amitpatelx

group :development do
  # rake routes is slow and painful. view routes in browser - http://localhost:3000/rails/routes.
  gem 'sextant' #default in Rails 4
  
  # turns off the Rails asset pipeline log. suppresses asset messages in your development log
  gem 'quiet_assets'
  
  # powerful alternative to the standard IRB
  # features: syntax highlighting, a flexible plugin architecture, runtime invocation and source and documentation browsing.
  gem 'pry-rails'

amitpatelx

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.

amitpatelx

pins = Pin.group(:name).having('count("name") > 1').count(:name) 

{"Adam"=>2,
 "Beulings"=>2,
 "Bord'Eau (Hotel De L'Europe Amsterdam)"=>2,
 "Ciel Bleu (Hotel Okura Amsterdam)"=>2,
 "Coffee Plaza"=>2,
 "Da Portare Via"=>3,
 "Dappertutto"=>2,
 "En Pluche"=>2,

amitpatelx

blank? will load the entire array, then check to see if the array is empty.

On the other hand, empty? asks the database for a count, and checks to see if that count is zero or not. This might not make a difference in small datasets (like development), but it can make a big difference in databases with large datasets (like production).

It will also make a huge difference in memory consumption when thousands of records are loaded vs a single integer.

Reference:

http://hashrocket.com/blog/posts/rails-quick-tips-easy-activerecord-optimizations

amitpatelx

ActiveRecord::Base.connection.tables.map do |model|
  unless ['schema_migrations', 'cic_user_profiles'].include?(model)
    klass = model.capitalize.singularize.camelize.constantize
    puts "Deleting #{klass}"
    klass.delete_all 
  end
end

amitpatelx

# Using before method
before do
  @customer = Customer.new(:name => "Amazon")  
end  
  
it "should be valid" { @customer.should be_valid }  
  
# Using let method  
let(:customer) { Customer.new(:name => "Amazon") }   
  

amitpatelx

$count = 0
describe "let" do
  let(:count) { $count += 1 }

  it "memoizes the value" do
    count.should eq(1)
    count.should eq(1)
  end

  it "is not cached across examples" do

amitpatelx

require "rspec/expectations"

class Thing
  def widgets
    @widgets ||= []
  end
end

describe Thing do
  before(:all) do

amitpatelx

  # Renders the template located in [TEMPLATE_ROOT]/weblog/show.r(html|xml) (in Rails, app/views/weblog/show.erb)
  render :template => "weblog/show"

  # Renders the template with a local variable
  render :template => "weblog/show", :locals => {:customer => Customer.new}

amitpatelx

Rails::Initializer.run do |config|
  config.time_zone = "UTC"
end