class SomeController
  def create
    ProceedingHistory.transaction do
      begin
        ProceedingHistory.create(proceeding_id: proceeding_id)
      rescue ActiveRecord::RecordNotUnique
        head :bad_request
        return
      end

      do_something
    end

    head :ok
  end
end

# == Schema Information
#
# Table name: proceeding_histories
#
#  id              :bigint           not null, primary key
#  created_at      :datetime
#  proceeding_history_id :string(255)
#
# Indexes
#
#  index_proceeding_histories_on_proceeding_history_id  (proceeding_history_id) UNIQUE
#

class ProceedingHistory < ApplicationRecord
end

Original by Github issue

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