jnaadjie

Originally published in June 2008

When hiring Ruby on Rails programmers, knowing the right questions to ask during an interview was a real challenge for me at first. In 30 minutes or less, it's difficult to get a solid read on a candidate's skill set without looking at code they've previously written. And in the corporate/enterprise world, I often don't have access to their previous work.

To ensure we hired competent ruby developers at my last job, I created a list of 15 ruby questions -- a ruby measuring stick if you will -- to select the cream of the crop that walked through our doors.

What to expect

Candidates will typically give you a range of responses based on their experience and personality. So it's up to you to decide the correctness of their answer.

/config/initializers/omniauth.rb

def provider_facebook
  'facebook'
end

def facebook_opts
  my_model_obj = MyModelService.find_by_provider_name(provider_facebook)

error info:

➜  hh (develop-hh) ✔ gem install libv8 -v '3.16.14.11'
Building native extensions.  This could take a while...
ERROR:  Error installing libv8:
	ERROR: Failed to build gem native extension.

    current directory: /Users/simonqian/.rvm/gems/ruby-2.2.2/gems/libv8-3.16.14.11/ext/libv8
/Users/simonqian/.rvm/rubies/ruby-2.2.2/bin/ruby -r ./siteconf20170410-48026-19k49a7.rb extconf.rb
creating Makefile

	http://stackoverflow.com/questions/22667401/postgres-json-data-type-rails-query
	http://stackoverflow.com/questions/40702813/query-on-postgres-json-array-field-in-rails

	#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")

	-- 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%'

	brew tap homebrew/versions
	brew install v8-315

	gem install libv8 -v '3.16.14.13' -- --with-system-v8
	gem install therubyracer -- --with-v8-dir=/usr/local/opt/v8-315

	bundle install

	gem "lograge"
	gem "logstash-event"
	gem "logstash-logger"