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Random record from MongoDB
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Starting with the 3.2 release of MongoDB, you can get N random docs from a collection using the $sample aggregation pipeline operator:
// Get one random document from the mycoll collection.
db.mycoll.aggregate([{ $sample: { size: 1 } }])
If you want to select the ...
How do I compare version numbers in Python?
I am walking a directory that contains eggs to add those eggs to the sys.path . If there are two versions of the same .egg in the directory, I want to add only the latest one.
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How to easily resize/optimize an image size with iOS?
My application is downloading a set of image files from the network, and saving them to the local iPhone disk. Some of those images are pretty big in size (widths larger than 500 pixels, for instance). Since the iPhone doesn't even have a big enough display to show the image in its original size, I'...
MySQL: how to get the difference between two timestamps in seconds
Is there a way I can make a query in MySQL that will give me the difference between two timestamps in seconds, or would I need to do that in PHP? And if so, how would I go about doing that?
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Get and set position with jQuery .offset()
How to get and set the position of an element with the jQuery .offset method?
5 Answers
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Replace one character with another in Bash
...ine shell string replacement. Example:
foo=" "
# replace first blank only
bar=${foo/ /.}
# replace all blanks
bar=${foo// /.}
See http://tldp.org/LDP/abs/html/string-manipulation.html for more details.
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Comparing two byte arrays in .NET
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You can use Enumerable.SequenceEqual method.
using System;
using System.Linq;
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var a1 = new int[] { 1, 2, 3};
var a2 = new int[] { 1, 2, 3};
var a3 = new int[] { 1, 2, 4};
var x = a1.SequenceEqual(a2); // true
var y = a1....
How to convert `git:` urls to `http:` urls
I'm working behind an http proxy. I'm trying to clone Android's source tree using their "repo" tool.
4 Answers
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How do I use pagination with Django class based generic ListViews?
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I think you ask for information about using pagination with the new class based views since, with traditional function based views, it is easy to find. I found that just by setting the paginate_by variable is enough to activate the p...
jsonify a SQLAlchemy result set in Flask [duplicate]
I'm trying to jsonify a SQLAlchemy result set in Flask/Python.
15 Answers
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