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• Why are there magic attributes exposed in the Servlet spec?

  - by Brabster

  It's always seemed a little at odds with the principles of Java that the Java Servlet Spec (2.5 version here) includes a set of magic attributes containing info about included resources, namely: javax.servlet.include.request_uri javax.servlet.include.context_path javax.servlet.include.servlet_path javax.servlet.include.path_info javax.servlet.include.query_string It's not even specifically pointed out in the API documentation, only in the spec where it is a must for correct implementation. This approach feels very wrong, an exposed implementation detail that clients will use and depend on. Why is this information exposed in this way?

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• How to make activerecord use a field generated on the fly by find_by_sql

  - by Tam

  I'm using find_by_sql with Activerecord which I generate another field there that doesn't in the original table as a combination of different fields like: select (field1 + field2) as new_field_name If I try to access the newly generated field like: @user.new_field_name I get nothing! How do you suggest I should approach this problem

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• GWT - Reusing Callback Class

  - by moorsu

  My custom callback class implements AsyncCallback (like MyAsyncCallback implements AsyncCallback) and planning use single instance of MyAsyncCallback for multiple rpc method executions. Is this approach safe?. Or should have to create new instance of MyAsyncCallback for every interaction from browser to server?. I am kind of tired of seeing so many anonymous AsyncCallback code blocks. Thanks for your input

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• Java - Multithreading

  - by RayAllen

  I have a doubt ... Can we call thread_object.start() from within a constructor ? Is this approach a good idea ? Thanks.

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• Calculate business days

  - by AdamTheHutt

  Hi, I need a method for adding "business days" in PHP. For example, Friday 12/5 + 3 business days = Wednesday 12/10. At a minimum I need the code to understand weekends, but ideally it should account for US federal holidays as well. I'm sure I could come up with a solution by brute force if necessary, but I'm hoping there's a more elegant approach out there. Anyone? Thanks.

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• Grails query not using GORM

  - by Tihom

  What is the best way to query for something without using GORM in grails? I have query that doesn't seem to fit in the GORM model, the query has a subquery and a computed field. I posted on stackoverflow already with no response so I decided to take a different approach. I want to query for something not using GORM within a grails application. Is there an easy way to get the connection and go through the result set?

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• Date versus time interval plotting in Matplotlib

  - by wb

  The pyplot plot_date function expects pairs of dates and values to be plotted with a certain line style. Is there a recommended approach to plot multiple values or interval data against date/time values?

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• What is the difference between these 2 XML LINQ Queries?

  - by Jon

  I have the 2 following LINQ queries and I haven't quite got my head around LINQ so what is the difference between the 2 approaches below? Is there a circumstance where one approach is better than another? ChequeDocument.Descendants("ERRORS").Where(x=>(string)x.Attribute("D") == "").Count(); (from x in ChequeDocument.Descendants("ERRORS") where (string)x.Attribute("D") == "" select x).Count())

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• How to get all objects with their children using django orm?

  - by kender

  Hi, I got very simple hierarchical structure: every object can have 0 or 1 parent. There's no limit on how many children each object can have. So in my application I got such a model: class O(Model): name = CharField(max_length = 20) parent = ForeignKey('O', related_name = 'children') Now I would like to be able to fetch all objects who have a particular one Object1 in their parent-tree (as in their parent or parent of their parents, etc). Should I use mptt or is there a simpler approach?

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• Is there a "fancy" Ruby way to check whether a local variable is both defined and evaluates to true without using ands and ors?

  - by Steven Xu

  This is quite a quick question. I currently use do_this if (testvar ||= false) Which works just fine. But this approach unnerves me because while fast, it does not short-circuit like defined?(testvar) && testvar does, and it instantiates and assigns a value to a local variable that is subsequently never used, which seems inefficient. I enjoy the very reasonable fact that instance variables are nil before assignment, but I'd like for the situation to be just as easy for local variables.

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• jQuery/javascript replace tag type

  - by Matrym

  Is there an easy way to loop through all td tags and change them to th? (etc). My current approach would be to wrap them with the th and then remove the td, but then I lose other properties etc.

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• Windows Mobile 6.5 modern GUI development

  - by dominolog

  Hello How to approach a modern GUI development in Windows Mobile 6.5. I can see in .NET CF 2.0/3.5 only legacy common controls, no alpha blended controls, no fading etc. Comparing to Android or Symbian, Windows Mobile 6.5 look-a-like of applications is very elderly. Is there support for WPF in Windows Mobile 6.5? Thanks and Regards Dominik

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• Android Repetitive Task

  - by Steve

  In an Activity, I need to call a web service every 30 seconds or so, and use the data to update the UI. Is there a recommended approach on how to schedule a repetitive task? Thanks

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• Web for mobile devices - best practices for ASP.NET

  - by Kb

  Starting to build web applications for mobile devices (any phone). What would be the best approach using ASP.NET 3.5/ASP.NET 4.0 and C#? UPDATE (feb2010) Any news using windows mobile 7?

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• Wrapping a Delphi TFrame descendant as an ActiveX control

  - by Mmarquee

  I am trying to wrap up a TFrame descendant as an ActiveX control, but don't seem to be able to get the control to show up in the ActiveX Control wizard. Is this approach possible, and if so, are there any working examples that I can be pointed at. I have tried to follow the instructions here, but as I said the control show in the list of available controls. Thanks in advance.

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• Campus Tour iPhone App

  - by itska

  I am I want to develop a Campus Map application on iPhone. I am searching for a way to figure out how to sync Current Location from Maps with my campus map. Or is there any other approach for building this app ? Suggest some good websites/ blogs/ groups working on something similar so that I can get information.

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• iPhone/iPad. How do I launch an app from link in Safari?

  - by dugla

  I have an app that I want to be launchable either explicitly when tapped or when a parameterized URL is clicked on on a webpage in Safari running on iPad or iPhone. Can someone sketch the approach for me and/or point me to the relevant docs? Thanks so much. Cheers, Doug

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• How do you programmatically move the caret of a Flex TextArea to the end?

  - by Akinwale

  I'm trying to move the caret in a Flex TextArea to the end after appending some text from my code. I've looked through the reference documentation for TextArea and its underlying TextField but it appears there is no method provided to handle this. One approach I've tried is to set focus to the text area and dispatch a KeyUp KeyboardEvent with the event's key code set to the "End" key, but this doesn't work. Any ideas on how to do this? Thanks.

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• Unit Testing something that returns nothing, how to assert?

  - by Bas

  How would you assert code like this? What would be the best approach to do so? if (myProperty == 0) return;

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• All permissions with declarative_authorization

  - by pablorc

  Hi, I have a Rails application using Restful authentication and declarative authorization. I have some roles with an admin. Is there any method to have automatically granted all permissions to this role, instead of hardcode every controller in the authorization_rules? Something like: role :admin do has_permission_on :everything, :to => :manage end Or a uglier approach with introspection, maybe? Thanks in advance

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• Cleanest way to find objects matching certain criteria in a java.util.List?

  - by Allain Lalonde

  I could write myself a helper class that does this when given a functor, but I was wondering if there's a better approach, or if there's something already in the standard library (seems like there should be). Answers I've found on StackOverflow are all for C# which doesn't help me. Thanks

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• .NET Reflection Helper API?

  - by Paul Kohler

  When using reflection we typically just was the basic System.Reflection API but I am wondering if anyone know of a nice "wrapper" layer or API that has a more "schema style" approach? (e.g. kind of like a code generators DB schema view)

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• get data from online once and then viewable offline

  - by user313100

  Okay, I want to have an app that takes phone numbers from an online database and displays them in a table view. When the user is not online, I want them to still be able to see the numbers they already got from the database in the table view. If the user manages to go back online, the database updates the view. My question is, is this possible to do and if so, what's the best way to approach it? (bit of a newbie, please help me out)

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• Is it possible to call a C function, given its name as a string?

  - by benjamin button

  I saw this question in one of the C puzzles!! Is this really possible? How can I call a function, given its name as a string? is it possible to use string that is read with scanf be used directly to call a function? i already have thought of if(strcmp(str,"string"))then call the function. but is there any other approach?

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• Is is possible to dynamically load a user control at runtime based on a condition within an UpdatePa

  - by Rob Packwood

  I need to conditionally load a few nested user controls on a webpage based on a dropdown selection that fires a callback. Is this possible? Are there any best practices for such an approach?

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