Generator#pk_type: rbs_rails:generate_rbs_for_models fails with composite primary key model

[casaper]

Error description

In my project, the rbs_rails:generate_rbs_for_models task fails with my model that has a composite primary key.

It happens with rbs_rails: v0.12.1

Error thrown

NoMethodError with message undefined method 'type' for nil.

Where exactly

RbsRails::ActiveRecord::Generator#pk_type in lib/rbs_rails/active_record.rb:60

pk is at this point ["year", "user_id"] when klass is UserHolidayYear.

      private def pk_type
        pk = klass.primary_key
        return 'top' unless pk

        # pk => `["year", "user_id"]` when `klass.name == 'UserHolidayYear'`
        col = klass.columns.find {|col| col.name == pk }
        sql_type_to_class(col.type)
      end

My model

class UserHolidayYear < ApplicationRecord
  self.primary_key = %i[year user_id]
  # ...
  belongs_to :calendar_year,
             foreign_key: :year,
             primary_key: :year,
             inverse_of: :user_holiday_years
  belongs_to :user
  # ...
end

class CalendarYear < ApplicationRecord
  self.primary_key = :year
  # ...
end

ActiveRecord::Schema[8.0].define(version: 2025_02_06_152444) do
  # ...
  create_table "user_holiday_years", id: false, force: :cascade do |t|
    t.integer "year"
    t.bigint "user_id", null: false
    # ...
    t.index ["year", "user_id"], name: "index_user_holiday_years_on_year_and_user_id", unique: true
  end
  # ...
end