Today I Learned

hashrocket A Hashrocket project

Change creation strategy in FactoryBot

I found out that's possible to change the FactoryBot strategy by invoking the to_create method inside the factory definition.

We had to do that to make factory bot linting to work on a factory that acts like an enum. So we did something like this:

FactoryBot.define do
  factory :role do
    to_create do |instance|
      instance.attributes = instance.class
        .find_or_create_by(slug: instance.slug)

      instance.instance_variable_set(:@new_record, false)

The said part here is that FactoryBot expects us to mutate that instance in order to work.

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