Fix NoMethodError for ActiveRecord 7.1.2 in when running rails generate shortener

[jonathandean]

Running rails generate shortener on ActiveRecord 7.1.2 produces a NoMethodError:

~/.rvm/gems/ruby-3.2.2@maitre-d/gems/activerecord-7.1.2/lib/active_record/dynamic_matchers.rb:22:in `method_missing': undefined method `timestamped_migrations' for ActiveRecord::Base:Class (NoMethodError)
	from ~/.rvm/gems/ruby-3.2.2@maitre-d/gems/shortener-1.0.1/lib/generators/shortener/shortener_generator.rb:12:in `next_migration_number'
	from ~/.rvm/gems/ruby-3.2.2@maitre-d/gems/railties-7.1.2/lib/rails/generators/migration.rb:43:in `set_migration_assigns!'
	from ~/.rvm/gems/ruby-3.2.2@maitre-d/gems/railties-7.1.2/lib/rails/generators/migration.rb:59:in `migration_template'
	from ~/.rvm/gems/ruby-3.2.2@maitre-d/gems/shortener-1.0.1/lib/generators/shortener/shortener_generator.rb:20:in `create_migration_file'

This was resolved by replacing ActiveRecord::Base.timestamped_migrations with ActiveRecord.timestamped_migrations

[fschwahn]

Do you know in which rails versions this is supported? The generator is not covered by tests, so we cannot rely on that. Backwards compatible alternative would be:

if ActiveRecord.respond_to?(:timestamped_migrations) ? ActiveRecord.timestamped_migrations : ActiveRecord::Base.timestamped_migrations

Or you could try writing a spec for the generator (maybe this is supported all the way back to rails 4.2)

[fschwahn]

I cherry-picked your changes into #168 and merged them. Thank you for your contribution.

[dsheard]

Still getting this issue, has it been released in version 1.0.1?

[fschwahn]

No, this has not been released yet. @jpmcgrath the generator of the current released version is incompatible with rails 7.1 - can you release a new version?