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• Which SEO practises are likely to be responsible for SO questions appearing so quickly in Google sea

  - by morpheous

  Does anyone have some idea as to how come questions posted here on SO are showing up so quickly on Google?. Sometimes questions submitted are appearing as the first 10 entries or so - on the first page within 30 minutes of submitting a question. Pray tell, what sort of magic is being wielded here? Anybody have some ideas, suggestions?. My first thought is that they have info in their sitemap that tells google robots to trawl every N minutes or so - is that whats going on? BTW, I am aware that simply instructing Googlebots to scan your site every N minutes will not work if you dont have quality information (that is constantly being updated on your site). I'd just like to know if there is something else that SO may be doing right (apart from the marvelous content of course)

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• Faster way to perform checks on method arguments

  - by AndyC

  This is mostly just out of curiosity, and is potentially a silly question. :) I have a method like this: public void MyMethod(string arg1, string arg2, int arg3, string arg4, MyClass arg5) { // some magic here } None of the arguments can be null, and none of the string arguments can equal String.Empty. Instead of me having a big list of: if(arg1 == string.Empty || arg1 == null) { throw new ArgumentException("issue with arg1"); } is there a quicker way to just check all the string arguments? Apologies if my question isn't clear. Thanks!

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• Wrapping \NewEnviron into \newenvironment fails

  - by o_O Tync

  Hello! I am trying to wrap an environment created with \NewEnviron (package 'environ') into an old good \newenvironment: \NewEnviron{test}{aaa(\BODY)bbb} \newenvironment{wrapper}{\begin{test}}{\end{test}} \begin{wrapper} debug me \end{wrapper} However, this gives me a strange error: LaTeX Error: \begin{test} on input line 15 ended by \end{wrapper}. LaTeX Error: \begin{wrapper} on input line 15 ended by \end{document}. If I replace \NewEnviron{test}{aaa(\BODY)bbb} with \newenvironment{test}{aaa(}{)bbb} — everything works as expected! It seems like \NewEnviron fails to find its end for some reason. I'm trying to do some magic with 'floatfig' wrapped into a \colorbox so I need a way to convert \colorbox to an environment and wrap it into another one. I can define a new command but it's not a very good idea. Thanks in advance!

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• How do I use a Rails ActiveRecord migration to insert a primary key into a MySQL database?

  - by Terry Lorber

  I need to create an AR migration for a table of image files. The images are being checked into the source tree, and should act like attachment_fu files. That being the case, I'm creating a hierarchy for them under /public/system. Because of the way attachment_fu generates links, I need to use the directory naming convention to insert primary key values. How do I override the auto-increment in MySQL as well as any Rails magic so that I can do something like this: image = Image.create(:id => 42, :filename => "foo.jpg") image.id #=> 42

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• Framework Similar to Pylons for Ruby

  - by Travis

  I've been using Python for most of my web projects lately, and have come to really love the Pylons MVC framework. I like the incredible transparency (lack of magic), the built-in components they selected (sqlalchemy, formencode, routes), and the ability to easily change things up (use a different ORM or templating engine). Moving forward, due to constraints at my company, I'm going to be trying out Ruby rather than Python. I'm wondering if people with experience in both have any recommendations for a Ruby framework that is comparable to Pylons. Python is to Django as Ruby is to Rails Python is to Pylons as Ruby is to ?

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• VB.net 'cross-referencing' tables.

  - by Lee

  Hello, I have a DataGridView that is being filled with data from a table. Inside this table is a column called 'group' that has the ID of an individual group in another table. What I would like to do, is when the DataGridView is filled, instead of showing the ID contained in 'group', I'd like it to display the name of the group. Is there some type of VB.net 'magic' that can do this, or do I need to cross-reference the data myself? Here is a breakdown of what the 2 tables look like: table1 id group (this holds the value of column id in table 2) weight last_update table2 id description (this is what I would like to be displayed in the DGV.) take care, lee BTW - I am using Visual Studios Express.

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• Controller getting NULL value?

  - by RSolberg

  I'm trying to make a call to a controller via jQuery $.post, but the parameter for my controller method keeps getting a NULL value despite it appearing to be setup similar to other controller methods. CONTROLLER [AcceptVerbs(HttpVerbs.Post)] public ActionResult SearchWeatherLocations(string searchFor) { //Do Some Magic } GLOBAL.ASAX routes.MapRoute("SearchWeatherLocations", "Home/SearchWeatherLocations/{searchFor}", new { controller = "Home", action = "SearchWeatherLocations" }); jQuery Call From View <script type="text/javascript" language="javascript"> $(document).ready(function () { GetWeatherLocations("seat"); }); function GetWeatherLocations(sSearchFor) { var divToBeWorkedOn = '#locations'; var webMethod = '<%= Url.Action("SearchWeatherLocations", "Home") %>/'; var url = webMethod + sSearchFor; $.post(url, function (data) { $('#locations').children().remove(); for (var count in data) { $('#locations').append("<li>" + data[count].LocationName + "&nbsp;(" + data[count].LocationCode + ")</li>"); } }); } </script>

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• How do you balance business process changes against the challenges of changing software?

  - by Achilles

  In my admittedly young career I've found myself writing code to support quirky business rules and processes. Inevitably these changes were always in some massively difficult code base and caused many issues. My question has a couple of parts: While software is a tool for businesses to make their lives easier, at what point do we as developers suggest a change in business process rather than in the software as the "magic bullet" to solve a particular problem. How do we as developers evangelize a certain level of reverence for the software as well as the difficulty involved in making changes simply to support the quirks of the business? I understand that these changes in business processes promote our industry, but in an analogy my father would understand: Which is easier, to melt down a hammer to forge a screwdriver to drive screws or to simply use nails since your hammer is already awesome...?

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• Is it possible to implement a GC.GetAliveInstancesOf<T>() (for use in debugging)?

  - by Omer Raviv

  Hi, I know this was answered before, but I'd like to pose a somewhat different question. Is there any conceivable way to implement GC.GetAliveInstancesOf(), that can be evaluated in Visual Studio Debug Watch window? Sasha Goldstein shows one solution in this article, but it requires every class you want to query inherit from a specific base class. I'll emphasize that I only want to use this method during debugging, so I don't care that the GC may change an object's address in memory during runtime. One idea might be to somehow harness the !dumpheap –type command of SOS, and do some magic trick to create a temporary variable and have it point out to the memory address printed by SOS. Does anyone have a solution that works?

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• Start exe even with missing dependency dlls?

  - by k3b

  In Dotnet2.0 and later a program refuses to start if one of its dependent (static referenced) dlls are missing. With Dotnet1.1 and 1.0 the program started but crashed later when trying to use functionality of the missing assembly. I wonder if there is something like a compiler switch , configuration option or a dotnet [attribute] to allow me to start the app when certain dlls are missing. Is it possible without moidfying the sourcecode (execpt by applying some Attriutes)? I don't want to manualy load assemblies by programcode or use IOC-Framworks. Update: With "static referenced dlls" i mean the opposite of dynamicly loading a dll in my own programcode using reflection and Assembly.Loadxxxx(). Update 2010-12-25: This scenario happens for example if you want to use Log4net with Dotnet4 clientprofile together with a WinForms-Aplication: Log4net requires System.Web.dll that is not in Dotnet4-Clientprofile. You must install dotnet4-web-support to use the winforms-aplication that is compiled against log4net unless there is some magic Compiler-switch/Attribute/Configuration that i am still looking for.

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• What are the best options for a root filesystem hosted on SSD under Linux

  - by stsquad

  I'm working on an embedded system which is going to be booting and hosting it's rootfs on an SSD disk. We are currently looking at using Intel X-18M SSDs. The file system structure will have a fairly static /usr section (modulo software upgrades) and an active /var and /var/log for maintaining state and logging. Given the wear-levelling done by the underlying flash does having separate partitions help or hinder? As modern SSDs appear as straight block devices and hide their mapping magic behind their firmware is there any point trying to optimise the choice of file-system that sits on-top of the SSD? Finally does enable SMART monitoring make any sense in this context or are their SSD specific ways of determining the underlying health of the storage hardware?

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• Is it possible to use objects as function paremeters in EL with JBoss EL resolver?

  - by calavera.info

  There is this sentence in JBoss EL resolver online documentation: It's important to fully understand how this extension to EL works. When the page is rendered, the parameter names are stored (for example, hotel.id and user.username), and evaluated (as value expressions) when the page is submitted. You can't pass objects as parameters! But I had used objects as function parameters in my project before I accidentally read this hint and it worked! How is it possible? I'm afraid of that there is some magic now...

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• Type-safe, generic, empty Collections with static generics

  - by Droo

  I return empty collections vs. null whenever possible. I switch between two methods for doing so using java.util.Collections: return Collections.EMPTY_LIST; return Collections.emptyList(); where emptyList() is supposed to be type-safe. But I recently discovered: return Collections.<ComplexObject> emptyList(); return Collections.<ComplexObject> singletonList(new ComplexObject()); etc. I see this method in Eclipse Package Explorer: <clinit> () : void but I don't see how this is done in the source code (1.5). How is this magic tomfoolerie happening!!

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• T4MVC calling controller methods multiple times?

  - by Maslow

  I suspected there was some hidden magic somewhere that stopped what looks like actual method calls all over the place in T4MVC. Then I had a view fail to compile, and the stackTrace went into my actual method, not the generated code in T4MVC. <%=Ajax.ActionLink("Apply", "Apply", new RouteValueDictionary() { { "shortName", item.Shortname } }, new AjaxOptions() { UpdateTargetId = "masterstatus" })%> <%=Html.ActionLink("Apply",MVC.Alliance.Apply(item.Shortname),new AjaxOptions() { UpdateTargetId = "masterstatus" }) %> The second method threw an exception on compile because the method Apply in my controller has an [Authorize] attribute so that if someone that isn't logged on clicks this, they get redirected to login, then right back to this page. There they can click on apply again, this time being logged in. And yes I realize one is Ajax.ActionLink while the other is Html.ActionLink I did try them both with the T4MVC version. Is this a fluke or is it actually calling into the real methods and running my database calling code just to generate the views?

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• Why LINQ will work this way?

  - by Benny

  public static ArrayList GetStudentAsArrayList() { ArrayList students = new ArrayList { new Student() { RollNumber = 1,Name ="Alex " , Section = 1 ,HostelNumber=1 }, new Student() { RollNumber = 2,Name ="Jonty " , Section = 2 ,HostelNumber=2 }, }; return students; } this doesn't compile: ArrayList is not IEnumerable ArrayList lstStudents = GetStudentAsArrayList(); var res = from r in lstStudents select r; but this will compile: ArrayList lstStudents = GetStudentAsArrayList(); var res = from Student r in lstStudents select r; Can anybody explain? what's the magic here?

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• How does refer(r)er work technically?

  - by NoozNooz42

  I don't understand: how are webserver and trackers like Google Analytics able to track referrals? Is it part of HTTP? Is it some (un)specified behavior of the browsers? Apparently every time you click on a link on a web page, the original web page is passed along the request. What is the exact mechanism behind that? Is it specified by some spec? I've read a few docs and I've played with my own Tomcat server and my own Google Analytics account, but I don't understand how the "magic" happens. Bonus (totally related) question: if, on my own website (served by Tomcat), I put a link to another site, does the other site see my website as the "referrer" without me doing anything special in Tomcat?

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• Is there a certain IIS configuration required to allow a functioning .Net 4.0 ASP.Net MVC 2 Azure ap

  - by erg39

  I just installed the Azure 1.2 tools update and would like to get to work on an Azure project running locally using ASP.Net MVC and .Net 4, but I cannot get MVC pages to load. If I just create a new Azure project in VS 2010, add a ASP.Net MVC web role, and run the application, pages never load. It appears that routing is somehow at fault as controller actions never get called, but if I add other pages to the project (like .htm or .aspx) they will load in the browser. It all works fine with a new project using .Net 3.5, MVC 2 project in the Azure development environment; it all works fine with .Net 4.0 MVC 2 project that is not running in Azure; only the combination does not work. Environment is Win 7 x64 (IIS 7.5), VS 2010, Azure tools 1.2 Is there some magic IIS setting I need to change or something? Any ideas?

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• Detecting that the stack is full in C/C++

  - by Martin Kristiansen

  When writing C++ code I've learned that using the stack to store memory is a good idea. But recently I ran into a problem: I had an experiment that had code that looked like this: void fun(unsigned int N) { float data_1[N*N]; float data_2[N*N]; /* Do magic */ } The code exploted with a seqmentation fault at random, and I had no idea why. It turned out that problem was that I was trying to store things that were to big on my stack, is there a way of detecting this? Or at least detecting that it has gone wrong?

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• Can't get custom error rendering to work in symfony 1.4

  - by hongkildong

  I'm tring to customize error rendering in my form according to this example. Here is my code: if ($this['message']->hasError()) { $error_msg = '<ul>'; foreach ($this['message']->getError() as $error) $error_msg .= "<li>$error</li>"; $error_msg .= '</ul>'; } return $error_msg; but when $this['message'] has error this code returns '<ul></ul>' so it seems foreach ($this['message']->getError() as $error) causes no iterations $this['message']->getError() returns sfValidatorError object - maybe something changed in symfony 1.4 and it isn't iterable anymore... At first I thought that all magic in that example happened because of object being placed in $error by iteration implements __toString() but it seems no iterations happens at all...

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• python xml.dom.minidom.Attr question

  - by rudy

  Getting attributes using minidom in Python, one uses the "attributes" property. e.g. node.attributes["id"].value So if I have <a id="foo"></a>, that should give me "foo". node.attributes["id"] does not return the value of the named attribute, but an xml.dom.minidom.Attr instance. But looking at the help for Attr, by doing help('xml.dom.minidom.Attr'), nowhere is this magic "value" property mentioned. I like to learn APIs by looking at the type hierarchy, instance methods etc. Where did this "value" property come from?? Why is it not listed in the Attr class' page? The only data descriptors mentioned are isId, localName and schemaType. Its also not inherited from any superclasses. Since I'm new to Python, would some of the Python gurus enlighten?

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• Dependency Injection with @Inject in Weld (JSR-299 RI). How is the corresponding @Produces found?

  - by Thorbjørn Ravn Andersen

  I have played with the JSR-299 Reference Implementation "Weld" with the purpose of using it in a stand-alone application, and I have had a look at the documentation, and marveled at the magic. My question is how the producer of a given object to be @Inject'ed is found? Either the java compiler produces hints for annotations which is easily found by the classloader, or the complete classpath must be traversed loading all classes to see what they do which sounds highly inefficient to me, or it is a completely different approach. What is the trick?

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• Displaying Google Calendar event data on FullCalendar

  - by aurealus

  I am using Google Calendar as a storage engine for a calendar system I am building, however, I am using a single Google user account with multiple calendars, i.e. each user on my system has their own calendar within the one user account. I'm able to create a calendar per user just fine, but I would like to have FullCalendar retrieve the events for display purposes, without manually getting the magic cookie url from Google Calendar settings. I would like to be able to retrieve it programmatically or 'proxy' the feed via an authenticated call to get event data that I'm doing in Django. $('#calendar').fullCalendar({ events: $.fullCalendar.gcalFeed( "http://www.google.com/calendar_url/" <-- or /my/event/feed/url ) });

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• Regexing it up with IIS re-write module

  - by Michael Jasper

  I am developing a profile-based web application where each user is assigned there own url through their username & iis rewrite mod's magic. A typical user's profile url would be http://www.mymark.com/mike Each user is also created a blog in a multi-user wordpress installation. The wordpress url would look like this: http://www.mymark.com/blog/mike I am trying to use the rewrite module to create more canonical urls for the user (http://www.mymark.com/mike/blog), and have tried several regex variations that I have created through RegExr(a regex generation tool) and come up with this as the pattern to match (www.|)mymark.com/([^/]+)/blog but haven't had any success so far. What am I doing wrong here? Here is a screen shot of my re-write rule:

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• Accessing constructor from abstract base class with reflection

  - by craesh

  Hi! I'm playing around with Java's Reflection. I have an abstract class Base with a constructor. abstract class Base { public Base( String foo ) { // do some magic } } I have some further classes extending Base. They don't contain much logic. I want to instantiate them with Base's constructor, without having to write some proxy contructors in those derived classes. And of course, I want to instantiate those derived classes with Reflection. Say: Class cls = SomeDerivedClass.class; Constructor constr; constr = cls.getConstructor( new Class[] { String.class } ); // will return null Class clsBase = Base.class; constr = clsBase.getConstructor( new Class[] { String.class } ); // ok Base obj = (Base) constr.newInstance( new Object[] { "foo" } ); // will throw InstantiationException because it belongs to an abstract class Any ideas, how I can instantiate a derived class with Base's constructor? Or must I declare those dumb proxy constructors?

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• Using emacs across many hosts

  - by mbac32768

  On a daily basis I: use multiple workstations running either Linux, Windows, or MacOS X edit files on additional Linux hosts that are not any of the workstations mentioned above The only common element here is that the internet connects all of these hosts: workstations and servers. I can keep all of the config files in sync on my workstations too and can run an X server on all of them. What's the right way of running emacs? I don't want to sacrifice any features. In my ideal world I can type 'emacs foo.txt' on a remote host and some magic happens via X forwarding to display the file in my workstation's existing emacs session. Non-solutions tramp: when I'm manipulating a remote host an editor is just part of my workflow. I need a terminal open so I can run other commands quickly. tramp is all wrong for this. ncurses emacs: sucks, I want the graphical kind If you don't have a positive answer to my question, please don't just guess. Thanks.

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