text: exports.seed = function(knex) {
    return knex('ratings').truncate()
      .then(() => {
        return knex('ratings').insert([
          { rating: 'E' },
          { rating: 'E 10+' },
          { rating: 'T' },
          { rating: 'M' },
          { rating: 'Ao' },
          { rating: 'RP' }
        ])
      })
  };
  