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  • Learning functional/clojure programming - practical excersises?

    - by Konrad Garus
    I'm learning functional programming with Clojure. What practical excersises can you recommend? Online repositories with solutions would be perfect. One idea I can think of is going through all the popular algorithms on sorting, trees, graphs etc. and implementing them in Clojure myself. While it could work, it may be pretty steep and I'm likely to do it inefficiently (compared to someone who knows what she's doing).

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  • Is opening too many datacontexts bad?

    - by ryudice
    I've been checking my application with linq 2 sql profiler, and I noticed that it opens a lot of datacontexts, most of them are opened by the linq datasource I used, since my repositories use only the instance stored in Request.Items, is it bad to open too many datacontext? and how can I make my linqdatasource to use the datacontext that I store in Request.Items for the duration of the request? thanks for any help!

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  • How to perform add/update of a model object that contains EntitySet

    - by David Liddle
    I have a similar concept to the SO questions/tags scenario however am trying to decide the best way of implementation. Tables Questions, QuestionTags and Tags Questions QuestionTags Tags --------- ------------ ---- QID QID TID QName TID TName When adding/updating a question I have 2 textboxes. The important part is a single textbox that allows users to enter in multiple Tags separated by spaces. I am using Linq2Sql so the Questions model has an EntitySet of QuestionTags with then link to Tags. My question is regarding the adding/updating of Questions (part 1), and also how to best show QuestionTags for a Question (part 2). Part 1 Before performing an add/update, my service layer needs to deal with 3 scenarios before passing to their respective repositories. Insert Tags that do not already exist Insert/Update Question Insert QuestionTags - when updating need to remove existing QuestionTags Here is my code below however started to get into a bit of a muddle. I've created extension methods on my repositories to get Tags WithNames etc. public void Add(Question q, string tags) { var tagList = tags.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries).ToList(); using (DB.TransactionScope ts = new DB.TransactionScope()) { var existingTags = TagsRepository.Get() .WithName(tagList) .ToList(); var newTags = (from t in tagList select new Tag { TName = t }).Except(existingTags, new TagsComparer()).ToList(); TagsRepository.Add(newTags); //need to insert QuestionTags QuestionsRepository.Add(q); ts.Complete(); } } Part 2 My second question is, when displaying a list of Questions how is it best to show their QuestionTags? For example, I have an Index view that shows a list of Questions in a table. One of the columns shows an image and when the user hovers over it shows the list of Tags. My current implementation is to create a custom ViewModel and show a List of QuestionIndexViewModel in the View. QuestionIndexViewModel { Question Question { get; set; } string Tags { get; set; } } However, this seems a bit clumsy and quite a few DB calls. public ViewResult Index() { var model= new List<QuestionIndexViewModel>(); //make a call to get a list of questions //foreach question make a call to get their QuestionTags, //to be able to get their Tag names and then join them //to form a single string. return View(model); } Also, just for test purposes using SQL Profiler, I decided to iterate through the QuestionTags entity set of a Question in my ViewModel however nothing was picked up in Profiler? What would be the reason for this?

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  • Bundle package everything

    - by AlexT
    Hello all. I want pack not installed gems but also which fetched from repositories, for example: I want pack paperclip which declared in Gemfile: gem 'paperclip', :git => 'git://github.com/thoughtbot/paperclip.git', :branch => 'rails3' Thanks

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  • NHibernate + Sql Compact + IoC - Connection Managment

    - by Michael
    When working with NHibernate and Sql Compact in a Windows Form application I am wondering what is the best practice for managing connections. With SQL CE I have read that you should keep your connection open vs closing it as one would typically do with standard SQL. If that is the case and your using a IoC, would you make your repositories lifetime be singletons so they exist forever or dispose of them after you perform a "Unit of Work". Also is there a way to determine the number of connections open to Sql CE?

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  • Converting from Mercurial to Subversion

    - by Matt Joiner
    Due to lack of Mercurial support in several tools, and managerial oppression it has become necessary to convert several trial Mercurial repositories to Subversion in order to conform with the company standard. Are there any tools or suggestions for how to achieve this without a loss of revision history and the like?

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  • Drupal development workflow for teams

    - by Raul Singahn
    In my last Drupal project we were 5 people doing coding and installing new modules, at the same type our client was putting up content. Since we chose to have only one server for simplicity there were times were many people needed to write to the same files like style.css or page.tpl.php or when someones broken code would prevent others from working Are there any best practises for a team that works with Drupal? How can leverage code repositories or sandboxes?

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  • What's the best way to replace remote.origin.url in Git?

    - by suzukimilanpaak
    I'm new to Git. Let's say Alice and Bob had been developing their project by using two Git repositories for each. And, Alice at certain times want to set up a new repository to manage their common progress. Do you think what is the best way to replace remote.origin.url in the configuration of Git? to replace by git config --replace to create new repos by git clone MAIN_REPOS or any?

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  • How to break connection between a clone repository and its parent

    - by nc97217
    I have some (local) repositories, an original and some clones. The original repository has been corrupted so I'd like to get rid of it and use one of the clones as the master for future development. Is there a better way to break the connection between the new master and the original repository than simply deleting the default entry in the [paths] section of that clone's hgrc? Similarly, in the other clones, can I simply change the default entry in their hgrc files' [paths] section to point to the new master repository?

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  • Where can I find the source code for log4j's ZeroConfSocketHubAppender?

    - by urig
    I'm looking for a way to make log4net support zeroconf to publish logs to Apache Chainsaw (see here: http://stackoverflow.com/questions/2843238/does-log4net-support-zeroconf). Apparently log4j can already do this using a ZeroConfSocketHubAppender. Where might I be able to view the source for the java ZeroConfSocketHubAppender? I've looked both in the Apache Chainsaw and in the Log4j repositories but was unsuccessful.

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  • How do I get changes to propagate to all subrepos in Mercurial?

    - by CoreyD
    I have recently switched from Subversion to Mercurial for source control and in doing so have split up one repository into several. I used subrepos to manage the dependencies between repositories. The problem is that pull is not suprepo aware so I have to go into each subrepo and pull changes in order to update a repository. Is there a better way to do this?

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  • Mercurial & Windows Server 2003

    - by tjsimmons
    Hi all, I just set up Mercurial on our main webserver, hosting repositories via hgwebdir.cgi. The problem I'm having now is when I run hg push from my local machine to the server's repository, it takes an absolutely ridiculous amount of time to push a very small directory, with only a single changeset. Is it possible that I've set something up wrong? I keep getting HTTP Error 502: Bad Gateway. Thanks!

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  • Mercurial Workflow for small team

    - by Tarski
    I'm working in a team of 3 developers and we have recently switched from CVS to Mercurial. We are using Mercurial by having local repositories on each of our workstations and pulling/pushing to a development server. I'm not sure this is the best workflow, as it is easy to forget to Push after a Commit, and 3 way merge conflicts can cause a real headache. Is there a better workflow we could use, as I think the complexity of distributed VC is outweighing the benefits at the moment. Thanks

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  • How to reflect over T to build an expression tree for a query?

    - by Alex
    Hi all, I'm trying to build a generic class to work with entities from EF. This class talks to repositories, but it's this class that creates the expressions sent to the repositories. Anyway, I'm just trying to implement one virtual method that will act as a base for common querying. Specifically, it will accept a an int and it only needs to perform a query over the primary key of the entity in question. I've been screwing around with it and I've built a reflection which may or may not work. I say that because I get a NotSupportedException with a message of LINQ to Entities does not recognize the method 'System.Object GetValue(System.Object, System.Object[])' method, and this method cannot be translated into a store expression. So then I tried another approach and it produced the same exception but with the error of The LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities. I know it's because EF will not parse the expression the way L2S will. Anyway, I'm hopping someone with a bit more experience can point me into the right direction on this. I'm posting the entire class with both attempts I've made. public class Provider<T> where T : class { protected readonly Repository<T> Repository = null; private readonly string TEntityName = typeof(T).Name; [Inject] public Provider( Repository<T> Repository) { this.Repository = Repository; } public virtual void Add( T TEntity) { this.Repository.Insert(TEntity); } public virtual T Get( int PrimaryKey) { // The LINQ expression node type 'ArrayIndex' is not supported in // LINQ to Entities. return this.Repository.Select( t => (((int)(t as EntityObject).EntityKey.EntityKeyValues[0].Value) == PrimaryKey)).Single(); // LINQ to Entities does not recognize the method // 'System.Object GetValue(System.Object, System.Object[])' method, // and this method cannot be translated into a store expression. return this.Repository.Select( t => (((int)t.GetType().GetProperties().Single( p => (p.Name == (this.TEntityName + "Id"))).GetValue(t, null)) == PrimaryKey)).Single(); } public virtual IList<T> GetAll() { return this.Repository.Select().ToList(); } protected virtual void Save() { this.Repository.Update(); } }

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  • Sharing the same file between different projects

    - by selsine
    Hi Everyone, For version control we currently use Visual Source Safe and are thinking of migrating to another version control system (SVN, Mercurial, Git). Currently we use Visual Source Safe's "Shared" file feature quite heavily. This allows us to share code between design and runtimes of a single product, and between multiple products as well. For example: **Product One** - Design Login.cpp Login.h Helper.cpp Helper.h - Runtime Login.cpp Login.h Helper.cpp Helper.h **Product Two** - Design Login.cpp Login.h - Launcher Login.cpp Login.h - Runtime Login.cpp Login.h In this example Login.cpp and Login.h contain common code that all of our projects need, Helper.cpp and Helper.h is only used in Product One. In Visual Source Safe they are shared between the specific projects, which means that whenever the files are updated in one project they are updated in any project they are shared with. This is a simple example but hopefully it explains why we use the shared feature: to reduce the amount of duplicated code and ensure that when a bug is fixed all projects automatically have access to the new fixed code. After researching alternatives to Visual Source Safe it seems that most version control systems do not have the idea of shared files, instead they seem to use the idea of sub repositories. (http://mercurial.selenic.com/wiki/subrepos http://svnbook.red-bean.com/en/1.0/ch07s03.html) My question (after all of that) is about what the best practices for achieving this are using other version control systems? Should we restructure our projects so that two copies of the files do not exist and an include directory is used instead? e.g. Product One Design Login.cpp Login.h Runtime Login.cpp Login.h Common Helper.cpp Helper.h This still leaves what to do with Login.cpp and Logon.h Should the shared files be moved to their own repository and then compiled into a lib or dll? This would make bug fixing more time consuming as the lib projects would have to be edited and then rebuilt. Should we use externals or sub repositories? Should we combine our projects (i.e. runtime, design, and launcher) into one large project? Any help would be appreciated. We have the feeling that our project design has evolved based on the tools that we used and now that we are thinking of switching tools it's difficult for us to see how we can best modify our practices. Or maybe we are the only people are there doing this...? Also, we use Visual Studio for all of our stuff. Thanks.

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  • How to move a Mercurial repository created on a local PC to a web server?

    - by Tim Murphy
    I have created and committed to Mercurial repository that was created on my local drive. I now have a remote Windows 2003 web server setup to serve repositories via hgwebdir.cgi. How do I move the locally created repository to the web server? It looks like an ftp of the .hg folder on the local drive to the remote web server does the trick. Am I doing it the right way. Is there a more efficient way?

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  • Where on the server are the svn folders I checked in?

    - by johnny
    Trying to understand something. I created a d:\svn\repository on my server. I committed folders but when I go back to d:\svn\repository I do not see them. Are they all in a database? Will all my repositories go in that main folder and svn tracks them? What if I have two projects? Thank you.

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