Today I Learned

A Hashrocket project

Non-ActiveRecord objects in FactoryGirl

Creating non-ActiveRecord objects with FactoryGirl is possible. Classically, a constructor is used to set all the data attributes of an object.

class ParsedString
  attr_reader :abc, :def
  def initialize(string)
    @abc, @def = string.split(?|)

In the above class the attributes are set in the constructor by passing in a string that gets split into two parts on \|. Lets use instantiate_with to determine how the object gets instantiated in FactoryGirl.

factory :parsed_string do
  initial_value "123|456"

  initialize_with { new(initial_value) }

And then in the test we can, like:

ps =
expect( eq 123
expect(ps.def).to eq 456
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