nil_fail_test.rb

require 'test_helper'
require 'virtus'
require 'representable/json'
 
class NilFailTest < MiniTest::Spec
  class Company
    include Virtus.model
 
    attribute :name, String
    attribute :errors, Hash, default: nil
  end
 
  module CompanyRepresenter
    include Representable::JSON
 
    property :name
    property :errors, render_nil: true
  end
 
  describe "After representing a nil value" do
    it "representation should still work on subsequent attempts" do
      first_company_without_errors = Company.new name: 'I will work because nil has not been represented'
      CompanyRepresenter.represent(nil).to_hash rescue nil
      # If `errors` is present the representation will work
      company_with_errors = Company.new(name: 'I will work because I have non-nil errors', errors: {})
      CompanyRepresenter.represent(company_with_errors).to_hash
      
      # This line will fail. It looks like it has to do with `errors` being nil, 
      # and then trying to set a default value that is nil.
      company_without_errors = Company.new name: 'I will fail because my errors default is used'
      CompanyRepresenter.represent(company_without_errors).to_hash
    end
  end
 
end