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Rails: How does the respond_to block work?
...nController.
it takes a block, which is like a delegate. The block is from do until end, with |format| as an argument to the block.
respond_to executes your block, passing a Responder into the format argument.
http://api.rubyonrails.org/v4.1/classes/ActionController/Responder.html
The Responder ...
How do you determine what SQL Tables have an identity column programmatically
...
Another potential way to do this for SQL Server, which has less reliance on the system tables (which are subject to change, version to version) is to use the
INFORMATION_SCHEMA views:
select COLUMN_NAME, TABLE_NAME
from INFORMATION_SCHEMA.COLUMNS
wh...
How do you clear the focus in javascript?
...
Answer: document.activeElement
To do what you want, use document.activeElement.blur()
If you need to support Firefox 2, you can also use this:
function onElementFocused(e)
{
if (e && e.target)
document.activeEleme...
Using an SSH keyfile with Fabric
How do you configure fabric to connect to remote hosts using SSH keyfiles (for example, Amazon EC2 instances)?
8 Answers
...
How do I create an average from a Ruby array?
... you'll want for avoiding any problems from integer division. You can also do:
arr = [5, 6, 7, 8]
arr.inject(0.0) { |sum, el| sum + el } / arr.size
=> 6.5
You can define it as part of Array as another commenter has suggested, but you need to avoid integer division or your results will be wrong...
How can I prevent the scrollbar overlaying content in IE10?
...ies.less file, line 21 you can find the following CSS code
// IE10 in Windows (Phone) 8
//
// Support for responsive views via media queries is kind of borked in IE10, for
// Surface/desktop in split view and for Windows Phone 8. This particular fix
// must be accompanied by a snippet of JavaScrip...
How do I print the type of a variable in Rust?
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If you merely wish to find out the type of a variable and are willing to do it at compile time, you can cause an error and get the compiler to pick it up.
For example, set the variable to a type which doesn't work:
let mut my_number: () = 32.90;
// let () = x; would work too
error[E0308]: mism...
How do I insert a linebreak where the cursor is without entering into insert mode in Vim?
... press the Esc key
You'll see the following at the bottom of your vim window until you press the final Enter:
:map g i^M^[
Explanation:
[Ctrl+V] means "quote the following character" -- it allows you to embed the newline and escape characters in the command.
So you're mapping the 'g' key to t...
Override console.log(); for production [duplicate]
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For some browsers and minifiers, you may need to apply this onto the window object.
window.console = console;
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What are the differences between B trees and B+ trees?
... between B+ trees and B trees.
Advantages of B+ trees:
Because B+ trees don't have data associated with interior nodes, more keys can fit on a page of memory. Therefore, it will require fewer cache misses in order to access data that is on a leaf node.
The leaf nodes of B+ trees are linked, so do...