How can I get a unique 2d nested array based on a specific index of that 2d array?
Basically, I want to show the unique names that belong to a certain associated model, in the dropdown list. Here is what the query looks like
Product.where(live: true).includes(:primary_concern).map{|q| [q.primary_concern.name, q.id]}
but it returns all the names while I want only unique names to show in the dropdown list.
I tried to use rails group by, but it is throwing undefined table error because primary_concern is not a model itself, its an association to a model let say concern, with a different foerign_key name
