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• Ruby on Rails redirect_to not functioning in IF statement?

  - by Hard-Boiled Wonderland

  Hi, I am redirecting a POST request to ensure the URL is correct along with other things. The redirect worked fine before I added in the if statements for town below: if !params[:address].blank? town = Town.find(:all, :conditions => ["name = ?", params[:address]]) @towns = town if !town.blank? redirect_to '/town/' + params[:address] else @town_invalid = 'test' end end end I am sure it is something simple and that I simply cannot see it. Also if you see any glaring errors or code mishaps let me know as I am just starting out. EDIT: I should mention this is what I get back from Safari when a real town is entered: Safari can’t open the page.Safari can’t open the page “http://localhost:3000/” because the server unexpectedly dropped the connection. This sometimes occurs when the server is busy. Wait for a few minutes, and then try again. Thanks!

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• Methods of providing custom reports for an asp.net application

  - by Jarrod

  In our windows application, we used crystal reports. If a customer needed a custom report, we could create it and then send them the rpt file. The customer would then simply add the report file to a custom folder, and could access it directly from our application. Using a web app, how is this possible. It seems like anything created, using ssrs, crystal, or even telerik reporting must be embedded. What are some methods for providing custom reports to users of an asp.net web application?

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• Core Location Best Placement and User Interruption

  - by b.dot

  Hi All, My application uses Core Location in three different views. It's working perfectly. In my first view, I subclass the CLLocationManager and use protocol methods for location updates to my calling class. Before I install the framework and code in my other classes, I was wondering: Is the protocol method the best way? What happens to the Core Location execution if the user exits the view or quits the app while it's trying to get a location fix? Is the location task terminated with the GPS system turned off immediately? If the user simply switches to another view, is it OK to assume that I can start Core Location in the next view without regard to the last? Where should the first update location call be placed. Should the application delegate instantiate the CLLocation Manager class using protocol so that it can update any of the views chosen or should each class instantiate the manager. Any feedback would be appreciated. Thanks.

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• box-shadow : is there a "box-shadow-color" ?

  - by Epaga

  Note: CSS novice here. Be gentle. ;-) I have the following CSS: ... -webkit-box-shadow: inset 0px 0px 2px #a00; -moz-box-shadow: inset 0px 0px 2px #a00; ... Now I am trying to extract that color to make the page colors "skinnable". Is there any way of doing this? Simply removing the color, and then using the same key again later overwrites the original rule. There doesn't seem to be a -webkit-box-shadow-color, at least Google turns nothing up.

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• Chinese encoding issue while listing files

  - by Null Pointer

  I am running a Java application on a Solaris10 with Chinese. Now there are some files in a directory with chinese filenames. When I do files = new File(dir).list() where "dir" is the parent directory containing that chinese file, I get the result filename files[0] as ?????(some junk characters). Now the deal is that my programs file.encoding property is already set to GBK and I also do Charset.isSupported("GBK") and it returns true too. So where could be the problem. I am running out of ideas. NOTE: I am not trying to print the filename anywhere or copy the file or something. I am simply openeing a stream to it, something like below: files = new File(dir).list(); new FileInputStream(files[0]); Now this gives me a FileNotFoundExcpetion, so I debug just to find that value inside files[0] is "??????".

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• Layout components Horizontally in Android

  - by xximjasonxx

  Greetings all, I am trying to create a layout in Android for a notification. My goal is to have the following displayed: 1: Icon for the app 2: Vertically stacked LinearLayout with Session title and Room to be held in 3: The start time of the session The problem I am facing is that #2 has a variable width depending on the size of the title. Hardcoding a width would look terrible if the user turns the handset sideways and goes into Landscape mode. Therefore here is my question: How can I layout three components horizontally in Android such that #1 and #3 are left and right aligned respectively, and #2 simply takes the space remaining? Thanks in advance

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• Git & Web-design: handling multiple customized templates

  - by o_O Tync

  I'm developing a CMS (with Django, but that doesn't matter) and have chosen GIT. Installations will vary in: Configs Database contents Media Templates First 3 are not a problem with git: we simply don't need these :) While developing, I have 1 default template with related media. Later, each customer will receive his own design based on default templates (some slight customization). I'm not going to support each of the custom templates as I introduce new features. Modularity helps with this but is not a 100% solution. Do you have any experience to share?

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• Theory of Computation - Showing that a language is regular..

  - by Tony

  I'm reviewing some notes for my course on Theory of Computation and I'm a little bit stuck on showing the following statement and I was hoping somebody could help me out with an explanation :) Let A be a regular language. The language B = {ab | a exists in A and b does not exist in A*} Why is B a regular language? Some points are obvious to me. If b is simply a constant string, this is trivial. Since we know a is in A and b is a string, regular languages are closed under union, so unioning the language that accepts these two strings is obviously regular. I'm not sure that b is constant, however. Maybe it is, and if so, then this isn't really an issue. I'm having a hard time making sense of it. Thanks!

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• Multi-threading mechanisms to run some lengthy operations from winforms code and communication with

  - by tmarouda

  What do I want to achieve: I want to perform some time consuming operations from my MDI winforms application (C# - .NET). An MDI child form may create the thread with the operation, which may take long time (from 0.1 seconds, to even half hour) to complete. In the meantime I want the UI to respond to user actions, including manipulation of data in some other MDI child form. When the operation completes, the thread should notify the MDI child that the calculations are done, so that the MDI child can perform the post-processing. How can I achieve this: Should I use explicit threading (i.e., create explicit threads), thread pools? Or simply just propose your solution. Should I create foreground or background threads? And how does the thread communicates with the GUI, according the solution you propose? If you know of a working example that handles a similar situation, please make a note.

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• What is the difference between an Abstract Syntax Tree and a Concrete Syntax Tree?

  - by Jason Baker

  I've been reading a bit about how interpreters/compilers work, and one area where I'm getting confused is the difference between an AST and a CST. My understanding is that the parser makes a CST, hands it to the semantic analyzer which turns it into an AST. However, my understanding is that the semantic analyzer simply ensures that rules are followed. I don't really understand why it would actually make any changes to make it abstract rather than concrete. Is there something that I'm missing about the semantic analyzer, or is the difference between an AST and CST somewhat artificial?

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• jQuery/AJAX type-ahead/auto-complete

  - by Prasad

  I have read several articles/questions/forums discussing the best auto-complete plugin for jQuery. After trying several good ones, I've realized a flaw in most. If you are looking up countries and type 'In', a couple of countries show up. If you continue typing I-n-d-i-a, this results in 5 AJAX calls (see http://www.freeimagehosting.net/uploads/6f1bcd69e1.png) its quite natural that India is a subset of In, so why call again? We need to simply filter the retrieved list client-side. Anyone knows about such an implementation? What is the status of the Jquery Autocomplete feature? I read at StackOverflow that it is no longer available with Jquery; but the Jquery website has a 'New' mark besides the link to Autocomplete. Thanks

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• Anything wrong with spamming GC.KeepAlive(KeyboardHookPointer)?

  - by Alex

  GC.KeepAlive() References the specified object, which makes it ineligible for garbage collection from the start of the current routine to the point where this method is called. Not really sure about what GC.KeepAlive does other than simply store a reference so the Garbage Collector doesn't collect the object. But does calling GC.KeepAlive() on an object permanently keep an object from being collected? Or do you have to re-call GC.KeepAlive() every so often (and if so, how often)? I want to keep my keyboard hook alive.

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• EnvDTE: ArgumentException when accessing the ActiveConfiguration

  - by Smith

  Hello, I'm writing an addin for Visual Studio 2008. At some point in my code, I'm attempting to access the current active configuration for a project: var configName = _Project.ConfigurationManager.ActiveConfiguration.ConfigurationName; Sometimes, in some very obscure cases, the getter for ActiveConfiguration throws an ArgumentException. Nothing in the documentation says anything about this (but given the very poor quality of the documentation, it was to be expected), and the exception's message is not helping at all. Also, ConfigurationManager is an interface, and I don't know what's the real implementation behind it, so I can't simply disassemble it in Reflector to know the cause. Any help would be greatly appreciated.

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• Are SOLID principles really solid?

  - by Arseny

  The first pattern stands for this acronym is SRP. Here is a quote. the single responsibility principle states that every object should have a single responsibility, and that responsibility should be entirely encapsulated by the class. That's is simple and clear till we start to code ) Suppose we have a class with well defined SRP. To serialize this class instances we need to add special atrributes to that class. So now the class have other responsibility. Dosen't it violate SRP? Let's see other story. Interface implementation. Then we implement an interface we simply add other responsibility say dispose its resorces or compare its instances or whatever. So my question. Is it possible to keep SRP complete? How can we do it?

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• How do I get the "Install Missing Plugin" yellow bar to appear in firefox when flash is not installe

  - by Janak

  My rails website uses the open_flash_graph plugin to generate flash graphs for my clients. If a customer doesn't have flash installed, it doesn't display any messages, it simply doesn't show any graphs. I've noticed that if I go to other websites that need flash, I get a yellow bar at the top of my firefox window that offers to "Install Missing Plugin". I assume something in the HTML lets firefox know that this webpage needs flash. What code do I need to add to my website to make this work?

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• VS2010 / Code Analysis: Turn off a rule for a project without custom ruleset....

  - by TomTom

  ...any change? The scenario is this: For our company we develop a standard how code should look. This will be the MS full rule set as it looks now. For some specific projects we may want to turn off specific rules. Simply because for a specific project this is a "known exception". Example? CA1026 - while perfectly ok in most cases, there are 1-2 specific libraries we dont want to change those. We also want to avoid having a custom rule set. OTOH putting in a suppress attribute on every occurance gets pretty convoluted pretty fast. Any way to turn off a code analysis warning for a complete assembly without a custom rule set? We rather have that in a specific file (GlobalSuppressions.cs) than in a rule set for maintenance reasons, and to be more explicit ;)

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• Why are getters prefixed with the word "get"?

  - by Joey

  Generally speaking, creating a fluid API is something that makes all programmers happy; Both for the creators who write the interface, and the consumers who program against it. Looking beyond conventions, why is it that we prefix all our getters with the word "get". Omitting it usually results in a more fluid, easy to read set of instructions, which ultimately leads to happiness (however small or passive). Consider this very simple example. (pseudo code) Conventional: person = new Person("Joey") person.getName().toLower().print() Alternative: person = new Person("Joey") person.name().toLower().print() Of course this only applies to languages where getters/setters are the norm, but is not directed at any specific language. Were these conventions developed around technical limitations (disambiguation), or simply through the pursuit of a more explicit, intentional feeling type of interface, or perhaps this is just a case of trickle a down norm. What are your thoughts? And how would simple changes to these conventions impact your happiness / daily attitudes towards your craft (however minimal). Thanks.

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• Problems with mod_Rewrite

  - by Giorgi

  Hello, Originally I had following .htaccess file: php_value display_errors 1 php_value error_reporting 7 AddDefaultCharset utf-8 Options -Indexes <Files ~ ".*\.(info|tpl)$"> Order allow,deny Deny from all </Files> RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /index.php/$1 [L,QSA] Which triggered 500 internal server error, so I moved first two lines to the php.ini file. after that, error disappeared, but redirect is not working, it simply redirects to the empty page, error log shows: file not found also, another log shows: PHP Warning: Unknown: open_basedir restriction in effect. File() is not within the allowed path(s): (/home/:/usr/lib/php:/usr/local/lib/php:/tmp/:/usr/local/:/usr/bin) in Unknown on line 0 I tried to write in RewriteLog which triggered 500 server error again A little help? Thank you in advance P.S. cPanel 11.24.5-STABLE (Build: 38506) Apache version 2.2.15 (Unix) MySQL version 5.0.85-community PHP version 5.2.9 Operating system Linux Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_fcgid/2.3.5

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• JavaScript setTimeout setInterval within one function

  - by dagoof

  I think I might be overtired but I cannot for the life of me make sense of this, and I think it's due to a lack of knowledge of javascript var itv=function(){ return setInterval(function(){ sys.puts('interval'); }, 1000); } var tout=function(itv){ return setTimeout(function(){ sys.puts('timeout'); clearInterval(itv); }, 5500); } With these two functions I can call a=tout(itv()); and get a looping timer to run for 5.5 seconds and then exit, essentially. By my logic, this should work but it simply is not var dotime=function(){ return setTimeout(function(){ clearInterval(function(){ return setInterval(function(){ sys.puts("interval"); }, 1000); }); }, 5500); } any insight in this matter would be appreciated.

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• VS2010 converted project invalid reference

  - by Nathan

  Opening a .Net 2 project in VS2010 it converts the project without any issues BUT when I attempt to build it fails. The reason is that in VS2005 a reference was added to System.Web.Extensions which is a .Net 3.5 assembly. Now VS2005 never complained at this and quite happily worked but VS2010 is far more strict and won't allow it. I've tried changing the targeted framework to .Net 3.5 but I get another situation there where the web page is never displayed, it simply hangs not even getting to Applicatin_OnStart. Any help either on adding the reference with .Net 2 as target framework (prefered option for time) or getting the .Net 3.5 version to work would be greatly appreciated.

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• Generating a list of Strings in Obj C

  - by eco_bach

  Hi It seems that Objective C jumps thru hoops to make seemingly simple tasks extremely difficult. I simply need to create a sequence of strings, image1.jpg, image2.jpg, etc etc ie in a loop var imgString:String='image'+i+'.jpg; I assume a best practice is to use a NSMutableString with appendString method? What am I doing wrong?? NSMutableString *imgString; for(int i=1;i<=NUMIMAGES;i++){ imgString.appendString(@"image"+i+@".jpg"); } I get the following error error: request for member 'appendString' in something not a structure or union

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• Avoiding the Controller with Routing Rules in ASP.NET MVC

  - by Ryan Elkins

  I've created a website with ASP.NET MVC. I have a number of static pages that I am currently serving through a single controller called Home. This creates some rather ugly URLs. example.com/Home/About example.com/Home/ContactUs example.com/Home/Features You get the idea. I'd rather not have to create a controller for each one of these as the actions simply call the View with no model being passed in. Is there a way to write a routing rule that will remove the controller from the URL? I'd like it to look like: example.com/About example.com/ContactUs example.com/Features If not, how is this situation normally handled? I imagine I'm not the first person to run in to this.

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• Python and Postgresql

  - by Ian

  Hi all, if you wanted to manipulate the data in a table in a postgresql database using some python (maybe running a little analysis on the result set using scipy) and then wanted to export that data back into another table in the same database, how would you go about the implementation? Is the only/best way to do this to simply run the query, have python store it in an array, manipulate the array in python and then run another sql statement to output to the database? I'm really just asking, is there a more efficient way to deal with the data? Thanks, Ian

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• Embedding Facebook Connect In A Facebook Page

  - by Russell C.

  Our site allows users to register using Facebook Connect. We also have a Facebook page. We'd like to include the "Connect with Facebook" button in our page so a user could instantly connect (aka register) and then be forwarded on to their account on our site. I was hoping to use the Static FBML page application and the FBML iFrame tag to simply embed the button but it looks like the iFrame tag isn't allowed in Facebook pages. Facebook Connect uses JavaScript so I'm wondering if there is some kind of trick I could use like popping up a page in a new window that would automatically display the connect dialog box. Any ideas on how I would include a Facebook Connect button on our Facebook page would awesome! Thanks in advance for your help.

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• How to tell if a datareader is open on a connection and close it

  - by Earlz

  Hi, I'm setting up a little thing for connection pooling and on of the more common bugs that we have occur(its always an easy fix, but we just can't remember reader.Close()!) it is when we have a connection that is used by a lot of classes/methods and one method opens a data reader and forgets to close it. This isn't really bad cause a lot of times all you have to do is go into the debugger and go up one level and see the function before it was and check if it had an unclosed data reader. Now, here is the bigger problem. In this connection pool, if a datareader is open, then it's not known until a thread gets a connection and tries to use it and the thing that originally opened the data reader may no longer even be alive. So quite simply, how can you detect if a data reader is open on a connection and is there a way to close the reader without closing the connection?

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