Method add

lib/associations/has-many.js:404–424

* Associate one or more target rows with `this`. This method accepts a Model / string / number to associate a single row, * or a mixed array of Model / string / numbers to associate multiple rows. * * @param {Model} sourceInstance the source instance * @param {Model|Model[]|string[]|stri

(sourceInstance, targetInstances, options = {})

   * @returns {Promise}
   */
  async add(sourceInstance, targetInstances, options = {}) {
    if (!targetInstances) return Promise.resolve();


    targetInstances = this.toInstanceArray(targetInstances);

    const update = {
      [this.foreignKey]: sourceInstance.get(this.sourceKey),
      ...this.scope
    };

    const where = {
      [this.target.primaryKeyAttribute]: targetInstances.map(unassociatedObject =>
        unassociatedObject.get(this.target.primaryKeyAttribute)
      )
    };

    await this.target.unscoped().update(update, { ...options, where });

    return sourceInstance;
  }

  /**
   * Un-associate one or several target rows.