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# Class Question::MultipleChoice is a simple, closed-ended question type that lets respondents select one or multiple
# answers from a defined list of choices.
#
# @example Definition
#    question = Question::MultipleChoice.new("Reference doesn't seem to be regular release. MAKE A BUILD?")
#      .choice(:build,   'b', '[b]uild')
#      .choice(:install, 'i', '[i]nstall and build')
#      .choice(:clean,   'c', '[c]lean install and build')
#      .choice(:skip,    's', '[s]kip')
#      .choice(:quit,    'q', '[q]uit')

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class JSONArray

  attr_accessor :object_class, :serializer_class

  def initialize(object_class, serializer_class = nil)
    @object_class = object_class
    @serializer_class = serializer_class || object_class.new.active_model_serializer
  end

  def dump(arr)

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class Result
  include StatusFactory.new(:create, :update, :delete, :identical, callbacks: true)
end

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class Comment < ApplicationRecord
  default_scope -> { where(deleted_at: nil) }

  def soft_delete
    update(deleted_at: Time.current)
  end
end

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class CastingStruct < Struct
    def self.new(hash, &blk)
        super(*hash.keys) do
            define_method :initialize do |*args|
                super *hash.values.map { |method|
                    args.shift.public_send method
                }
            end
            class_eval(&blk) if blk
        end

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# Class FeatureFlag defines and stores feature flags
#
# @see http://blog.arkency.com/2015/11/simple-feature-toggle-for-rails-app/
#
class FeatureFlag
  def initialize
    @flags = {}
    yield self if block_given?
  end

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This list is based on aliases_spec.rb.

You can see also Module: RSpec::Matchers API.

matcher	aliased to	description
a_truthy_value	be_truthy	a truthy value
a_falsey_value	be_falsey	a falsey value
be_falsy	be_falsey	be falsy
a_falsy_value	be_falsey	a falsy value

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require 'open-uri'

# Net::HTTP.get(uri) does't work for binary files. File gets corrupted.
#
# File is opended in binary write mode "wb". The "open" method is  provided
# by open-uri and is considered unsafe for user input! The "rb" stands for
# binary read mode.
#
# IO.copy_stream does not load the whole file in memory.
#

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An incomplete cheatsheet for rails 3. Things are added as they are required.

## Debugging

Check errors

@user = User.new(:email => email)
puts @user.valid?
@user.errors.each { |e| puts "#{e}: #{@user.errors[e]}" }

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require 'slim'
require 'benchmark/ips'

Benchmark.ips do |x|
  x.report("pure slim") { Slim::Template.new('template_slim.slim').render }
  x.report("slim with markdown") { Slim::Template.new('template_md.slim').render }
  x.compare!
end