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Rails - Validate Presence Of Association?
...ciations with validates_existence_of (which is a plugin):
Example snippet from this blog entry:
class Tagging < ActiveRecord::Base
belongs_to :tag
belongs_to :taggable, :polymorphic => true
validates_existence_of :tag, :taggable
belongs_to :user
validates_existence_of :user, :allo...
Is generator.next() visible in Python 3?
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Is there any justification for the switch from a method to a function, beyond g.next() should really be g.__next__(), and we need to have something that isn't a dunder method with the functionality of g.next()?
– T.C. Proctor
De...
Bash Script: count unique lines in file
I have a large file (millions of lines) containing IP addresses and ports from a several hour network capture, one ip/port per line. Lines are of this format:
...
CSS two divs next to each other
... @Mussser I agree with your comment but keep in mind this answer comes from 2009... a time when what you call "older versions of Ie" (i.e : IE8 and under) were "current" versions of IE...
– Laurent S.
Feb 6 '15 at 14:14
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What is meant by the term “hook” in programming?
...as writing. I'm unsure exactly what this term implies although I inferred from the conversation that a hook is a type of function. I searched for a definition but was unable to find a good answer. Would someone be able to give me an idea of what this term generally means and perhaps a small examp...
SqlAlchemy - Filtering by Relationship Attribute
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You have to query the relationsip with join
You will get the example from this Self-Referential Query Strategies
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Handlebars.js Else If
...nd that you do this with a helper function to separate your business logic from presentation.
– Max Hodges
Mar 16 '13 at 13:59
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pandas resample documentation
... @zyuang, only short formats are displayed here : "ms" is also absent from the list for instance
– Julien__
Jul 9 at 16:58
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Check for internet connection availability in Swift
...et out to translate this to Swift. I hit many snags but thanks to Martin R from StackOverflow, I managed to resolve them and finally get a workable solution in Swift. Here is the code.
import Foundation
import SystemConfiguration
public class Reachability {
class func isConnectedToNetwork() -...
Media query to detect if device is touchscreen
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In 2017, CSS media query from second answer still doesn't work on Firefox. I found a soluton for that: -moz-touch-enabled
So, here is cross-browser media query:
@media (-moz-touch-enabled: 1), (pointer:coarse) {
.something {
its: work...