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Rails :include vs. :joins
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.joins will just joins the tables and brings selected fields in return. if you call associations on joins query result, it will fire database queries again
:includes will eager load the included associations and add them in memory. :includes loads all the included tables attributes. If you call ...
MySql server startup error 'The server quit without updating PID file '
...r_computer_name.local.err
It's probably problem with permissions
check if any mysql instance is running
ps -ef | grep mysql
if yes, you should stop it, or kill the process
kill -9 PID
where PID is the number displayed next to username on output of previous command
check ownership of...
Why doesn't Haskell's Prelude.read return a Maybe?
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This function (called readMaybe) is now in the Haskell prelude! (As of the current base -- 4.6)
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Python Script execute commands in Terminal
...s module:
from subprocess import call
call(["ls", "-l"])
Reason is that if you want to pass some variable in the script this gives very easy way for example take the following part of the code
abc = a.c
call(["vim", abc])
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What characters are allowed in DOM IDs? [duplicate]
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Actually there is a difference between HTML and XHTML.
As XHTML is XML the rules for XML IDs apply:
Values of type ID MUST match the Name production.
NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] |
[#xD8-...
Lambda function in list comprehensions
...gnostic discussion this is enough.
So much for the job interview question.
Now, how to make a list of multiplier lambdas, which really multiply by consecutive integers? Well, similarly to the accepted answer, we need to break the direct tie to i by wrapping it in another lambda, which is getting cal...
Check if a user has scrolled to the bottom
...he .scroll() event on window, like this:
$(window).scroll(function() {
if($(window).scrollTop() + $(window).height() == $(document).height()) {
alert("bottom!");
}
});
You can test it here, this takes the top scroll of the window, so how much it's scrolled down, adds the height of th...
How to identify server IP address in PHP
How can I identify the server IP address in PHP?
15 Answers
15
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Facebook share link without JavaScript
...gs e)
{
var referer = Request.UrlReferrer.ToString();
if(string.IsNullOrEmpty(referer))
{
// some error logic
return;
}
Response.Clear();
Response.Redirect("https://www.facebook.com/sharer/sharer.php?u=" + HttpUtility.UrlE...
How do HashTables deal with collisions?
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If chaining is used, when given a key, how do we know which item to get back?
– ChaoSXDemon
Oct 10 '15 at 4:04
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