The current order leads to an error on the route
GET /conferences/:short_name/physical_tickets
The Rails error message was rather helpful! 😁
```
Completed 500 Internal Server Error in 35ms (ActiveRecord: 12.0ms)
ActiveRecord::HasManyThroughOrderError (Cannot have a has_many :through association 'Conference#physical_tickets' which goes through 'Conference#ticket_purchases' before the through association is defined.):
app/controllers/admin/physical_tickets_controller.rb:11:in `index'
```
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