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Feature: Facebook Connect

  Scenario: Sign in with Facebook
    When I go to the sign in page
    And I press "Sign in with Facebook"
    And Facebook returns uid:"123", nickname:"chunky.bacon", first_name:"Chunky", last_name:"Bacon", email:"bacon@mysite.co.nz"
    Then I should see "Your mysite account was successfully created"

harssh

...

gem 'devise',
    :git => 'https://github.com/plataformatec/devise.git',
    :branch => 'omniauth'

gem 'oa-oauth', :require => 'omniauth/oauth'

...

harssh

# in spec/support/omniauth_macros.rb
module OmniauthMacros
  def mock_auth_hash
    # The mock_auth configuration allows you to set per-provider (or default)
    # authentication hashes to return during integration testing.
    OmniAuth.config.mock_auth[:twitter] = {
      'provider' => 'twitter',
      'uid' => '123545',
      'user_info' => {
        'name' => 'mockuser',

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module Devise
  module Models
    # Registerable is responsible for everything related to registering a new
    # resource (ie user sign up).
    module Registerable
      extend ActiveSupport::Concern

      module ClassMethods
        # A convenience method that receives both parameters and session to
        # initialize a user. This can be used by OAuth, for example, to send

harssh

Check Memory Usage in Real-Time

You can check your current memory usage using this command:

watch -n 1 free -m




This command will also display in real-time your system memory usage:

harssh

# Define a "warnings" validation bucket on ActiveRecord objects.
#
# @example
#
#   class MyObject < ActiveRecord::Base
#     warning do |vehicle_asset|
#       unless vehicle_asset.description == 'bob'
#         vehicle_asset.warnings.add(:description, "should be 'bob'")
#       end
#     end

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# This command will list all table in a rails app in rails console

ActiveRecord::Base.connection.tables

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# requires :password_reset_token and :password_reset_token_expires_at fields
module PasswordResetable
  extend ActiveSupport::Concern

  included do
    before_validation do
      if password_reset_token_expires_at && password_reset_expires_at.past?
        expire_password_reset!
      end
    end

harssh

Optimizing Rust container builds

I'm a Rust newbie, and one of the things that I've found frustrating is that the default docker build experience is extremely slow. As it downloads crates, then dependencies, then finally my app - I often get distracted, start doing something else, then come back several minutes later and forget what I was doing

Recently, I had the idea to make it a little better by combining multistage builds with some of the amazing features from BuildKit. Specifically, cache mounts, which let a build container cache directories for compilers & package managers. Here's a quick annotated before & after from a real app I encountered.

Before

This is a standard enough multistage Dockerfile. Nothing seemingly terrible or great here - just a normal build stage, and a smaller runtime stage.

harssh

The validation syntax where multiple columns combination is validated for uniqueness is :

validates_uniqueness_of :column_namae1, :scope => [:column_name2, :column_name3]

or even shorter in ruby 1.9.x:

validates_uniqueness_of :column_name1, scope: [:column_name2, :column_name3]