删除联接表记录时出错

Question

I have a join table named favorites . It doesn't have a single auto incrementing id. It uses both user_id and doctor_id .

My issue is when trying to delete this record. On Rails 5.0 and 5.1 it throws the following error.

favorite = Favorite.first
=> #<Favorite:0x007fe8b1546bf8 user_id: 3, doctor_id: 2, created_at: Wed, 19 Apr 2017 03:37:10 UTC +00:00, updated_at: Wed, 19 Apr 2017 03:37:10 UTC +00:00>
favorite.delete
NoMethodError: undefined method `to_sym' for nil:NilClass

Am I supposed to be deleting this record some other way or is this a bug?

Answer 1

This is a known rails issue. You can find out more detail here .

You have to add primary key in intermediate table check here