A colleague of mine proposed an idea for a new syntax for instantiating object in #rails:

User.create! do
  nickname = 'makaroni4'
  email = 'my_email@gmail.com'
end

As you can see there is no variable passed to a block and there is no context (self etc) inside the block. Is it possible? Under the cut there is an explanation of this case and implementation of similar syntax. More under the cut

class User < ActiveRecord::Base
  has_many :friends, class_name: :Buddy
end

u = User.new
klass = u.association(:friends).klass
klass # => Buddy

#metaprogramming #ruby #rails

#Bash? #Metaprogramming? WTF? Turns out, bash's everything-is-a-string philosophy makes it pretty awesome for metaprogramming. More under the cut

In this post I will show how to redefine attr_reader method to have default value.

It will be more abstract solution than common:

def some_variable
  @some_variable || 'default_value'
end

More under the cut

Don't forget that self.included method in module is executed in the end:

module Gangster
  def self.included(base)
    puts "Inside self.included"
  end

  puts "Outside self.included"
  def shoot
    puts "Tra ta ta ta ta!"
  end
end

class Human
  include Gangster
end

# => Outside self.included
# => Inside self.included

More under the cut

Basically this is dynamic monkey patch of all instance_methods. More under the cut