My Blog
There’s plenty of information online on how to configure Postfix and Dovecot but it turned out that there were a few last-mile steps that aren’t adequately documented. I remember my first go-around was pretty hairy, but the second time, I found a better starting point and learned from the first experience. So I decided to set things down, both for my benefit and that of others.
Recently, while mentoring a couple of kids who are starting to learn programming (using Ruby), I encountered the challenge of explaining the %f/d/g notation for formatting data in a string.
The notation is used in converting data into representations that can be printed as (part of) a string. The operation is called string interpolation. The format is used in commands like printf, and the syntax is typically like this:
printf(<string with format specs>, data value 1, data value 2, …)
I just built my second gem – I thought I’d have written about the first, but somehow it escaped my attention. The first one is already on RubyGems, and generates a seed for you from the Weather Underground API by pulling together a string from some of the weather data on the feed.
When I started writing the second one, I realized that I didn’t remember the very first command I had run to create the gem’s template files – the gemspec, the lib/ and test/ folder, and so on. So here’s a quick round-up of some good tutorials on gem-cutters. I used bundle btw, and here’s a shameless plug: I’ve uploaded a slightly modified set of template files generated from bundle gem, with this one including the requisite files to write tests using minitest.
How do you learn programming, if you don’t know anything about programming at all? I’ve been very curious about this problem, especially in recent months, as I hear stories of the digital divide, and the growing gap between STEM graduates and jobs in the US. There is also the question of digital equity – if someone has already gone past school and college without exposure to the basics of programming, what are their options for catching up?
I spent about six years and change studying for two degrees in Computer Science. I learned how to program before I joined college. But a lot has changed since I went to college, and while it might have been expensive and difficult to introduce oneself to these concepts back then, today there are a host of services and tools that make it much easier and faster to come up to speed on how programming works.
This blog post is the first in a series that focus on these services and tools, to teach someone who isn’t a programmer, to learn how to teach themselves the skills. These posts will assume not that you are a programmer, but that you’re willing to follow the exercises, search for answers on the Internet, and be creative in attempting to find the answers.
I am working on a Rails3 application, and learned some interesting gotchas today.
Rails
Git and Github
git remote set-url <your Github remote name> git@github.com:siruguri/Categorizer
I am sure I’ll learn more as I go along!
When you start using Rails, if you, like me, just use things the way they come out of the box, you were probably using SQLite3 as your default database. Your first inkling that this might not be sufficient will come when you try to push your Rails app to Heroku’s servers (“dynos.”) Heroku wants you to use PostgreSQL instead.
When you first install the Heroku Toolbelt on your machine, there’s a good chance you will run into a problem with pushing your code via git to the Heroku remote. The common issue is an error message that looks something like this:
Permission denied (publickey).
fatal: Could not read from remote repository.
What you are seeing here is a problem with how your private/public key pairs are configured between your computer and the Heroku server. If you already know what public/private key pairs are, you can skip ahead to the explanation of how to fix this.
I started following the remarkable guide over on Created By Pete, but ran into some problems.
When you install Ruby via rbenv, it needs OpenSSL, and it appears that you need to install the version that Homebrew gives you:
brew install openssl
The installation notes that this version might conflict with the version that’s already installed with OSX:
Specifically, this is about adding the ability to select pieces of text inside your tinyMCE editor, and having a dropdown of styles to choose from that you can apply to that text.
You need to do two things –
I asked a co-worker to help me understand the differences between the two systems/appilcations, and here’s what he said (with PII removed). I am publishing it here because I think it’s a great narration:
My background using Lucene, Solr, and ElasticSearch: a few years ago, I was asked to participate in a project as the architect, lead developer, and manufacturing SME. Let’s call it KTRP.
KTRP was purposed for many functions/capabilities; one being the aggregation, indexing, search, and other NLP capabilities against product engineering documents, tech specifications, and support documentation. I chose Lucene as the index/search engine.