find_or_create for FactoryBot

factory_bot.rb

# initializers/factory_bot.rb

# This needs to be extended in any factory you want its methods in, e.g.:
# factory :my_factory do
#   extend FactoryBotEnhancements
#   change_factory_to_find_or_create
# end
# FactoryBot.create(:my_factory) # creates with default attributes
# FactoryBot.create(:my_factory) # finds with the same default attributes

module FactoryBotEnhancements
  def change_factory_to_find_or_create
    # Note that this will ignore nil value attributes, to avoid auto-generated attributes such as id and timestamps
    to_create do |instance|
      attributes = instance.class.find_or_create_by(instance.attributes.compact).attributes
      instance.attributes = attributes.except('id')
      instance.id = attributes['id'] # id can't be mass-assigned
      instance.instance_variable_set('@new_record', false) # marks record as persisted
    end
  end
end