I used to think I had a few hobbies, mountain biking, rugby, vege gardening, coding, etc, etc, but then my wife and I bought a Queenslander workers cottage that needed a bit of attention.
I had zero interest in renovation. But this beast has taken over, it consumes every minute of my spare time, and has for the past 2 years.
We're nearing the end of the whole experience, and although feeling exhausted, we're really stoked that a lot of things have come together.
If anyone is interested here is our progress in pictures (apologies for the blogger blog :) Egbert Blog
Setup your app directory
mkdir rails-5-test-app cd rails-5-test-app
Specify your Ruby version
touch .ruby-version echo 'ruby-2.2.2' > .ruby-version
Setup Gemfile with edge rails, rack and arel
touch Gemfile printf "source 'https://rubygems.org'\nruby '2.2.2'\n\n\ngem 'rails', github: 'rails/rails'\ngem 'arel', github: 'rails/arel'\ngem 'rack', github: 'rack/rack'" >> Gemfile bundle
Use rails generators to create new app, and run server
bundle exec rails new . --dev --force bundle exec rails s
Just give me the gist?
I was recently playing with Google's new Photo application. An incredibly powerful little application, yet has an incredibly simple UI.
Google has gone through my entire library of 30k photos and classified them against their boat loads of data.
It's always nice to get a visual sense of what Machine Learning is doing, and after playing with the photo app it's quite clear how it classifies photos.
For example, if I search for 'festival', it finds photo's of all sorts of festivals, from Glastonbury:
To the Soccer World Cup:
To the Notting Hill Carnival:
To a few incorrect ones like these:
You can understand why machine learning might classify these, and it's not really a problem. When we have more data, those results will continue to get better, they will almost definitely result in more accuracy going into the future.
So, what's the problem?
The problem is here; do a search for something like 'desert', I get this result:
Do a search for 'dessert' and I get this result:
So, through our own stupidity, we have trained the machines to think 'dessert' is the same as 'desert'.
A trivial example, but in a time when we are ramping up our dependence on machine learning, we need to remember that the machine is not always correct and it is for the same reason as the crowd is not always correct.
I've had a few close calls when switching between the Dev/Staging/Prod environments. These will save you from any nasty suprises!
Change the colour of the terminal window when you ssh into your staging or production environments. I use a simple bash script that switches when I ssh into certain hosts.
Banner/Ribbon on Staging/Development
I just used a fork of the Github ribbon
Show App Name and Environment when in console
We used this handy gem Marco-Polo
That looks like this in the console:
~/Sites/myapp$ rails c myapp(dev)>
Difference between 'and' and '&&'
cat = 'meow' dog = false answer = cat && dog => false answer => false answer = cat and dog => false answer => 'meow'
Similarly with 'or' and '||'
cat = false dog = 'bark' answer = cat || dog => 'bark' answer => 'bark' answer = cat or dog => 'bark' answer => false
I generally follow this style guide
Some apis just return a timezone offset from UTC. For example Facebook
Need to convert it to a timezone name?
Rails Active Support to the rescue, you just need to do something like this:
utc_offset_in_hours = 10 time_zone = ActiveSupport::TimeZone[utc_offset_in_hours].name => "Brisbane"