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# Call ActiveRecord::base.forbid_implicit_checkout_for_thread! from a thread, and if
# that thread later tries to access an active record connection without explicit checkout
# (#with_connection, or #checkout), an ImplicitConnectionForbiddenError will be raised. 

module ActiveRecord
  class Base
    class << self
      def forbid_implicit_checkout_for_thread!
        Thread.current[:active_record_forbid_implicit_connections] = true
      end