What is causing this ActiveRecord::ReadOnlyRecord error?

Question

This follows this prior question, which was answered. I actually discovered I could remove a join from that query, so now the working query is

start_cards =          


        

Answer 1

To deactivate it...

module DeactivateImplicitReadonly
  def custom_join_sql(*args)
    result = super
    @implicit_readonly = false
    result
  end
end
ActiveRecord::Relation.send :include, DeactivateImplicitReadonly