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Where should Rails 3 custom validators be stored?

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emacs zoom in/zoom out

...C-+ and C-x C--; that is, Control-x Control-Minus/Control-Plus. After one combination (C-x C-+ or C-x C--), successives + or - increase or decrease the text scale without typing C-x C- again. Addition by sawa I looked up the function that was assigned to the keys mentioned, and found out that the...
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What is the difference between Directory.EnumerateFiles vs Directory.GetFiles?

... Lazy evaluation may not come for completely free - for example if you will be putting it back to an array in the end (I saw that!). Lazy is efficient when "yagni"-all: you are not going to need all elements, and just stop iterating after a few. ...
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Can we have multiple “WITH AS” in single sql - Oracle SQL

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How to get a enum value from string in C#?

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Building executable jar with maven?

...error when I double-click on the first jar: Could not find the main class: com.gorkwobble.logmanager.LogManager. Program will exit. If you applied the suggested configuration of the link posted as reference, you configured the jar plugin to produce an executable artifact, something like this: &l...
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Getting value of public static final field/property of a class in Java via reflection

.... Exception is thrown at the operation f.getInt(null). I caught it but how come there's an exception? – Viet Apr 21 '10 at 18:26 1 ...
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Opening port 80 EC2 Amazon web services [closed]

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Generating CSV file for Excel, how to have a newline inside a value

...nstead of utf-8, and your non-ASCII characters will be trashed. Following comments apply to Excel 2003, 2007 and 2013; not tested on Excel 2000 If you open the file by double-clicking on its name in Windows Explorer, everything works OK. If you open it from within Excel, the results vary: You h...
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How to get a reference to a module inside the module itself?

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