find_one(id) private

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# File activerecord/lib/active_record/relation/finder_methods.rb, line 506
      def find_one(id)
        if ActiveRecord::Base === id
          raise ArgumentError,             You are passing an instance of ActiveRecord::Base to `find`.            Please pass the id of the object by calling `.id`..squish
        end

        relation = if klass.composite_primary_key?
          where(primary_key.zip(id).to_h)
        else
          where(primary_key => id)
        end

        record = relation.take

        raise_record_not_found_exception!(id, 0, 1) unless record

        record
      end
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