build_insert_sql

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 660
      def build_insert_sql(insert) # :nodoc:
        sql = +"INSERT #{insert.into} #{insert.values_list}"

        if insert.skip_duplicates?
          sql << " ON CONFLICT #{insert.conflict_target} DO NOTHING"
        elsif insert.update_duplicates?
          sql << " ON CONFLICT #{insert.conflict_target} DO UPDATE SET "
          if insert.raw_update_sql?
            sql << insert.raw_update_sql
          else
            sql << insert.touch_model_timestamps_unless { |column| "#{insert.model.quoted_table_name}.#{column} IS NOT DISTINCT FROM excluded.#{column}" }
            sql << insert.updatable_columns.map { |column| "#{column}=excluded.#{column}" }.join(",")
          end
        end

        sql << " RETURNING #{insert.returning}" if insert.returning
        sql
      end