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Index on multiple columns in Ruby on Rails
...:user_id, :article_id], you can perform a fast query on user_id or user_id AND article_id, but NOT on article_id.
Your migration add_index line should look something like this:
add_index :user_views, [:user_id, :article_id]
Question regarding 'unique' option
An easy way to do this in Rails ...
How to refer environment variable in POM.xml?
... ${env.VARIABLE_NAME} will do what you want.
I will add a word of warning and say that a pom.xml should completely describe your project so please use environment variables judiciously. If you make your builds dependent on your environment, they are harder to reproduce
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Easiest way to rename a model using Django/South?
I've been hunting for an answer to this on South's site, Google, and SO, but couldn't find a simple way to do this.
4 Answ...
Phase • Animations made easy! - Extensions - Kodular Community
... "regular" scheme is dark */
/* user picked a theme a light scheme and also enabled a dark scheme */
/* deal with light scheme first */
@media (prefers-color-scheme: light) {
:root {
--primary: #000000;
--secondary: #ffffff;
--te...
Setting focus on an HTML input box on page load
... @PeterMortensen when I tested this 9 years ago was on firefox, chrome and ie :)
– Saikios
Jul 1 '19 at 16:34
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Android: What is better - multiple activities or switching views manually?
I have developed some apps for Android, and this questions stays always:
7 Answers
7
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How can I get the sha1 hash of a string in node.js?
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See the crypto.createHash() function and the associated hash.update() and hash.digest() functions:
var crypto = require('crypto')
var shasum = crypto.createHash('sha1')
shasum.update('foo')
shasum.digest('hex') // => "0beec7b5ea3f0fdbc95d0dd47f3c5bc275da8a33...
Dispelling the UIImage imageNamed: FUD
...Feb 2014: Note that this question dates from iOS 2.0! Image requirements and handling have moved on a lot since then. Retina makes images bigger and loading them slightly more complex. With the built in support for iPad and retina images, you should certainly use ImageNamed in your code .
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Why doesn't RecyclerView have onItemClickListener()?
I was exploring RecyclerView and I was surprised to see that RecyclerView does not have onItemClickListener() .
32 Ans...
What is the difference between Int and Integer?
In Haskell, what is the difference between an Int and an Integer ? Where is the answer documented?
6 Answers
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