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• Ruby on Rails protect_from_forgery best practice

  - by randombits

  I'm currently working on building a RESTful web api with ruby on rails. I haven't bothered putting a proper authentication scheme into the API yet as I'm ensuring that tests and the basic behavior of the API is working all locally first. Upon testing non-HTTP GET type requests such as HTTP POST/DELETE/PUT, stuff chokes because protect_from_forgery is on by default. How does this work when I'm working in practice since essentially the idea is in a RESTful API that there is no state. The client does not have a session or a cookie associated with the server. Each request is an atomic, self-executed request. The user will supply some credentials to ensure they are who they say they are, but other than that, does protect_from_forgery make sense at this point? Should it remain enabled?

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• PlayDependencyClassLoader does not find application code

  - by jkschneider

  When a third party dependency attempts to load a class defined in a Play application using Class.forName(className, true, Thread.currentThread().getContextClassLoader()); Play will throw a ClassNotFoundException because the context class loader is of type PlayDependencyClassLoader which apparently only contains classes defined in jar dependencies. Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: eventstore.Commit at org.mapdb.SerializerPojo.classForName(SerializerPojo.java:96) at org.mapdb.SerializerPojo$1.deserialize(SerializerPojo.java:74) at org.mapdb.SerializerPojo$1.deserialize(SerializerPojo.java:39) This only occurs when Play is started with play run. Starting Play with play start loads the class correctly. It would be a shame to sacrifice the class hot-swapping because of this behavior. Is there a known workaround?

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• Can a ScatterViewItem dynamically resize to fit its content?

  - by Brett

  We're hosting a control inside of a ScatterViewItem that dynamically changes its size at runtime as a result of having various sub-elements added, removed, and/or collapsed. We would like to have the hosting ScatterViewItem resize as well to properly fit its child controls, but we're having a hard time making this happen. We've tried a number of different things and the closest we've come is hooking into the child control's SizeChanged event and explicitly setting the ScatterViewItem's Width and Height, but this approach still has issues. When you define a ScatterViewItem and its content in XAML, the ScatterViewItem is sized appropriately. We would like to force the same behavior at runtime when its content changes size. Any help would be greatly appreciated. Thanks!

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• Multiple rows with a single INSERT in SQLServer 2008

  - by Todd

  I am testing the speed of inserting multiple rows with a single INSERT statement. For example: INSERT INTO [MyTable] VALUES (5, 'dog'), (6, 'cat'), (3, 'fish) This is very fast until I pass 50 rows on a single statement, then the speed drops significantly. Inserting 10000 rows with batches of 50 take 0.9 seconds. Inserting 10000 rows with batches of 51 take 5.7 seconds. My question has two parts: Why is there such a hard performance drop at 50? Can I rely on this behavior and code my application to never send batches larger than 50? My tests were done in c++ and ADO.

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• elegant way to make directory recursively in Python?

  - by user248237

  I would like to make a directory in a "recursive" way, i.e. have a function make_directory() that behaves as follows: make_directory("a/b/c/d/") should create directory a, then child b, then c, then d. If any of the parent directories exist it should not make them. E.g. if "a" exists, then b should be a subdir of that, and then c should be made inside b, etc. how can I do this in python? os.mkdir does not have this behavior.

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• struts2 StringLengthFieldValidator annotation not working for empty string

  - by dcp

  Let's say I have this annotation for a struts2 validation: @StringLengthFieldValidator(key = "key14", fieldName = "poNumber", minLength = "1", maxLength = "255", message = "poNumber must be between 1 and 255 characters.") public void setPoNumber(String poNumber) { this.poNumber = poNumber; } The behavior I'm seeing is that if I pass a string that is empty to this setter, (ex. setPoNumber("")) the validator doesn't catch the error. Strings that are over 255 are caught fine. Equally strange is if I change minLength to 2 and pass a string of length 1, it will catch the error as well. But empty string does not seem to be caught when minLength = "1". For this reason, I cannot use this validator. I just wondered if I'm doing something wrong. I'm using struts 2.1.8.1. Thanks for any advice.

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• Hierarchical data in Linq - options and performance

  - by Anthony

  I have some hierarchical data - each entry has an id and a (nullable) parent entry id. I want to retrieve all entries in the tree under a given entry. This is in a SQL Server 2005 database. I am querying it with LINQ to SQL in C# 3.5. LINQ to SQL does not support Common Table Expressions directly. My choices are to assemble the data in code with several LINQ queries, or to make a view on the database that surfaces a CTE. Which option (or another option) do you think will perform better when data volumes get large? Is SQL Server 2008's HierarchyId type supported in Linq to SQL?

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• How to call a wpf singleton service within a wpf singleton service without hanging?

  - by Michael Hedgpeth

  I have two services, one that calls another. Both are marked as singletons as follows: [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Multiple)] public class Service : IService And I set these up with a ServiceHost as follows: ServiceHost serviceHost = new ServiceHost(singletonElement); serviceHost.Open(); When the parent service tries to call the child service on the same machine, the parent service hangs, waiting for the child service. I'm already considering moving away from the singleton model, but is there anything wrong with my approach? Is there an explanation for this behavior and a way out of it?

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• git: 'log master..origin/master' not behaving as expected

  - by steve jaffe

  I'm trying to compare my copy of 'master' to that on the remote repository which it tracks. I thought that the following command would work, and often it seems to. However, sometimes it produces nothing and yet I know that the remote branch has many changes, which I can confirm by doing a pull. git log master..origin/master Can anyone explain this behavior and tell me what command I should be using to determine the changes between local and remote? [Another piece of data: I've had it happen that 'git log master..origin/master' produces nothing. Then I do a pull. The pull fails because I have a working copy of some file. After this, 'git log master..origin/master' does show me the differences. It seems the pull has updated some local log? If so, how could I achieve this without doing (or attempting to do) a pull?]

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• Changing view size when orientation changes

  - by Eyal Redler

  I want my UIView subclass to behave so that when it is fitted in portrait orientation is has a certain size and another size when fitted in landscape mode. Is it possible to have the view indicate to the view controller that's resizing it when the orientation changes that it has this "ideal size"? To clarify, I'm confident that this is not something that can be done with the autoresizing mask. I also thought that sizeThatFits: would be what I need but I didn't see it get called when the orientation changed. I'm also aware that I can get this done by overriding layoutSubviews of the superview (or maybe some other method of the view controller but I would like to have this behavior embedded in the view to facilitate reuse.

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• java: decoding URI query string

  - by Jason S

  I need to decode a URI that contains a query string; expected input/output behavior is something like the following: abstract class URIParser { /** example input: * something?alias=pos&FirstName=Foo+A%26B%3DC&LastName=Bar */ URIParser(String input) { ... } /** should return "something" for the example input */ public String getPath(); /** should return a map * {alias: "pos", FirstName: "Foo+A&B=C", LastName: "Bar"} */ public Map<String,String> getQuery(); } I've tried using java.net.URI, but it seems to decode the query string so in the above example I'm left with "alias=pos&FirstName=Foo+A&B=C&LastName=Bar" so there is ambiguity whether a "&" is a query separator or is a character in a query component. edit: just tried URI.getRawQuery() and it doesn't do the encoding, so I can split the query string with a "&", but then what do I do? Any suggestions?

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• Recursive mocking with Rhino-Mocks

  - by jaspernygaard

  Hi I'm trying to unittest several MVP implementations and can't quite figure out the best way to mock the view. I'll try to boil it down. The view IView consists e.g. of a property of type IControl. interface IView { IControl Control1 { get; } IControl Control2 { get; } } interface IControl { bool Enabled { get; set; } object Value { get; set; } } My question is whether there's a simple way to setup the property behavior for Enabled and Value on the IControl interface members on the IView interface - like recursive mocking a guess. I would rather not setup expectations for all my properties on the view (quite a few on each view). Thanks in advance

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• Wpf: Tips for better performance

  - by viky

  I am working on a wpf application. In which I am working with a TreeView, each node represents different datatypes, these datatypes are having properties defined and using data template to show their properties. My application reads from xml and create tree accordingly. My problem is that when I load it, it is too slow, I want to know about the tricks that will help me to improve performance of my(any) wpf application. Edit: Please provide me some tips for better performance in wpf!! I am using wpf Profiler but it is not much helpful for me.

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• How can I pop a view from a UINavigationController and replace it with another in one operation?

  - by Matt Brandt

  I have an application where I need to remove one view from the stack of a UINavigationController and replace it with another. The situation is that the first view creates an editable item and then replaces itself with an editor for the item. When I do the obvious solution within the first view: MyEditViewController *mevc = [[MYEditViewController alloc] initWithGizmo: gizmo]; [self retain]; [self.navigationController popViewControllerAnimated: NO]; [self.navigationController pushViewController: mevc animated: YES]; [self release]; I get very strange behavior. Usually the editor view will appear, but if I try to use the back button on the nav bar I get extra screens, some blank, and some just screwed up. The title becomes random too. It is like the nav stack is completely hosed. What would be a better approach to this problem? Thanks, Matt

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• How to treat an instance variable as an instance of another type in C#

  - by Ben Aston

  I have a simple inheritance heirarchy with MyType2 inheriting from MyType1. I have an instance of MyType1, arg, passed in as an argument to a method. If arg is an instance of MyType2, then I'd like to perform some logic, transforming the instance. My code looks something like the code below. Having to create a new local variable b feels inelegant - is there a way of achieving the same behavior without the additional local variable? public MyType1 MyMethod(MyType1 arg) { if(arg is MyType2) { MyType2 b = arg as MyType2; //use b (which modifies "arg" as "b" is a reference to it)... } return arg; }

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• displaying keyboard raises memory... but it never comes down iPhone

  - by Joshep Freeman

  Hello again. I encountered a weird behavior in memory just by displaying the default keyboard. I've just created a project with an .xib file for testing purposes. This .xib file has an UITextField element in it and it's connected in the .h via: @property(nonatomic, retain) IBOutlet UITextField *sometext; The .m has no changes but: - (void)viewDidAppear:(BOOL)animated { [someText becomeFirstResponder]; } As you see it's very very simple. The problem is that once the keyboard is shown, the memory allocated for it NEVER goes down. I've tested this scenario in another project with the only difference of having two .xib files. Standar pushViewController and popViewController calls are made. Instruments show an increase of 600kb in memory allocations [which are a lot more in the actual iPhone device]. All in all, hehehe. My question is: How do I release the memory allocated for the keyboard?.

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• !(ReferenceEquals()) vs != in Entity Framework 4

  - by Eric J.

  Unless a class specifically overrides the behavior defined for Object, ReferenceEquals and == do the same thing... compare references. In property setters, I have commonly used the pattern private MyType myProperty; public MyType MyProperty { set { if (myProperty != value) { myProperty = value; // Do stuff like NotifyPropertyChanged } } } However, in code generated by Entity Framework, the if statement is replaced by if (!ReferenceEquals(myProperty, value)) Using ReferenceEquals is more explicit (as I guess not all C# programmers know that == does the same thing if not overridden). Is there any difference that's escaping me between the two if-variants? Are they perhaps accounting for the possibility that POCO designers may have overridden ==? In short, if I have not overridden ==, am I save using != instead of ReferencEquals()?

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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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• What's the best BDD framework for working with ASP.NET MVC 2 + C# 4?

  - by Soul_Master

  I just heard about BDD when I watch video of Scott Guthrie in Sweden. One of listener asked question to Scott about How VS2010 and ASP.NET MVC do to support BDD. After that, I search about BDD (Behavior Driven Development) that focus on specification more than unit testing when compares with TDD (Test Driven Development). I found some framework that work with Ruby and Java. But I do not any famous framework for .NET. Please suggest me about BDD framework and summary PROs/CONs of it. PS. Suggested BDD framework must work great on .NET 4, C# 4.0 and ASP.NET MVC 2. Thanks,

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• How does Linq-to-Xml convert objects to strings?

  - by Eamon Nerbonne

  Linq-to-Xml contains lots of methods that allow you to add arbitrary objects to an xml tree. These objects are converted to strings by some means, but I can't seem to find the specification of how this occurs. The conversion I'm referring to is mentioned (but not specified) in MSDN. I happen to need this for javascript interop, but that doesn't much matter to the question. Linq to Xml isn't just calling .ToString(). Firstly, it'll accept null elements, and secondly, it's doing things no .ToString() implementation does: For example: new XElement("elem",true).ToString() == "<elem>true</elem>" //but... true.ToString() == "True" //IIRC, this is culture invariant, but in any case... true.ToString(CultureInfo.InvariantCulture) == "True" Other basic data types are similarly specially treated. So, does anybody know what it's doing and where that's described?

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• Why is Standard Input is not displayed as I type in Mac OS X Terminal application?

  - by BryanWheelock

  I'm confused by some behavior of my Mac OS X Terminal and my Django manage.py shell and pdb. When I start a new terminal, the Standard Input is displayed as I type. However, if there is an error, suddenly Standard Input does not appear on the screen. This error continues until I shut down that terminal window. The Input is still being captured as I can see the Standard Output. E.g. in pdb.set_trace() I can 'l' to display where I'm at in the code. However, the 'l' will not be displayed, just an empty prompt. This makes it hard to debug because I can't determine what I'm typing in. What could be going wrong and what can I do to fix it?

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• DBD::Advantage and 64-bit Perl - Always 6060

  - by WarheadsSE

  I realize that I am attempting to go beyond the "supported" behavior of the manf's released drivers for perl, after all they have only released it in package with x86 .so's. However, since I cannot use their package with x64 Perl on a RHEL 5.4 x86_64 box, and maintaining a seperate install of x86 perl just for this one package, I have made an attempt to get this puppy working thanks to released 64-bit .so's that accompany other driver packages for Advantage. What I have done to this point: download beta 10 DBI drivers, in 32 download beta 10 PHP extension (it contains 32 and x86_64) copy the required DLLs into the ads-lib location (eg /usr/local/ads/lib64) compile the Perl DBI driver with the path to the lib64's .so's Good compilation, good install, good use. The problem is that I always get : failed: [iAnywhere Solutions][Advantage SQL][ASA] Error 6060: Advantage Database Server not available on specified server. axServerConnect (SQL-HY000)(DBD: db_login/SQLConnect err=-1) Does anyone have any ideas? EDIT: fixed package name in post title

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• How Moles Isolation framework is implemented?

  - by Buu Nguyen

  Moles is an isolation framework created by Microsoft. A cool feature of Moles is that it can "mock" static/non-virtual methods and sealed classes (which is not possible with frameworks like Moq). Below is the quick demonstration of what Moles can do: Assert.AreNotEqual(new DateTime(2012, 1, 1), DateTime.Now); // MDateTime is part of Moles; the below will "override" DateTime.Now's behavior MDateTime.NowGet = () => new DateTime(2012, 1, 1); Assert.AreEqual(new DateTime(2012, 1, 1), DateTime.Now); Seems like Moles is able to modify the CIL body of things like DateTime.Now at runtime. Since Moles isn't open-source, I'm curious to know which mechanism Moles uses in order to modify methods' CIL at runtime. Can anyone shed any light?

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• How to change eclipse plugin's default parent-first classloader policy to child-first classloader po

  - by deepthinker121

  Hi All, I want to change the behavior of eclipse's parent-first classloader policy to child-first classloader policy. The scenario would be : Plugin A has class C in dependent external jar. When the classloader of the jar looks for "META-INF" folder - it should find the META-INF folder of the jar and not the one found by its parent classloader - that is the plugin A's META-INF folder. So I want to change the classloader policy to 'child-first' rather than 'parent-first' Is it possible to do this by changing the plugin A's Manifest or plugin.xml?

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• IE7 float/clear bug

  - by alex

  I am having the weirdest behavior in IE7 on this page. I have a clear: left on #moored that makes sure that #content-container will expand to the height of the float: left'd #content. Of course, Firefox and IE8 do it right. The weird thing though, is in IE7, it appears that #content-container is automatically expanding to contain the #secondary-content, which it shouldn't. Even weirder is when I view with IE8 with developer tools, the boundary boxes seem to show the that the #content-container is the expanding to the height of the #secondary-container, even though the background: #fff tells a different story. The background goes to where it should, and the void is now black. I've Googled a bit and came across heaps of similar float bugs, but I don't think I've found one which offers a fix yet for this circumstance. Can anyone please help me?

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