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How to get the original value of an attribute in Rails
...ibute will give you the previous value.
For rails 5.1+
Copied from Lucas Andrade's answer below: https://stackoverflow.com/a/50973808/9359123
Appending _was is deprecated in rails 5.1, now you should append _before_last_save
Something like:
before_save object
do_something_with object.name_...
Remove Identity from a column in a table
We have a 5GB table (nearly 500 million rows) and we want to remove the identity property on one of the column, but when we try to do this through SSMS - it times out.
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Regular expression for letters, numbers and - _
...iteral .
References
regular-expressions.info/Anchors, Character Classes and Repetition
In PHP
Here's a snippet to show how you can use this pattern:
<?php
$arr = array(
'screen123.css',
'screen-new-file.css',
'screen_new.js',
'screen new file.css'
);
foreach ($arr as $s) {
if...
How does setting baselineAligned to false improve performance in LinearLayout?
I was just building some UI in xml, and Lint gave me a warning and said to set android:baselineAligned to false to improve performance in ListView.
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Does every Javascript function have to return a value?
...-like comments to each function, I write. So I begin each of it with /** and then I press Enter to let Netbeans fulfill default comment scheme for following function.
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How to solve “The specified service has been marked for deletion” error
I try to remove a Windows Service with sc delete <service name> , and encounter the following error:
21 Answers
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How can I discover the “path” of an embedded resource?
...tility
{
/// <summary>
/// Takes the full name of a resource and loads it in to a stream.
/// </summary>
/// <param name="resourceName">Assuming an embedded resource is a file
/// called info.png and is located in a folder called Resources, it
/// will be co...
How do I specify local .gem files in my Gemfile?
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Wouldn't it just be easier to run "gem server" on the command line and add source "localhost:8808" to your Gemfile
– Anna
Oct 9 '12 at 21:19
6
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Select columns from result set of stored procedure
I have a stored procedure that returns 80 columns, and 300 rows. I want to write a select that gets 2 of those columns. Something like
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How to implement a Map with multiple keys? [duplicate]
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Two maps. One Map<K1, V> and one Map<K2, V>. If you must have a single interface, write a wrapper class that implements said methods.
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