gistfile1.rb

NotificationSubscription.where(confirmed: true)
                                   .joins(property: :feedback_inputs)
                                   .where("feedback_inputs.created_at >= :cutoff", {cutoff: 1.hour.ago})

Is there a way to make :cutoff dynamic, depending on a column in NotificationSubscription?

So {cutoff: NotificationSubscription.last_email_sent_at}

Well right now you have no tie to a user - is that what you're asking about?

NotificationSubscription.where(confirmed: true)
.joins(property: :feedback_inputs)
.where("feedback_inputs.created_at >= :cutoff", {cutoff: {notification_subscription: :last_email_sent_at}})