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Best way to select random rows PostgreSQL
...lass WHERE oid = 'schema_name.big'::regclass;
As long as ct isn't much smaller than id_span, the query will outperform other approaches.
WITH params AS (
SELECT 1 AS min_id -- minimum id <= current min id
, 5100000 AS id_span -- rounded up. (max_id - m...
How to unit test a Node.js module that requires other modules and how to mock the global require fun
...inject mocks for required modules.
Proxyquire has a very simple api which allows resolving the module you are trying to test and pass along mocks/stubs for its required modules in one simple step.
@Raynos is right that traditionally you had to resort to not very ideal solutions in order to achieve...
RSS Feeds in ASP.NET MVC
...
Here is what I recommend:
Create a class called RssResult that
inherits off the abstract base class
ActionResult.
Override the ExecuteResult method.
ExecuteResult has the ControllerContext passed to it by the caller and with this you can get the data and content type...
Nginx 403 forbidden for all files
I have nginx installed with PHP-FPM on a CentOS 5 box, but am struggling to get it to serve any of my files - whether PHP or not.
...
Print list without brackets in a single row
...
print(', '.join(names))
This, like it sounds, just takes all the elements of the list and joins them with ', '.
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libpng warning: iCCP: known incorrect sRGB profile
...geMagick's
convert in.png out.png
To remove the invalid iCCP chunk from all of the PNG files in a folder (directory), you can use mogrify from ImageMagick:
mogrify *.png
This requires that your ImageMagick was built with libpng16. You can easily check it by running:
convert -list format | gre...
How to get values from IGrouping
...> implements IEnumerable<TElement>, you can use SelectMany to put all the IEnumerables back into one IEnumerable all together:
List<smth> list = new List<smth>();
IEnumerable<IGrouping<int, smth>> groups = list.GroupBy(x => x.id);
IEnumerable<smth> smths = ...
Can I run multiple versions of Google Chrome on the same machine? (Mac or Windows)
...
In the comments, I mentioned a step-by-step method to easily install multiple Chrome versions, side-by-side. This answer quotes my original answer, and includes a script which does the job for you.
Quoted from: section 7 of Cross-browser testing: All major browsers on ONE machine:
...
How to avoid scientific notation for large numbers in JavaScript?
... and browsers based on it (Chrome, the new Edge [v79+], Brave) and Firefox all have support; Safari's support is underway.
Here's how you'd use BigInt for it: BigInt(n).toString()
Example:
const n = 13523563246234613317632;
console.log("toFixed (wrong): " + n.toFixed());
console.log("BigInt...
How do you bind an Enum to a DropDownList control in ASP.NET?
...ic class Enumeration
{
public static IDictionary<int, string> GetAll<TEnum>() where TEnum: struct
{
var enumerationType = typeof (TEnum);
if (!enumerationType.IsEnum)
throw new ArgumentException("Enumeration type is expected.");
var dictionar...