RoR: NoMethodError when executing delete_all for a has_many relationship

Question

My classes are as follows, with Customer inheriting from User using the single-table inheritance approach. User has attributes name and email while Order has destination.

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Answer 1

This is the Rails issue with Ruby 2.2.2: https://github.com/rails/rails/issues/18991 . It's closed and fixed in 3.2.22).