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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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  • Terracotta With Hibernate and EHCache

    - by Joe Biron
    Head swimming with the product name soup at http://www.terracotta.org. Need someone to help clarify what I need. Background: app has some "legacy" persistence code that does not use Hibernate, but has a home-grown cache implementation. New entities are Hibernate enabled. What I want: to use Terracotta for Hibernate 2nd level cache. I think I then want to slide out the home-grown cache impl and slide in ehcache (very similar semantically to home-grown version) - obviously I want Terracotta to back that EHCache as well. Confused with: Will I be telling Hibernate that ehcache is it's cache provider, then configure ehcache to use terracotta? So (hibernate | legacy-persistence)- ehcache - terracotta Am I on the right track? Forgive the newb question but the terracotta.org site really confuses me since so much of it it trying to sell me the commercial varieties.

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  • Closest Approach question for math/physics heads

    - by Kyle
    I'm using a Segment to Segment closest approach method which will output the closest distance between two segments of length. These objects are moving at variable speed each, so even when it succeeds I'm currently using a 10-step method and calculating the distance between 2 spheres as they move along the two segments. So, basically the length of each segment is the object's traverse in the physics step, and the radius is the objects radius. By stepping, I can tell where they collide, and if they collide (Sort of; for the MOST part.).. I get the feeling that there could be something better. While I sort of believe that the first closest approach call is required, I think that the method immediately following it is a TAD weak. Can anyone help me out? I can illustrate this if needed. Thanks alot!

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  • How does NHibernate handle cascade="all-delete-orphan"?

    - by Johannes Rudolph
    I've been digging around the NHibernate sources a little, trying to understand how NHibernate implements removing child elements from a collection. I think I've already found the answer, but I'd ideally like this to be confirmed by someone familiar with the matter. So far I've found AbstractPersistentCollection (base class for all collection proxies) has a static helper method called GetOrphans to find orphans by comparing the current collection with a snapshot. The existence of this method suggests NHibernate tries to find all oprhaned elements and then deletes them by key. Is this correct, in terms of the generated SQL?

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  • xcode/iphone Code templates

    - by vilo
    Is there some tool in xcode that allows me to store snippets of code I often reuse in various applications so I do not have to retype it each time? I am talking about things like all the code that goes into defining Table Delegate Methods and Table Source Methods, UIAlertViews code and such. I just would like to have my own private repository where I can put snippets of code I think I may need in the future in other apps. Is there anything like that? Thanks for any help.

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  • Why friend overloaded operator is preferred to conversion operator in this case

    - by skydoor
    Hi I have a code like this, I think both the friend overloaded operator and conversion operator have the similar function. However, why does the friend overloaded operator is called in this case? What's the rules? Thanks so much! class A{ double i; public: A(int i):i(i) {} operator double () const { cout<<"conversion operator"<<endl;return i;} // a conversion operator friend bool operator>(int i, A a); // a friend funcion of operator > }; bool operator>(int i, A a ){ cout<<"Friend"<<endl; return i>a.i; } int main() { A aa(1); if (0 > aa){ return 1; } }

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  • Configuration Files: how to read them into models?

    - by stacker
    I have a lot of configuration files in this format: <?xml version="1.0" encoding="utf-8"?> <XConfiguration> <XFile Name="file name 1" /> <XFile Name="name2" /> <XFile Name="name3" /> <XFile Name="name4" /> </XConfiguration> I want to use ConfigurationRepository.Get to get this object populated: public class XConfiguration { public XFile[] Files { get; set; } } I wonder what is the best way to do that. LinqToXml? I don't think ConfigurationManager is a smart option for this.

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  • Using Tkinter in python to edit the title bar

    - by Dan
    I am trying to add a custom title to a window but I am having troubles with it. I know my code isn't right but when I run it, it creates 2 windows instead, one with just the title tk and another bigger window with "Simple Prog". How do I make it so that the tk window has the title "Simple Prog" instead of having a new additional window. I dont think I'm suppose to have the Tk() part because when i have that in my complete code, there's an error from tkinter import Tk, Button, Frame, Entry, END class ABC(Frame): def __init__(self,parent=None): Frame.__init__(self,parent) self.parent = parent self.pack() ABC.make_widgets(self) def make_widgets(self): self.root = Tk() self.root.title("Simple Prog")

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  • Frustrated with Objective-c code...

    - by Moshe
    Well, I've started with iPod/iPhone programming using Head First iPhone Development (O'reilly) and I'm typing code out of the book. There are two problems, one is programming related and the other is not. I don't understand the format of objective-c methods. I'm getting an few errors now, based on source code from the book. Which leads me to my next issue. Some of the code is buggy. I think so because I couldn't get the code to run without modifying it. The book has some typos in the text since it's a first edition and whatnot, but could my "fixing" the code have to do with it? So... Where can I learn more about objective-c methods and how they work in terms of structure and where the return type and arguments go? For those with the book, I'm in the middle of the InstaTweet app towards the beginning. Thanks.

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  • error about django to connecct newes mssql2008

    - by qq263020776
    I am using django-mssql and SQL Server 2008, but I found that it always errors when I do some commands,for example: python manage.py syncdb the error is below: raise OperationalError(e, "Error opening connection: " + connection_string) ngo.db.backends.sqlserver_ado.dbapi.OperationalError: (com_error(-2147352567, xb7\xa2\xc9\xfa\xd2\xe2\xcd\xe2\xa1\xa3', (0, u'Microsoft OLE DB Provider for L Server', u'[DBNETLIB][ConnectionOpen (Connect()).]SQL Server \u4e0d \u5b58\u 8\u6216\u62d2\u7edd\u8bbf\u95ee\u3002', None, 0, -2147467259), None), 'Error ning connection: PROVIDER=SQLOLEDB;DATA SOURCE=115.238.106.100,60433;Network rary=DBMSSOCN;Initial Catalog=rvdb_1;UID=sa;PWD=xxxx') When I use Microsoft SQL Server Management studio client, I can successfully connect the database. I got some infomation from: http://code.google.com/p/django-mssql/issues/detail?id=76 but I still tried I got wrong and I think the solution provided is wrong.

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  • Is it good or bad practice to use var everywhere? [closed]

    - by Earlz
    Possible Duplicate: Use of var keyword in C# Hello, I've recently been discovering the awesomeness that is the var keyword in C#. Well, I didn't think about it before but I just wrote lines of code that are along the lines of var con=CreateNewConnection(); Where this would usually be IdbConnection con=CreateNewConnection(); Is this a good use of var? Is it possible to use var too often? Are there any downsides to using it? Also, one more point of consideration: We are not worried about backwards compatability. We just care that it runs on .NET 3.5

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  • Lua API for TokyoTyrant

    - by jideel
    Hi SO folks, I didn't managed to find an Lua client/api for TokyoTyrant. Such Api exists for TokyoCabinet, but not for TT. And Perl and Ruby API exists for TT. TT provides a native binary protocol, a memcached-compatible protocol, and an HTTP-oriented protocol. So my questions are : 1/ Do you think using the memcached (using luamemcached) or the HTTP protocol (using luaSocket) is "enough" for most / simple usage, and so a native Lua api is not necessary ? (the app is a simple uuid storage/distributor) ? 2/ Does it make sense to not use TokyoTyrant, but only TokyoCabinet, and use Lua at the application level to provide network and concurrent access to TC, using, say, Copas (Copas is , from their website, "a dispatcher based on coroutines that can be used by TCP/IP servers." ? Thanks.

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  • Moving a C# Program to a different language

    - by waiwai933
    I am currently in charge of the development of the second version of program that was created in Microsoft .NET C#. I'm not doing any actual programming, but I am writing the specification for the programmer. I'd like to take it off the .NET codebase, but since Joel said on his blog never to rewrite code, and he does provide good reasoning, I'm inclined to think carefully. So my question is, (1) Are there any easy ways to transition? (Languages like .NET C#) (2) Would you take it off .NET? (3) If so, what language would you use? The reason I want to take it off of .NET is as far as my understanding of .NET, it has to be installed on the client. I'd prefer not to inconvenience my customers when there's a better way.

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  • Is this a violation of the single responsiblity principle?

    - by L. Moser
    I have the following method and interface: public object ProcessRules(List<IRule> rules) { foreach(IRule rule in rules) { if(EvaluateExpression(rule.Exp) == true) return rule.Result; } //Some error handling here for not hitting any rules } public interface IRule { Expression Exp; Object Result; int Precedence; } Because rules have a precedence, they should actually never be processed out of order. This leads me with (I think) three solutions: Sort rules before passing them into the evaluator. Change the parameter type to something that enforces a sort order. Sort within the evaluator. I like option 3 because it always ensures that it is sorted and I like option 1 because it seems more cohesive. And option 2 seems like a good compromise. Is a scenario like this context specific/subjective, or is there really a best practice to be applied here?

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  • RockBand-like voice app for PC/OSX / Real time pitch display software

    - by Sai Emrys
    I played Rock Band 2 for the first time a little while ago (at Notacon). One thing I enjoyed about it was getting real-time feedback about my singing. I think it'd be neat to have something like that to run alongside my usual music, so that I can sing to random stuff in my music collection and know when I'm hitting the notes. Is there something like this for PC - ideally for OSX, and ideally that can just operate on arbitrary songs? I don't really care if it's game-like (though that's neat too); I just want it for the singing feedback. And I have no need for pitch correction - ideally what I'd see is just the pitches of the notes in the music and (on the same scale, differently displayed) of the live microphone. I tried to STFW but got no salient hits. :-/ Thanks!

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  • Neural Network problems

    - by Betamoo
    I am using an external library for Artificial Neural Networks in my project.. While testing the ANN, It gave me output of all NaN (not a number in C#) The ANN has 8 input , 5 hidden , 5 hidden , 2 output, and all activation layers are of Linear type , and it uses back-propagation, with learning rate 0.65 I used one testcase for training { -2.2, 1.3, 0.4, 0.5, 0.1, 5, 3, -5 } ,{ -0.3, 0.2 } for 1000 epoch And I tested it on { 0.2, -0.2, 5.3, 0.4, 0.5, 0, 35, 0.0 } which gave { NaN , NaN} Note: this is one example of many that produces same case... I am trying to discover whether it is a bug in the library, or an illogical configuration.. The reasons I could think of for illogical configuration: All layers should not be linear Can not have descending size layers, i.e 8-5-5-2 is bad.. Only one testcase ? Values must be in range [0,1] or [-1,1] Is any of the above reasons could be the cause of error, or there are some constraints/rules that I do not know in ANN designing..? Note: I am newbie in ANN

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  • Rails Authentication

    - by Oluf Nielsen
    Hey, i need some help with rails, again! Last it was about Authlogic.. Well I'm gone a bit backward since.. I mean, Authlogic isn't a Authentcate system i like.. So now i wan't you guys to tell me what you think is the best! I going to use it to a project of mine. Where there has to be a few roles like Admin, User and Guest.. So might you guys can tell me what is good and what is bad..?

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  • warning C6242: A jump out of this try-block forces local unwind

    - by Benjamin
    When we use SEH with __finally block, if we do return in __try block, it causes a local unwind. To Local unwind, the system need to approximately 1000 instructions. The local unwind causes a warning C6242. MSDN suggests using __leave keyword(with saving a return value). But I don't think it's a good idea. If we save a return value and leave the block, there will be many mistakes. Is the waring really necessary? What do you prefer?

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  • How can I force a major upgrade to not switch to maintenance mode using the old installation package

    - by Brian
    I have an installer that I would like to use for a major upgrade. I have done the following: Increased the version number (from a.b.c to a.b.c+1) Changed the ProductCode Kept the same UpgradeCode Made the appropriate entry in the Upgrade table Changed the component ID of an existing component Changed the name of the installer package Changed the PackageCode Basically I've done everything I can think of to force MSI to treat this as a major upgrade. However, when I attempt to install this new package, the installer log says "Product registered: entering maintenance mode" and proceeds to try to find the old installer file (which fails, since the new installer is in a different folder than was used for the original installation, and wasn't even what I wanted to happen). What am I missing? Why does the installer switch to maintenance mode right away rather than perform the major upgrade? Thanks!

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  • Storing index values in FAST-ESP without modifications

    - by Abel Morelos
    Hi, first of all I'm totally new to FAST but I already have a couple of issues I need to solve, so I'm sorry if my questions are very basic =) Well, the problem is that I have a field in the FAST index which in the source document is something like "ABC 12345" (please note the intentional whitespaces) but when stored in the index is in the form "ABC 123456" (please note that now there is a single space). If I retrieve all the document values then this specific value is OK (with all the whitespaces), my only problem is with the way the value is stored in the index since I need to retrieve and display it to my user just like it appears in the original document, and I don't want to go to the full document just for this value, I want the value that I already have in the index. I think I need to update one of the FAST XML configuration files but I don't have enough documentation at hand in order to decide where to perform the change, index_profile.xml? in the XMLMapper file?

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  • Searching for cluster computation framework

    - by petkov_d
    I have a library, written in C#, containing one method: Response CalculateSomething(Request); The execution time of this method is relatively large, and there are a lot of responses that should be processed. I want to use a "cluster", spread this DLL to different machines (nodes) in this "cluster" and write some controller that will distribute responses to the nodes. There should be mechanism that perevent losing task because of node crush, load balancing. Can someone suggest framework that addresses this issue? P.S. There is a framework Qizmt written in C# but I think MapReduce is not good for the above scenario

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  • Excanvas does not work in IE8 at all

    - by Matt Null
    I simply cannot get excanvas to work at all. I have tried everything I can think of. I am even uploading the examples that come with excanvas to my website and testing them and they do not even work. I don't know if it has something to do with my server or what, but I haven't seen a working excanvas image yet. for instance... I this example comes with the excanvas package and it does not work for me... does anyone know what this could possibly be? thanks http://www.javascriptkids.com/tools/excanvas/examples/example1.html

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  • Visual Studio add-in to quickly test a code snippet

    - by Matti Virkkunen
    One thing I really love about languages such as Python is that if you have a piece of code you'd like to try out, you can just open the interactive shell and do it in seconds. Is there a Visual Studio add-in that does the same for C#? Basically what I'm looking for is something that opens up a window or tab with a text editor (preferably with code completion, because VS does it so nicely) and a button that runs the code and displays the output. Extra points for convenience features such as displaying complex output in a user-friendly way (think Firebug's console.log), automatically referencing all the assemblies the current project references, etc. I tried googling for a while, but either I fail at coming up with good keywords, or no-one has made an add-in like this. If there really is none, I'm considering making one myself.

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  • mysql: how to set max_allowed_packet for shared hosting?

    - by Sadi
    Hello, I need to set (increase) max_allowed_packet. But the problem is I am using a shared hosting. So, I can not access the .ini or .cnf file. Also I can not use the SET command. How can I am able to set a value (actually increase) for the max_allowed_packet, without asking the hosting support. I have no SSH access there. EDIT: I am trying to use VB 4.0.3. In there the attachment size is limited by it. So, I do not think splitting the file can be an option in this case. Thank you Sadi

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  • Postgresql 8.4 reading OID style BLOBs with Hibernate

    - by peter
    I am getting this weird case when querying Postgres 8.4 for some records with Blobs (of type OIDs) with Hibernate. The query does return all right but when my code wants to read the content of the BLOB with the simple code below, it gets 0 bytes back public static byte[] readBlob(Blob blob) throws Exception { InputStream is = null; try { is = blob.getBinaryStream(); return org.apache.commons.io.IOUtils.toByteArray(is); } finally { if (is != null) try { is.close(); } catch(Exception e) {} } } Funny think is that I am getting this behavior only since I've started adding more then one such records to the table. The underlying JDBC library is type 3 (postgresq 8.4-701). Can someone give me a hint as to how to solve this issue? Thanks Peter

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