ContainerHQ/arkis-api

'use strict';

let _ = require('lodash');

module.exports = function({ attribute, scope }) {
  let scopeId = `${scope}_id`,
    error     = `${_.capitalize(attribute)} must be unique`;

  if (!!scope) { error = `${error} per ${scope}`; }

  return {
    isUnique: function(value) {
      if (!value) { return Promise.resolve(); }

      let models  = require('../../models'),
        modelName = this['$modelOptions'].name.singular,
        criterias = _(this)
          .pick(scopeId, attribute)
          .merge({ id: { $ne: this.id } })
          .value();

      return models[modelName].findOne({ where: criterias }).then(result => {
        if (result) { return Promise.reject(`${error}.`); }
      });
    }
  };
};