FactoryGirl strategy for adding find & find_or_create

factory_girl_strategy_find_or_create.rb

## http://stackoverflow.com/questions/7145256
module FactoryGirl
  module Strategy
    class Find
      def association(runner)
        runner.run
      end

      def result(evaluation)
        build_class(evaluation).where(get_overrides(evaluation)).first
      end

      private

      def build_class(evaluation)
        evaluation.instance_variable_get(:@attribute_assigner).instance_variable_get(:@build_class)
      end

      def get_overrides(evaluation = nil)
        return @overrides unless @overrides.nil?
        evaluation.instance_variable_get(:@attribute_assigner).instance_variable_get(:@evaluator).instance_variable_get(:@overrides).clone
      end
    end

    class FindOrCreate
      def initialize
        @strategy = FactoryGirl.strategy_by_name(:find).new
      end

      delegate :association, to: :@strategy

      def result(evaluation)
        found_object = @strategy.result(evaluation)

        if found_object.nil?
          @strategy = FactoryGirl.strategy_by_name(:create).new
          @strategy.result(evaluation)
        else
          found_object
        end
      end
    end
  end
  
  register_strategy(:find, Strategy::Find)
  register_strategy(:find_or_create, Strategy::FindOrCreate)
end

but, how to use this.? where import it?

Late to the game, but...
Defining a strategy like this automatically allows you to use it everywhere you'd normally use create or build or build_stubbed. The calls to register_strategy are what do this. In other words, if you require this in your spec_helper.rb, you'll be able to do things like:

extend FactoryGirl::Syntax::Methods
require "factory_girl_strategy_find_or_create.rb"

user = find_or_create(:user, username: "mklbtz")

factory(:user) do
  # ...
  after(:find_or_create) do
    # ...
  end
end

This is great, except it doesn't work with traits

For gem version 4.8.2 onwards the snippet should reference to FactoryBot.

Super helpful 👍 thanks

Thanks!