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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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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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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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How to read and write INI file with Python3?
... Gives configparser.MissingSectionHeaderError when using provided example files without the proper section headers.
– Jaakko
May 23 '18 at 11:31
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