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Delete a key from a MongoDB document using Mongoose
...de-mongodb-native driver. Each model has a collection object that contains all the methods that node-mongodb-native offers. So you can do the action in question by this:
User.collection.update({_id: user._id}, {$unset: {field: 1 }});
Since version 2.0 you can do:
User.update({_id: user._id}, {$u...
How does java do modulus calculations with negative numbers?
...eneral, int result = (-a) % b; gives the right answer when |-a| > b. In order to get the proper result when |-a| < b we should wrap the divisor. int result = ((-a) % b) + b; for negative a or int result = (((-a) % b) + b) % b; for positive or negative a
– Oz Edri
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Counting array elements in Python [duplicate]
... in an array, because contrary to logic array.count(string) does not count all the elements in the array, it just searches for the number of occurrences of string.
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Removing colors from output
...cording to Wikipedia, the [m|K] in the sed command you're using is specifically designed to handle m (the color command) and K (the "erase part of line" command). Your script is trying to set absolute cursor position to 60 (^[[60G) to get all the OKs in a line, which your sed line doesn't cover.
(P...
Adding a parameter to the URL with JavaScript
In a web application that makes use of AJAX calls, I need to submit a request but add a parameter to the end of the URL, for example:
...
How to include JavaScript file or library in Chrome console?
... aware of the fact that even getElementById() doesn't work consistently on all browsers - see this answer for details.)
UPDATE:
It's been years since I wrote this answer and I think it's worth pointing out here that today you can use:
SystemJS
ModuleLoader
jspm.io
to dynamically load scripts...
Delete files older than 15 days using PowerShell
...is in the title of this post), but here's some code that will first delete all of the files older than 15 days, and then recursively delete any empty directories that may have been left behind. My code also uses the -Force option to delete hidden and read-only files as well. Also, I chose to not use...
SVN Error - Not a working copy
...min to filter out old projects I no longer need. So my repository contains all the info I need, but has a new UUID. In this case, I'm just going to tar up the changed files, get a fresh checkout, and then untar.
– Drarok
Aug 28 '09 at 15:21
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Why is lock(this) {…} bad?
...enerally out of your control who else might be locking on that object.
In order to properly plan parallel operations, special care should be taken to consider possible deadlock situations, and having an unknown number of lock entry points hinders this. For example, any one with a reference to the o...
SELECT INTO a table variable in T-SQL
..., if you don't declare the columns explicitly, then they are mapped in the order declared in the original create table statement, just like select * does. So, location in the select statement is mapped to oldlocation in the @userData table because location is in position 2 in the result set of the ...