Sharp corner in usage with FactoryBot

[smudge]

Given this state machine:

steady_state :status do
  state 'active', default: true
  state 'inactive', from: 'active'
end

We discovered that a factory will be invalid if it explicitly sets the "active" state in the default factory:

# factory
status { "active" }

# usage
FactoryBot.create(:my_factory)
#!> ActiveRecord::RecordInvalid: Validation failed: Status is invalid

FactoryBot.create(:my_factory, status: 'active')
#!> ActiveRecord::RecordInvalid: Validation failed: Status is invalid

FactoryBot.create(:my_factory, status: 'inactive')
#!> works

The fix is to remove the status { "active" } from the factory

[kylenakano]

Looks like the fix only works if the factory status has the default status included in the from param when defining status. For example:

steady_state :status do
  state 'active', default: true
  state 'inactive', from: 'active'
  state 'canceled', from: 'inactive'
end

FactoryBot.create(:my_factory, status: 'canceled')
#!> ActiveRecord::RecordInvalid: Validation failed: Status is invalid

Any recommendations to workaround this case?

[smudge]

Any recommendations to workaround this case?

Circling back after resolving this offline -- it turns out that #6 was the culprit here. There may be something we can do to detect default values on columns and warn the developer.