src trait.js

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  'use strict';
 
const { LexoRank } = require('lexorank');
class LexoRankTrait {
  register(Model, customOptions) {
    Model.addHook('beforeSave', async (modelInstance) => {
      if (!modelInstance[Model.orderColumn]) {
        const maxRank = await Model.query().getMax(Model.orderColumn);
        modelInstance[Model.orderColumn] = maxRank
          ? LexoRank.parse(maxRank).genNext().toString()
          : LexoRank.middle().toString();
      }
    });
  }
}
 
module.exports = LexoRankTrait;