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Rails: Using greater than/less than with a where statement
...
I've only tested this in Rails 4 but there's an interesting way to use a range with a where hash to get this behavior.
User.where(id: 201..Float::INFINITY)
will generate the SQL
SELECT `users`.* FROM `users` WHERE (`users`.`id` >= 201)
The same can be done for less than with -Float::INFI...
How to read the RGB value of a given pixel in Python?
...')
width = photo.size[0] #define W and H
height = photo.size[1]
for y in range(0, height): #each pixel has coordinates
row = ""
for x in range(0, width):
RGB = photo.getpixel((x,y))
R,G,B = RGB #now you can use the RGB value
...
Cast Double to Integer in Java
... What happens when the double value is outside of the integer range? (like 2^33)
– nikdeapen
Oct 3 '14 at 1:52
5
...
How to install the current version of Go in Ubuntu Precise
...h:
sudo apt-get install bison mercurial
bash < <(curl -LSs 'https://raw.githubusercontent.com/moovweb/gvm/master/binscripts/gvm-installer')
. "$HOME/.gvm/scripts/gvm"
and then it's as easy as doing this:
gvm install go1.1.1
gvm use go1.1.1 --default
The default flag at the end of the sec...
Remove the last line from a file in Bash
...e $ means "the last line in the file". When specifying a location (called "range" in sed lingo) before a command, that command is only applied to the specified location. So, this command explicitly says "in the range of the last line in a file, delete it". Quite slick and straight to the point, if y...
Pinging servers in Python
...sing this module, you need root access due to the fact that it is crafting raw packets under the hood.
import pyping
r = pyping.ping('google.com')
if r.ret_code == 0:
print("Success")
else:
print("Failed with {}".format(r.ret_code))
...
What would cause an algorithm to have O(log log n) complexity?
...e. A vEB-tree is a specialized data structure for storing integers in the range 0 ... N - 1. It works as follows: the root node of the tree has √N pointers in it, splitting the range 0 ... N - 1 into √N buckets each holding a range of roughly √N integers. These buckets are then each interna...
PostgreSQL LIKE query performance variations
...card at the beginning of the match string so the executor can use an index range scan. (the relevant comment in the docs is here) Lower and ilike will also lose your ability to use the index unless you specifically create an index for that purpose (see functional indexes).
If you want to search for...
How can I convert spaces to tabs in Vim or Linux?
... 'expandtab' is reset (:verbose set ts? et? is your friend). retab takes a range, so I usually specify % to mean "the whole file".
:set tabstop=2 " To match the sample file
:set noexpandtab " Use tabs, not spaces
:%retab! " Retabulate the whole file
Before doing anything like t...
ASP.NET MVC Ajax Error handling
...Phrase);
}
}
}
Javascript code in the view
var url = '@Html.Raw(@Url.Action("ChildItems", "WorkflowItemModal")';
$.ajax({
type: "GET",
dataType: "json",
url: url,
contentType: "application/json; charset=utf-8",
success: function (data) {
// Do something wi...