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Where to define custom error types in Ruby and/or Rails?
... GemName
class AuthenticationError < StandardError; end
class InvalidUsername < AuthenticationError; end
end
an example of this would be something like this in httparty
For Ruby on Rails
Put them in your lib/ folder under a file called exceptions.rb, which would look something like t...
See what process is using a file in Mac OS X
...gh the running apps) but Activity Monitor does show it to be running. Stupid Preview.
– Dave Sag
Aug 15 '12 at 1:27
T...
Convert data.frame column format from character to factor
...rs] <- lapply(dat[, character_vars], as.factor)
This creates a vector identifying which columns are of class character, then applies as.factor to those columns.
Sample data:
dat <- data.frame(var1 = c("a", "b"),
var2 = c("hi", "low"),
var3 = c(0, 0.1),
...
mkdir's “-p” option
...r request, not returning any error in case that directory exists.
About rlidwka, Google has a very good memory for acronyms :). My search returned this for example: http://www.cs.cmu.edu/~help/afs/afs_acls.html
Directory permissions
l (lookup)
Allows one to list the contents of a directory. ...
Java Persistence / JPA: @Column vs @Basic
... @Basic(optional) is (should be) checked on runtime by persistence provider before saving to DB. @Column is a column definition in database and is used for schema generation : stackoverflow.com/questions/2899073/…
– Piotr Gwiazda
Jun 16 '10 at 10:30
...
How to un-escape a backslash-escaped string?
...the input is guaranteed to only contain ASCII characters, this is not a valid solution.
– Alex Peters
Jun 9 '19 at 11:46
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show 5 more comme...
Git - working on wrong branch - how to copy changes to existing topic branch
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how can i "get rid" of them from the master branch.. to leave that clean?
– Alex
May 11 '11 at 12:30
7
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Why can't I use the 'await' operator within the body of a lock statement?
...d it yourself is a testament to that fact. Rather, it is an incredibly bad idea and so we don't allow it, so as to protect you from making this mistake.
call to Monitor.Exit within ExitDisposable.Dispose seems to block indefinitely (most of the time) causing deadlocks as other threads attempt to...
How to check for the type of a template parameter?
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Use is_same:
#include <type_traits>
template <typename T>
void foo()
{
if (std::is_same<T, animal>::value) { /* ... */ } // optimizable...
}
Usually, that's a totally unworkable design, though, and you really want to specialize:
template <typename T> void foo() { /...
Golang: How to pad a number with zeros when printing?
... can I print a number or make a string with zero padding to make it fixed width?
6 Answers
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