➜  sequel git:(master) ✗ ./moi.rb
/var/lib/gems/2.3.0/gems/sequel-4.45.0/lib/sequel/model/base.rb:2416:in `block in set_restricted': method content= doesn't exist (Sequel::MassAssignmentRestriction)
	from /var/lib/gems/2.3.0/gems/sequel-4.45.0/lib/sequel/model/base.rb:2403:in `each'
	from /var/lib/gems/2.3.0/gems/sequel-4.45.0/lib/sequel/model/base.rb:2403:in `set_restricted'
	from /var/lib/gems/2.3.0/gems/sequel-4.45.0/lib/sequel/model/base.rb:1793:in `set'
	from /var/lib/gems/2.3.0/gems/sequel-4.45.0/lib/sequel/model/base.rb:2359:in `initialize_set'
	from /var/lib/gems/2.3.0/gems/sequel-4.45.0/lib/sequel/model/base.rb:1381:in `initialize'
	from ./moi.rb:23:in `new'
	from ./moi.rb:23:in `add'
	from ./moi.rb:30:in `<main>'