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Index on multiple columns in Ruby on Rails
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The order does matter in indexing.
Put the most selective field first, i.e. the field that narrows down the number of rows fastest.
The index will only be used insofar as you use its columns in sequence starting at the beginnin...
Django's SuspiciousOperation Invalid HTTP_HOST header
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If your ALLOWED_HOSTS is set correctly, then it is possible someone is probing your site for the vulnerability by spoofing the header.
There is discussion right now by the Django developers to change this from a 500 internal server...
What should a Multipart HTTP request with multiple files look like? [duplicate]
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This is really NOT a good example. Why would you choose a boundary that already has -- in it for an example. If someone doesn't know that that boundary is the again prefixed with another 2 -- you're screwed.
– Eri...
append multiple values for one key in a dictionary [duplicate]
...e "parallel arrays", where items are implicitly associated with each other by having the same index rather than being proper children of a container that encompasses them both.
share
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improve this ...
Reordering of commits
...the base. Git will present you with a list of the commits in this range. Reorder them and tell git to squash the appropriate ones:
pick c ...
pick a ...
squash d ...
squash e ...
squash g ...
pick b
squash f
Now the history should look like this:
c - [a+d+e+g] - [b+f] (branchA)
/
--o-x-x-...
How to turn off INFO logging in Spark?
I installed Spark using the AWS EC2 guide and I can launch the program fine using the bin/pyspark script to get to the spark prompt and can also do the Quick Start quide successfully.
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How to create ASP.NET Web API Url?
... neither in your views nor in the standard controllers.
UPDATE:
And in order to do routing outside of an ApiController you could do the following:
public class HomeController : Controller
{
public ActionResult Index()
{
string url = Url.RouteUrl(
"DefaultApi",
...
How do I use Ruby for shell scripting?
...r, options)
rm(list, options)
rm_r(list, options)
rm_rf(list, options)
install(src, dest, mode = <src's>, options)
chmod(mode, list, options)
chmod_R(mode, list, options)
chown(user, group, list, options)
chown_R(user, group, list, options)
touch(list, options)
Which is pretty nice
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Python Pandas merge only certain columns
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You can use .loc to select the specific columns with all rows and then pull that. An example is below:
pandas.merge(dataframe1, dataframe2.iloc[:, [0:5]], how='left', on='key')
In this example, you are merging dataframe1 and dataframe2. You have chosen to do an outer left jo...
What exactly is Type Coercion in Javascript?
...hen it converts the type of data you described in your program by force in order to comply with its rules. That behavior is known as … (drum roll) ... type coercion.
Now let's look at some examples in JavaScript. First, let's start with an expression that does not lead to type coercion.
5 + 5
...