just want to further my understanding of the C# language and how it is implemented. Don't jump the gun and accuse me of micro-optimization, but you can accuse me of being curious! When I ran ILasm on mscorlib.dll I received this for Array.CopyTo .method public hidebysig newslot virtual final instance void CopyTo(class System.Array 'array', int32 index) cil managed { // Code size 0 (0x0) } // end of method Array::CopyTo and this for Buffer.BlockCopy .method public hidebysig static void BlockCopy(class System.Array src, int32 srcOffset, class System.Array dst, int32 dstOffset, int32 count) cil managed internalcall { .custom instance void System.Security.SecuritySafeCriticalAttribute::.ctor() = ( 01 00 00 00 ) } // end of method Buffer::BlockCopy Which, frankly, baffles me. I've never run ILasm on a dll/exe I didn't create. Does this mean that I won't be able to see how these functions are implemented? Searching around only revealed a stackoverflow question, which Marc Gravell said [Buffer.BlockCopy] is basically a wrapper over a raw mem-copy While insightful, it doesn't answer my question if Array.CopyTo calls Buffer.BlockCopy. I'm specifically interested in if I'm able to see how these two functions are implemented, and if I had future questions about the internals of C#, if it is possible for me to investigate it. Or am I out of luck?

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• accepts_nested_attributes_for and has_many :through relations.

  - by antiarchitect

  I want to make a simple examing application on RoR 2.3. The problem area is to make an exam_session in a one form with only one submit action. For the exam session there are selected some number of questions from the question pool in random order. For these questions there are selected some number of alternatives (to check is this a single answer question or multi answer question I use the number of correct alternatives: if only 1 - single, 1 - multi. Radiobuttons or checkboxes in form to answer depends on it). I have models: Questions ---< Alternative and ExamSession. I think there must be has_many :through relations between ExamSession and Questions and has_many :through relation between the intermediate table (for example QuestionsExamSession) and Alternative to point what alternatives are answers of the student on this Question. So the questions are: Is this scheme is too complicated and there is a way to do it simple and clear? Is there any way to organize models in such a way to make the form I want to work?

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