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Show filename and line number in grep output
...ly and used this example command: grep -Hnor "localhost" . This listet up all matches with file name and line number, short and concise.
– Tore Aurstad
Sep 10 '18 at 8:25
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how to add records to has_many :through association in rails
...ata from the joint table Agents without having N+1 bug example displaying all the houses and corresponding agents for the given customer
– Ankita.P
Jul 24 '15 at 11:00
add a ...
Is Java RegEx case-insensitive?
In Java, when doing a replaceAll to look for a regex pattern like:
5 Answers
5
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ViewParam vs @ManagedProperty(value = “#{param.id}”)
...alues. Since JSF 2.2 you could use <f:viewAction> for that instead.
Allows for nested <f:converter> and <f:validator> for more fine-grained conversion/validation. Even a <h:message> can be attached.
Can be included as GET query string using includeViewParams attribute of &l...
Chain-calling parent initialisers in python [duplicate]
... B inheriting from A, class C inheriting from B. What is a generic way to call a parent class initialiser in an initialiser? If this still sounds too vague, here's some code.
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How is Generic Covariance & Contra-variance Implemented in C# 4.0?
...hat will become IEnumerable<out T>. That doesn't hurt type safety at all, but lets you return an IEnumerable<string> from a method declared to return IEnumerable<object> for instance.
Contravariance is harder to give concrete examples for using interfaces, but it's easy with a del...
How to create an array containing 1…N
...want an array of numbers 1..n that you can later loop through.
If this is all you need, can you do this instead?
var foo = new Array(45); // create an empty array with length 45
then when you want to use it... (un-optimized, just for example)
for(var i = 0; i < foo.length; i++){
document.w...
Traverse a list in reverse order in Python
... are reversed on the fly while traversing! This is an important feature of all these iteration functions (which all end on “ed”).
– Konrad Rudolph
Feb 9 '09 at 19:10
9
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Rails “validates_uniqueness_of” Case Sensitivity
... 3rd Edition:
...despite its name, validates_uniqueness_of doesn’t really guarantee that column values will be unique. All it can do is verify that no column has the same value as that in the record being validated at the time the validation is performed. It’s possible for two records to be ...
Referring to the null object in Python
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SyntaxError: cannot assign to keyword
It's therefore safe to assume that all None references are the same. There isn't any "custom" None.
To test for None use the is operator
When writing code you might be tempted to test for Noneness like this:
if value==None:
pass
Or to test for falsehood l...