Skip to content

Instantly share code, notes, and snippets.

View kofronpi's full-sized avatar

Pierre-Alexandre Kofron kofronpi

View GitHub Profile
Kartones /
Last active April 12, 2024 17:44
PostgreSQL command line cheatsheet


Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

  • -E: will describe the underlaying queries of the \ commands (cool for learning!)
  • -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)
staltz /
Last active April 12, 2024 16:37
The introduction to Reactive Programming you've been missing
rgreenjr / postgres_queries_and_commands.sql
Last active April 12, 2024 05:15
Useful PostgreSQL Queries and Commands
-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
FROM pg_stat_activity
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
ORDER BY query_start desc;
-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query
FROM pg_stat_activity
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'
cobyism /
Last active April 9, 2024 19:49
Deploy to `gh-pages` from a `dist` folder on the master branch. Useful for use with [yeoman](

Deploying a subfolder to GitHub Pages

Sometimes you want to have a subdirectory on the master branch be the root directory of a repository’s gh-pages branch. This is useful for things like sites developed with Yeoman, or if you have a Jekyll site contained in the master branch alongside the rest of your code.

For the sake of this example, let’s pretend the subfolder containing your site is named dist.

Step 1

Remove the dist directory from the project’s .gitignore file (it’s ignored by default by Yeoman).

// slack2html
// by @levelsio
hopsoft / db.rake
Last active April 3, 2024 13:13
Rails rake tasks for dump & restore of PostgreSQL databases
# lib/tasks/db.rake
namespace :db do
desc "Dumps the database to db/APP_NAME.dump"
task :dump => :environment do
cmd = nil
with_config do |app, host, db, user|
cmd = "pg_dump --host #{host} --username #{user} --verbose --clean --no-owner --no-acl --format=c #{db} > #{Rails.root}/db/#{app}.dump"
puts cmd
mankind / rails-jsonb-queries
Last active January 29, 2024 05:38
Ruby on Rails-5 postgresql-9.6 jsonb queries
#payload: [{"kind"=>"person"}]
Segment.where("payload @> ?", [{kind: "person"}].to_json)
#data: {"interest"=>["music", "movies", "programming"]}
Segment.where("data @> ?", {"interest": ["music", "movies", "programming"]}.to_json)
Segment.where("data #>> '{interest, 1}' = 'movies' ")
Segment.where("jsonb_array_length(data->'interest') > 1")
rstacruz /
Last active November 3, 2023 09:56
Rails models cheatsheet

Rails Models

Generating models

$ rails g model User




mourner / TileLayer.Common.js
Created February 11, 2012 23:11
Leaflet shortcuts for common tile providers
// Lefalet shortcuts for common tile providers - is it worth adding such 1.5kb to Leaflet core?
L.TileLayer.Common = L.TileLayer.extend({
initialize: function (options) {, this.url, options);
(function () {
brambow / postgis-to-geojson-feature-collection.sql
Last active April 25, 2023 15:44
PostGIS query to build a GeoJSON FeatureCollection
SELECT json_build_object(
'type', 'FeatureCollection',
'crs', json_build_object(
'type', 'name',
'properties', json_build_object(
'name', 'EPSG:4326'
'features', json_agg(