chrismo

Greg Vaughn posted this cool alias the other day:

copr = "!f() { git fetch -fu origin refs/pull/$1/head:pr-$1; git checkout pr-$1; } ; f"

Preferring to be a stock-tools person, I wanted to deconstruct this to see how I'd use it off-the-shelf without the alias.

git fetch     -- I'm already familiar with this command
-fu           -- these two flags I'm not sure are necessary, esp. -u since the help says, 
 "unless you are implementing your own Porcelain you are not supposed to use 

chrismo

As the domain logic gets more complicated and you begin moving toward a
rich Domain Model (116), the simple approach of an Active Record (160)
starts to break down. The one-to-one match of domain classes to tables
starts to fail as you factor domain logic into smaller classes.
Relational databases don't handle inheritance, so it becomes difficult
to use strategies [Gang of Four] and other neat OO patterns. As the
domain logic gets feisty, you want to be able to test it without having
to talk to the database all the time.

Fowler, Martin (2002-11-05). Patterns of Enterprise Application

chrismo

irb(main):001:0> a = 2
=> 2
irb(main):002:0> if a == 0
irb(main):003:1>   puts 'zero'
irb(main):004:1> elsif a < 2
irb(main):005:1>   puts 'less than 2'
irb(main):006:1> else
irb(main):007:1*   puts 'greater than or equal to 2'
irb(main):008:1> end
greater than or equal to 2

chrismo

require 'tmpdir'

def setup
  dir = Dir::tmpdir
  %w(system.log 20130330.log 20130329.log).each do |fn|
    File.open(fn, 'w') { |f| f.print 'fake contents' }
  end
end

def rotate_logs

chrismo

1.9.3-p385

chrismo

1.9.3-p385

chrismo

class BaseFixture
  def self.create(opts={})
    fixture = self.new(opts)
    fixture.save!
    fixture
  end
end

class UserFixture < BaseFixture
  def self.new(opts={})

chrismo

On a clean Rails 4 install with Bundler 1.3.0, using --binstubs causes competition between Rails and Bundler for the contents of bin/rails (and bin/rake).

Just running bundle will rewrite the Rails version of bin/rails to a version that doesn't work.

The fix is to use the new bundle binstubs <gemname> command.

(see rails/rails#8974)

chrismo

require 'minitest/autorun'

def loop_zip(a, b)
  b = b * ((a.length / b.length) + 1) if a.length > b.length
  a.zip(b)
end

class TestLoopZip < MiniTest::Unit::TestCase
  def test_2_and_3
    assert_equal [['a', 1], ['b', 2]], loop_zip(%w(a b), [1, 2, 3])

chrismo

.bundle
.rbenv-version
zz_gems
bin