Updating dyndns automatically from Linux
If you have an account at the eminent service dyndns.com, you can update it automatically from your host by using this method: Start by installing […]
Continue reading »Category: Development
Download EOD data from Yahoo Finance to a Python Pandas Dataframe
If you use the Pandas DataReader and get this message: pandas_datareader.exceptions.ImmediateDeprecationError: Google finance has been immediately deprecated due to large breaks in the API without […]
Continue reading »
Slack shortcuts and commands
I can’t stand long articles so here’s a short bullet list: Searching in:channelname, in:name, from:username, from:me, has:link, has:star, has:emojiname, before, after, on, during Commands /remind […]
Continue reading »Creating a child theme in WordPress
This is a no-nonsense instruction of how to create a child theme in WordPress. We create it from the existing theme “twentynineteen” 1. Create a […]
Continue reading »
Multiple select listboxes in Rails
Since I think the documentation is lacking and I always have to rely on Stackoverflow every time I want to use it, I keep this […]
Continue reading »
Creating your own tag helper in Rails
Lets say you get sick and tired of writing this in your views: <div class=”field”> <%=form.label :location %> <%=form.text_field :location %> </div> and instead you […]
Continue reading »Elegant menu transition in Bootstrap
I like the fixed menu, that stays in place when your scroll the content, but I have seen a few websites do a cool transition […]
Continue reading »Setting up Apache with Letsencrypt certificates
Since you need a domain name, and I almost always use dynamic domain services, I recommend setting up ddclient so that the dynamic DNS is […]
Continue reading »
No thank you!
Putting a server on the internet is today similar to walking alone at night in a part of the city you know nothing about, where […]
Continue reading »A standard HTML header
You should specify a lot of things in your HTML header nowadays. Previously it was enough with some CSS and JS script includes. Now we […]
Continue reading »
Creating a DSL in Ruby
Creating a Domain Specific Language has been on my TODO-list for a long time! Ruby is the perfect language for this task I have collected […]
Continue reading »
Pythons argparse for dummies
Python is a great language, but sometimes it makes life more complicated than necessary. I don’t know if this is because it’s heritage (C) or […]
Continue reading »
Make your own Rails View helpers
Rails helpers like image_url, link_to, form_with, fields_for etc are nifty little “macros” that makes your Rails code smaller and clearer. I mean, who doesn’t prefer […]
Continue reading »
Asymmetric Key Cryptography
I know, it’s a mouthful! I never thought I’d understand asymmetric cryptography, partly because I tend to stay away from REALLY complicated stuff, and partly […]
Continue reading »
Bringing some order in your data files
Lots of harddisk space leads to…. lots of files. Why throw stuff away when keeping it is so cheap? I always end up with a […]
Continue reading »Roadmap for 2018/2019
Too many frameworks? Check. Too many tools? Check. Too many crossroads? Then use this roadmap. It will help you decide which path to take in […]
Continue reading »
Installing OpenCV 3.4.1 using Python 3 on Raspbian Stretch
UPDATED OCT 2020 See this link for a much better procedure: https://medium.com/@aadeshshah/pre-installed-and-pre-configured-raspbian-with-opencv-4-1-0-for-raspberry-pi-3-model-b-b-9c307b9a993a This is left for archiving purposes: As usual, I will keep this […]
Continue reading »Array is an instance of class Class
If the title to this post seems impossible to understand, please read this conversation between Gavin Sinclair and Martin de Mello. Something that was really […]
Continue reading »
What the heck is npx?
If you haven’t lived under a rock for a couple of years, you must have stumbled upon npm, the standard node package manager, in one way […]
Continue reading »10 common GIT problems and how to solve them
Wish I had this list a couple of years ago! https://dev.to/citizen428/10-common-git-problems-and-how-to-fix-them-234o
Continue reading »
Controlling an USB camera from a Raspberry Pi, and doing some image magic! (Part1)
The Raspberry Pi is a fantastic piece of equipment, and what I like the most is that it resembles a standard computer with Ubuntu, just […]
Continue reading »
The best CSS Grid reference page!
A Complete Guide to Grid A great example of how to use Grid CSS to show thumbnails https://codepen.io/SitePoint/pen/JBqgGm
Continue reading »
Where’s the action?
There are so many web frameworks. And their supporters all claim that “their” framework is the one with the most momentum. The site http://hotframeworks.com tries […]
Continue reading »Gulp or Webpack?
First of all, Gulp and Webpack are not beasts of the same kind. Gulp is a task runner, which you can use for various tasks […]
Continue reading »Screen scraping using the Mechanize gem
What do you do, when you want to extract some data from a system, but there is no neat API for that particular service? Well […]
Continue reading »
Design Patterns
Introduction Design Patterns are an important power tool in your toolbox. You will fall back on these trusty patterns again and again, knowing that you […]
Continue reading »
Pimp your Rails site with some Vue.js
Rails is great, but nowadays a full page refresh is as unpopular as male ponytails or shoulder pads. Some write full-stack SPA sites, which is […]
Continue reading »
Gulp or Grunt?
OK, let’s have it, are you a Gulper or a Grunter? To some, build systems are a major issue. To me, not so much. In […]
Continue reading »User sign-in from SPA to Rails backend
Intro Nowadays it is popular to create fullstack-JS applications (meaning both front- and backend written in Javascript) but what if you want to use the […]
Continue reading »
Saving nested models in Rails
Very often, I would say almost always, you have nested models in a Web application. In Rails, you (most often) specify it using has_many and […]
Continue reading »What makes Rails a framework worth learning in 2017?
From Quora: https://www.quora.com/What-makes-Rails-a-framework-worth-learning-in-2017 David Heinemeier Hansson, Creator of Ruby on Rails, Founder & CTO at Basecamp The same reasons why it was a framework […]
Continue reading »
Simple Ajax in Rails 5.2
I’d like to present a short and to-the-point instruction on how to add some Ajax pizazz to a simple Rails-generated page. It won’t take you […]
Continue reading »
Spring Boot
Almost 5 years ago (time flies!) Phil Webb and Dave Syer wrote a blog and twitter entry that boiled down to this: @Controller class ThisWillActuallyRun […]
Continue reading »
Common Rails error you will (most probably) see in your log file
Phil Nash wrote a great article about common Rails errors and how to deal with them. The common errors are: 1. ActionController::RoutingError 2. NoMethodError: undefined […]
Continue reading »
Adding a new website under Apache
Apache Apache is a great piece of website software. What I like the best, is that it is mature and reliable. It is also easy […]
Continue reading »
Good WordPress themes
Divi (https://www.elegantthemes.com) $89/år eller $249 lifetime fee OceanWP Enfold $59 (https://themeforest.net/item/enfold-responsive-multipurpose-theme/4519990)
Continue reading »Useful Linux commands
Note: All commands must be prefixed with “sudo” in case your user account doesn’t have enough privileges. System $ uname -a Displays Linux system information […]
Continue reading »
Java 11 is here!
In accordance with the new policy of releasing a new Java version every 6 months, we now have a fresh installation of Java 11 to […]
Continue reading »
Don’t like Java? Create your own language!
Nowadays, it’s easier than ever to create your own computer language. Whether it’s a simple rule-system, or a full-blown language, you can create the tokenizer […]
Continue reading »
Using microservices when building large-scale systems
Microservices, when supported by a robust framework, is a incredibly productive way of building large-scale services. You get a lot of support from the framework, […]
Continue reading »Installing Oracle Java 9 on OSX/macOS
For macOS/OSX all you need to do is download and run the DMG from http://www.oracle.com/technetwork/java/javase/downloads/jdk9-downloads-3848520.html
Continue reading »Saving GIT passwords
Saving your git password lets you skip giving username/password at every checkin Normally you use git config –global credential.helper store but this is not very […]
Continue reading »Setting up MYSQL, Apache2 and WordPress
MySQL/MariaDB Remember to change bind-address to 0.0.0.0. By default it is set to 127.0.0.1 and then you can’t connect remotely! Exactly which config file it […]
Continue reading »SSH Login without password
http://www.linuxproblem.org/art_9.html Basically you add the content of your own ~/.ssh/id_rsa.pub to the targets ~/.ssh/authorized_keys file. (Replace ‘a’ with your username, A with your hostname or […]
Continue reading »Setting up Oracle Java 9 on Ubuntu
Since Oracles own instructions (https://docs.oracle.com/javase/9/install/installation-jdk-and-jre-linux-platforms.htm) sucks big time, I can recommend this one instead: https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-get-on-ubuntu-16-04 Simple and easy to follow. And it WORKS!
Continue reading »Javascript frameworks 2018
Some alternatives to Angular 1.x (deprecated), Angular 2 (Typescript) and Angular v4 https://www.slant.co/topics/4306/~angular-js-alternatives vue.js riot react (not a framework, per se. It’s a view rendering […]
Continue reading »What you need to know about AWK
General structure BEGIN { print “BEGIN” } /filter1/ { print $0 } /$6 == “Nov”/ { print $1, $2 } […]
Continue reading »
Why Ruby is Great!
The single reason why I started dating Ruby class VCR def initialize @messages = [] end def method_missing(method, *args, &block) @messages << [method, args, block] […]
Continue reading »Fancy Pancy Tech Talk
You can find a lot of business terms here https://en.wikipedia.org/wiki/List_of_business_terms https://en.wikipedia.org/wiki/List_of_buzzwords Churn Rate Churn rate, when applied to a customer base, refers to the proportion […]
Continue reading »Rails relations
problem You know when you want to select records depending on the values of related records (like belongs_to fields) ? scenario class TradingSignal < ActiveRecord::Base […]
Continue reading »Rails HATM (Has and belongs to many)
Nested forms with HABTM and HasManyThrough Start with the models has_many :events # creates …… accepts_nested_attributes_for :events, :allow_destroy => true # creates…. attr_accessible :events_attributes # […]
Continue reading »Running a script “later”
You know how it is, you need to download a 3GB install kit, but don’t want to disturb the missuz by clogging all the bandwidth. […]
Continue reading »Hitta exponentialfunktion från två punkter
Exempel 1 : Hitta den exponentialfunktion som går genom punkterna (1, 2) och (3, 5) Hitta basen a som kvoten mellan y2 och y1 a […]
Continue reading »Heroku
Heroku Rails Receipes Running a migration heroku run rake db:migrate Clearing a PG database on heroku heroku pg:reset DATABASE WARNING: Destructive action postgresql-flexible-10203 will lose […]
Continue reading »