Factory Girl study

factory_girl_check.rb

require 'factory_girl'

# Build does not go through initializer :(
# class Receiver
#   attr_reader :calls
#   def initializer
#     @calls = []
#   end
#   def a=(arg)
#     @calls << arg
#   end
#   def b=(arg)
#     @calls << arg
#   end
# end

class Receiver
  def calls
    @calls ||= []
  end
  def a=(arg)
    calls << arg
  end
  def b=(arg)
    calls << arg
  end
  def c=(arg)
    calls << arg
  end
  def x=(arg)
    calls << arg
  end
  def y=(arg)
    calls << arg
  end
  def z=(arg)
    calls << arg
  end
end

FactoryGirl.define do
  factory :receiver do
    a 0
    b :B
    x 1
    y :Y
  end

  factory :receiver_alt, :class => Receiver do
    a 0
    x 1
    b :B
    y :Y
  end
end

#
# Assignment order is determined for declared attributes.  Not guaranteed for
# undeclared attributes.
#

# [:A, :B, :X, :Y, :Z, :C]
10.times do
  r = FactoryGirl.build(:receiver, :a => :A, :c => :C, :x => :X, :z => :Z)
  puts r.calls.inspect
end

# [:A, :X, :B, :Y, :Z, :C]
10.times do
  r = FactoryGirl.build(:receiver_alt, :a => :A, :c => :C, :x => :X, :z => :Z)
  puts r.calls.inspect
end