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• Polymorphic association inserts 0 instead of raising error when column is misconfigured as Integer

  - by zetetic

  Here's one that stumped me for a while, though in retrospect it should have been obvious. I was getting the error message NoMethodError: undefined method `constantize' for 0:Fixnum when accessing a model through a polymorphic association. Turns out the table on the belongs_to side of the association had an integer type column instead of a string. Easily fixed, but it seems like Rails ought to raise an error in this situation -- instead it happily adds the row with 0 in the type column.

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• What is the minimum number of socket port(s) required for a TCP server?

  - by Gwilym

  Hey SO Doing a some practice questions for exam tomorrow can't figure out this one What is the minimum number of socket port(s) required for a TCP server to connect a TCP client for communication? Surely its just two right? one for the server one for the client, but this seems to obvious. My mates thinks TCP uses two ports at the server end for for data in and one for data out. thanks in advance

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• LINQ TO SQL, Dynamic query with DATE type fields

  - by acanthus

  Hello, I'm building a query with the LINQ dynamic library so I don't know how many potential parameters will I have and I get an error when trying to query DATE type fields: Operator '=' incompatible with operand types 'DateTime' and 'String' When I step through the debugger in the Dynamic.cs it shows that the value is of type string and the field is of type date so the problem is obvious but I have no idea how to approach it. Any ideas? BR

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• Amazon API library for Python?

  - by Kevin

  What Python libraries do folks use for querying Amazon product data? (Amazon Associates Web Service - used to be called E-Commerce API, or something along those lines). Based on my research, PyAWS (http://pyaws.sourceforge.net/) seems okay, but still pretty raw (and hasn't been updated in a while). Wondering if there's an obvious canonical library that I'm just missing.

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• Saving a grails object with a composite id

  - by Jared

  The answer to this may be obvious but how do you save an object, in grails, that has a composite id. I have an object that has a composite id including a long and a date and I am trying to save an instance of the object from the update method of another classes controller, and using (object).save() isn't working. Any tips or suggestions?

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• Are methods also serialized along with the data members in C#?

  - by Shaza

  Hey all, The title is obvious, I need to know if methods are serialized along with object instances in C#, I know that they don't in Java but I'm a little new to C#. If they don't, do I have to put the original class with the byte stream(serialized object) in one package when sending it to another PC? Can the original class be like a DLL file?

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• How do I assign an alias to a function name in C++?

  - by Vulcan Eager

  It's easy to create a new name for a type, a variable or a namespace. But how do I assign a new name to a function? For example, I want to use the name holler for printf. #define is obvious... any other way? Solutions: #define holler printf ...

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• Applications of concurrent queues and stacks in .NET 4

  - by Jon Harrop

  .NET 4 includes new concurrent data structures. The Bag and Dictionary collections have obvious applications but I cannot see any use for the Queue and Stack data structures. What are people using these for? Also, I've noticed that the design based upon linked lists incurs a lot of allocation and that destroys scalability. This is surprising given that the sole purpose of these collections is multicore programming. Is this an inherent limitation or are they just badly implemented?

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• What application virtual machines are written in high level languages?

  - by jeshan

  What application virtual machines are out there that are written in higher level languages? C/C++ looks like the languages of choice (for obvious reasons). What I have found on google is at least two written in Java (both meta-circular) : JikesRVM and Maxine. Anything else that you have found?

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• How does MediaWiki calculate the file path to an image?

  - by Gillian

  Hi All, I'm just installing MediaWiki (loving it). I'm lookin at this for adding images. I can se the logic of [[File:MediaWiki:Image sample|50px]] but where so I set the filepath for "File" (nothing obvious in LocalSettings.php) ... or is there some other logic at work? I'd appreciate any help Thanks

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• How can a program tell if another process is running as a service?

  - by quietdragon

  I have a Win32 program which I can direct to monitor another Win32 process. I want to find a way for the monitoring program to determine if the monitored process is running as a Win32 service. Not all services run as SYSTEM and not all services have services.exe as a direct parent, so I don't regard these obvious techniques as being robust enough.

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• Building an IRC bot in Java

  - by Waltzy

  After some googling an obvious answer or starting point for a Java IRC bot has not presented itself, my question; is there an existing framework to help me do build an IRC bot? Failing that, is this possible using Sockets in Java to do this and has anyone seen an example around the web? cheers guys.

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• I need a dictionary-like mapping between characters and other kinds of objects. Which class would be

  - by nullPointerException

  This is in Squeak/Pharo. If I want to have a mapping between Character objects like $a and $b to other kinds of objects, and want to look up those other objects based on the Character, what is the best class to use? Dictionary is an obvious choice, but seems wasteful to be hashing character objects which are basically already numbers. I guess what I want is a kind of array where the character value (number) is used as an index/offset, but I am not sure if this is possible with Unicode.

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• Tips / Resources for building a Google Chrome plugin

  - by David

  After test driving Google Chrome for 30 minutes or so, I like it, even if it seems bare-bones at the moment. The obvious way to add a few things I can't live without would be through plugins. Does anyone have any links to resources on how to get started building a plugin/addon for Chrome? Thanks.

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• Z-index bug with IE6.. can't seem to figure this one out

  - by Trip

  I am working on this gorgeous header here at : http://kayaskitchenbelmar.com/test/header.html Unfortunately, in IE6, the drop downs that come off of the Print and View buttons collapse on to a new line. This is because of the common z-index bug. I tried resolving this by making the parent div have a higher z-index and position relative with its child a lower z-index and position absolute, but that didn't seem to work. Possibly I'm missing something obvious? Thanks so much

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• c++, when do you need/have to pass data as (*&)

  - by ra170

  I came across people passing data objects as: declaration: DataObject * data = 0; calling it as: SomeMethod( data ); definition of Somethod: void SomeMethod(SomeObject * & object) My obvious question is, when and why do you have to do this (& *)? Is it passing the pointer as reference?

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• Accessing Arbitrary Columns from an R Data Frame using with()

  - by johnmyleswhite

  Suppose that I have a data frame with a column whose name is stored in a variable. Accessing this column using the variable is easy using bracket notation: df <- data.frame(A = rep(1, 10), B = rep(2, 10)) column.name <- 'B' df[,column.name] But it is not obvious how to access an arbitrary column using a call to with(). The naive approach with(df, column.name) effectively evaluates column.name in the caller's environment. How can I delay evaluation sufficiently that with() will provide the same results that brackets give?

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• open word template and run autonew from c#

  - by d daly

  Hi I can open a .dot template from a hyperlink fine, but it opens read-only and does not run the autonew macro. Is there a setting or something obvious Im missing? thanks DD

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• OpenGL how to hide the lines between triangles with vertex coloring?

  - by Ricket

  It's a cube, looking from the corner at two sides. You can pretty easily tell where the four triangles that make up the two sides are. I am drawing it with vertex, color, and index arrays. What causes the obvious line and how might I be able to avoid it?

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• Porting 32 bit C++ code to 64 bit - is it worth it? Why?

  - by NTDLS

  I am aware of some the obvious gains of the x64 architecture (higher addressable RAM addresses, ect)... but: What if my program has no real need to run in native 64 bit mode. Should I port it anyway? Are there any foreseeable deadlines for ending 32 bit support? Would my application run faster / better / more secure as native x64 code?

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• Are methods also serialized along with the data members in .NET?

  - by Shaza

  The title is obvious, I need to know if methods are serialized along with object instances in C#, I know that they don't in Java but I'm a little new to C#. If they don't, do I have to put the original class with the byte stream(serialized object) in one package when sending it to another PC? Can the original class be like a DLL file?

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• python-like Java IO library?

  - by drozzy

  Java is not my main programming language so I might be asking the obvious. But is there a simple file-handling library in Java, like in python? For example I just want to say: File f = Open('file.txt', 'w') for(String line:f){ //do something with the line from file } Thanks!

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• c++ Function pointer inlining

  - by wb

  I know I can pass a function pointer as a template parameter and get a call to it inlined but I wondered if any compilers these days can inline an 'obvious' inline-able function like: inline static void Print() { std::cout << "Hello\n"; } .... void (*func)() = Print; func(); Under Visual Studio 2008 its clever enough to get it down to a direct call instruction so it seems a shame it can't take it a step further?

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• How can I forward a query string using htaccess?

  - by Eric

  I am using this, at present, to rewrite URLS: RewriteEngine on RewriteRule ^([^/?\.]+)$ /page.php?name=$1 [NC] So mysite.com/home gets rewritten to mysite.com/page.php?name=home How can I make it also rewrite mysite.com/home?param=value to mysite.com/page.php?name=home&param=value? Ideally, I'd like this to work for any name/value querystring pairs. Am I missing something obvious?

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• How should i store availability calendar information in mysql? for [id] [date] [available/unavailab

  - by Haroldo

  I'm building a simple calendar for holiday cottages to show when they are booked or available. What would be the fastest mysql table design for this, bearing in mind when users mark dates as available/booked they will do so via a start date and an end date. i can see 2 obvious options Store 'booked' data for every day [more rows] or, store 'booked' data with 2 columns a start_date and end_date [more processing?] Which is best or is there another method i'm missing?

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