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Rails: how do I validate that something is a boolean?
...ield (the field would not be valid for a false value). But in both Rails 3 and 4, having validates :field, inclusion: [true, false] would test for inclusion in a list of values, with the side-effect to test for the field's presence (unless one of those values is nil of course).
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How to convert a clojure keyword into a string?
...on: Invalid token: :foo/bar/baz
(namespace :foo.bar/baz) => "foo.bar"
And this also works with namespace qualified keywords:
;; assuming in the namespace foo.bar
(namespace ::baz) => "foo.bar"
(name ::baz) => "baz"
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Method Resolution Order (MRO) in new-style classes?
...lasses to demonstrate how methods are resolved in classic resolution order and
how is it different with the new order.
4...
How to define servlet filter order of execution using annotations in WAR
...arty libraries which includes a filter? It's hard to tell its order beforehand.
– BalusC
Oct 29 '11 at 19:07
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Valid values for android:fontFamily and what they map to?
In the answer to this question the user lists values for android:fontFamily and 12 variants (see below). Where do these values come from? The documentation for android:fontFamily does not list this information in any place (I checked here , and here ). The strings are listed in the Android ...
Run two async tasks in parallel and collect results in .NET 4.5
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You should use Task.Delay instead of Sleep for async programming and then use Task.WhenAll to combine the task results. The tasks would run in parallel.
public class Program
{
static void Main(string[] args)
{
Go();
}
public static void Go()...
Using NSPredicate to filter an NSArray based on NSDictionary keys
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I know it's old news but to add my two cents. By default I use the commands LIKE[cd] rather than just [c]. The [d] compares letters with accent symbols. This works especially well in my Warcraft App where people spell their name "Vòódòó" making it nearly impossible to search for their name i...
Prepend a level to a pandas MultiIndex
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A nice way to do this in one line using pandas.concat():
import pandas as pd
pd.concat([df], keys=['Foo'], names=['Firstlevel'])
An even shorter way:
pd.concat({'Foo': df}, names=['Firstlevel'])
This can be generalized to many data frames, see the docs.
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Flask vs webapp2 for Google App Engine
I'm starting new Google App Engine application and currently considering two frameworks: Flask and webapp2 . I'm rather satisfied with built-in webapp framework that I've used for my previous App Engine application, so I think webapp2 will be even better and I won't have any problems with it.
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Best practices for using Markers in SLF4J/Logback
We are using SLF4J+Logback combination at our project for a while now and are quite happy with it, but our logging strategy is fairly simple, using straightforward class based loggers and no fancy stuff like MDC or Markers.
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