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How can I rename a field for all documents in MongoDB?
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You can use:
db.foo.update({}, {$rename:{"name.additional":"name.last"}}, false, true);
Or to just update the docs which contain the property:
db.foo.update({"name.additional": {$exists: true}}, {$rename:{"name.additional":"name.last"}}, ...
history.replaceState() example?
... whatever your current location href is
window.history.replaceState( {} , 'foo', '/foo' );
console.log( window.location.href ); // oh, hey, it replaced the path with /foo
There is more to replaceState() but I don't know what exactly it is that you want to do with it.
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What does void mean in C, C++, and C#?
...void in the argument list is optional. However, in C, it is NOT optional: foo() means it takes any number of parameters of any type, whereas foo(void) means it takes zero parameters.
– Adam Rosenfield
Jun 28 '09 at 5:00
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Checking for a null int value from a Java ResultSet
...et#getObject(). Substitute -1 with whatever null-case value you want.
int foo = resultSet.getObject("foo") != null ? resultSet.getInt("foo") : -1;
Or, if you can guarantee that you use the right DB column type so that ResultSet#getObject() really returns an Integer (and thus not Long, Short or By...
Unix shell script to truncate a large file
...ou don't actually need a command to go along with the redirection:
$ echo foo > foo.txt
$ cat foo.txt
foo
$ > foo.txt
$ cat foo.txt
$
A simple redirection all by itself will clear the file.
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What is the quickest way to HTTP GET in Python?
...mport urllib.request
contents = urllib.request.urlopen("http://example.com/foo/bar").read()
Python 2:
import urllib2
contents = urllib2.urlopen("http://example.com/foo/bar").read()
Documentation for urllib.request and read.
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Why does PHP 5.2+ disallow abstract static class methods?
... might expect:
<?php
abstract class ParentClass {
static function foo() {
echo "I'm gonna do bar()";
self::bar();
}
abstract static function bar();
}
class ChildClass extends ParentClass {
static function bar() {
echo "Hello, World!";
}
}
ChildClas...
How to get the last N records in mongodb?
... you have some id or date field called "x" you would do ...
.sort()
db.foo.find().sort({x:1});
The 1 will sort ascending (oldest to newest) and -1 will sort descending (newest to oldest.)
If you use the auto created _id field it has a date embedded in it ... so you can use that to order by .....
Best way to load module/class from lib folder in Rails 3?
...So in case you try to put into lib/my_stuff/bar.rb something like:
module Foo
class Bar
end
end
It will not be loaded automagically. Then again if you rename the parent dir to foo thus hosting your module at path: lib/foo/bar.rb. It will be there for you. Another option is to name the file yo...
Accessing dict keys like an attribute?
I find it more convenient to access dict keys as obj.foo instead of obj['foo'] , so I wrote this snippet:
27 Answers
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