thoughtbot--factory_bot/lib/factory_girl/step_definitions.rb

module FactoryGirlStepHelpers
  def convert_ast_table_to_attribute_hash(table)
    table.rows.inject({}) do |result, (human_key, value)|
      key = human_key.downcase.gsub(' ', '_').to_sym
      result.merge(key => value)
    end
  end

  def convert_human_hash_to_attribute_hash(human_hash)
    human_hash.inject({}) do |attribute_hash, (human_key, value)|
      key = human_key.downcase.gsub(' ', '_').to_sym
      attribute_hash.merge(key => value)
    end
  end
end

World(FactoryGirlStepHelpers)

Factory.factories.values.each do |factory|
  Given "the following #{factory.human_name} exists:" do |table|
    attributes = convert_ast_table_to_attribute_hash(table)
    Factory.create(factory.factory_name, attributes)
  end

  Given "the following #{factory.human_name}s exist:" do |table|
    table.hashes.each do |human_hash|
      attributes = convert_human_hash_to_attribute_hash(human_hash)
      Factory.create(factory.factory_name, attributes)
    end
  end
end