latortuga

def delete_failed_job_if
  redis = Resque.redis

  (0...Resque::Failure.count).each do |i|
    string = redis.lindex(:failed, i)
    break if string.nil?

    job = Resque.decode(string)
    should_delete_job = yield job
    next unless should_delete_job

latortuga

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x0 pc=0x0]

goroutine 10 [running]:
runtime.gopanic(0x5a7020, 0xc8200101b0)
        /usr/local/go/src/runtime/panic.go:461 +0x3e6
runtime.panicmem()
        /usr/local/go/src/runtime/panic.go:42 +0x49
runtime.sigpanic()
        /usr/local/go/src/runtime/sigpanic_unix.go:24 +0x2ba

latortuga

drew:~/projects/prj$ zeus start
Starting Zeus server v0.15.5.rc1
[ready] [crashed] [running] [connecting] [waiting]
boot
└── default_bundle
    ├── development_environment
    │   └── prerake
    └── test_environment
        └── test_helper

latortuga

def method_name
  state.thing_that_throws
rescue
  state.error
ensure
  state.thing
  state
end

latortuga

<%= CSV.generate do |csv| %>
  <% csv << ["All Orders"] %>
  <% csv << [] %>
  <% total = 0.0 %>
  <% orders.each do |order| %>
    <% csv << [order.id, order.subtotal, order.tax, order.shipping, order.total] %>
    <% total += order.total %>
  <% end %>
  <% csv << [] %>
  <% csv << ["Total", total] %>

latortuga

Run tests via Minitest how it's supposed to work

# manual way
Minitest.run(args)

# magic way
require 'minitest/autorun'
# or
Minitest.autorun

latortuga

# Imagine we have a form that only sets user name for verified users
class Form
  include ActiveModel::Model

  attr_accessor :name

  def save(user)
    user.name = name if user.verified?
  end
end

latortuga

require 'active_record'
ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Schema.define do
  create_table :somethings, force: true do |t|
    t.integer :age
    t.integer :count
  end
end

class Something < ActiveRecord::Base

latortuga

$ ruby poodr.rb 
poodr.rb:20:in `prepare_trip': undefined method `each' for nil:NilClass (NoMethodError)
        from poodr.rb:6:in `block in prepare'
        from poodr.rb:5:in `each'
        from poodr.rb:5:in `prepare'
        from poodr.rb:54:in `<main>'

latortuga

Notes

This is the latest version of an email which I send periodically, offering customers the opportunity to pre-pay for SaaS in return for a discount. The benefits to the SaaS company are better cash flow and reduced churn rate. The benefits to the customer are, well, in the email. This genre of email has produced hundreds of thousands of dollars in pre-pays for some companies I work with, and it rarely requires any more work than this example.

I've put $79 is as a placeholder for the cost of the user's plan. We calculate that for each account, naturally, along with the billing contact's name.

Subject: Save $79 on Appointment Reminder (and get a tax write-off) Formatting: 100% plain text. Gmail automatically links up the central link. From: Patrick McKenzie (Appointment Reminder) patrick@appointmentreminder.org