code: def query_count():
          '''
          The count of post2tag.
          '''
          recs = TabPost2Tag.select(
              TabPost2Tag.tag_id,
              peewee.fn.COUNT(TabPost2Tag.tag_id).alias('num')
          ).group_by(
              TabPost2Tag.tag_id
          )
          return recf query_count():
          '''
          The count of post2tag.
          '''
          recs = TabPost2Tag.select(
              TabPost2Tag.tag_id,
              peewee.fn.COUNT(TabPost2Tag.tag_id).alias('num')
          ).group_by(
              TabPost2Tag.tag_id
          )
          return recs
docs: The count of post2tag.