大约有 42,000 项符合查询结果（耗时：0.1303秒） [XML]
rails 3 validation on uniqueness on multiple attributes
... I would have written:
validates_uniqueness_of :zipcode, :scope => :recorded_at
In Rails 3:
validates :zipcode, :uniqueness => {:scope => :recorded_at}
For multiple attributes:
validates :zipcode, :uniqueness => {:scope => [:recorded_at, :something_else]}
...
Accessing nested JavaScript objects and arays by string path
...
I just made this based on some similar code I already had, it appears to work:
Object.byString = function(o, s) {
s = s.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties
s = s.replace(/^\./, ''); // strip a leading dot
var a = s.split('.');
for (var i = 0, n ...
date format yyyy-MM-ddTHH:mm:ssZ
I assume this should be pretty simple, but could not get it :(.
In this format Z is time zone.
T is long time pattern
How could I get a date in this format except by using
...
Create array of symbols
...
The original answer was written back in September '11, but, starting from Ruby 2.0, there is a shorter way to create an array of symbols! This literal:
%i[address city state postal country]
will do exactly what you want.
...
Why use sprintf function in PHP?
I am trying to learn more about the PHP function sprintf() but php.net did not help me much as I am still confused, why would you want to use it?
...
How to programmatically display version/build number of target in iOS app?
...
There are 2 Numbers!
The marketing release number is for the customers, called version number. It starts with 1.0 and goes up for major updates to 2.0, 3.0, for minor updates to 1.1, 1.2 and for bug fixes to 1.0.1, 1.0.2 . This number is oriented about releases and new features....
In Gradle, how do I declare common dependencies in a single place?
...eference that dependency from child modules without specifying the version or scope or whatever.
7 Answers
...
Why does isNaN(“ ”) (string with spaces) equal false?
...ue NaN. That helped me understand it better.
– xdhmoore
Feb 20 '14 at 23:08
3
...
How does autowiring work in Spring?
I'm a little confused as to how the inversion of control ( IoC ) works in Spring .
11 Answers
...
Using print statements only to debug
I have been coding a lot in Python of late. And I have been working with data that I haven't worked with before, using formulae never seen before and dealing with huge files. All this made me write a lot of print statements to verify if it's all going right and identify the points of failure. But, ...