Factory_bot: Replacement for Deprecated `initialize_with` Functionality

[mintyfresh]

Problem this feature will solve

According to these release notes, the initialize_with { ... } is being deprecated and no replacement has been documented:
https://github.com/thoughtbot/factory_bot/releases/tag/v5.2.0

We currently use FactoryBot to instantiate many non-ActiveRecord objects throughout our test suite. Many of these objects are frozen upon construction, or simply do not expose any attribute writers.

For example, see Dry::Struct:
https://dry-rb.org/gems/dry-struct/1.0/

Given some Dry::Struct object, we may have a factory such that:

factory :some_struct, class: 'SomeStruct' do
  skip_create

  initialize_with { new(attributes) }

  # Attributes...
end

This allows us to construct these objects for use in our test suite, as all attributes need to be passed into the constructor.

Desired solution

A replacement for the existing initialize_with { ... }.

If a replacement has already been implemented, it would be best to have a documented upgrade/refactor path.

Alternatives considered

Retain public access to existing initialize_with { ... } hook.

Another possible solution is some sort of DSL to indicate that attributes should be sent to the constructor, however, this is far more restricted in its usefulness.

[composerinteralia]

Thanks for the issue @Mihail-K!

The intention here was only to deprecate the method on the top-level FactoryBot module:

FactoryBot.initialize_with

If you are seeing a deprecation warning for this code:

factory :some_struct, class: 'SomeStruct' do
  skip_create

  initialize_with { new(attributes) }

  # Attributes...
end

then that is a bug and should be fixed.

[composerinteralia]

I added https://github.com/thoughtbot/factory_bot/commit/5ba893831b24515d5328ed65b91f603ac462f83d to clarify what was deprecated. Hopefully that helps.

[mintyfresh]

Oh, sorry about the confusion. Thank you for clarification!