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

Try updating you Customer class association with

has_many :orders, :dependent => :destroy

or

has_many :orders, :dependent => :delete_all

Depending on what you want to achieve.

:destroy causes all the associated objects to also be destroyed.

:delete_all causes all the associated objects to be deleted directly from the database without executing callbacks.