Method has

lib/associations/has-many.js:282–315

* Check if one or more rows are associated with `this`. * * @param {Model} sourceInstance the source instance * @param {Model|Model[]|string[]|string|number[]|number} [targetInstances] Can be an array of instances or their primary keys * @param {object} [options] Options passed to getAss

(sourceInstance, targetInstances, options)

   * @returns {Promise}
   */
  async has(sourceInstance, targetInstances, options) {
    const where = {};

    if (!Array.isArray(targetInstances)) {
      targetInstances = [targetInstances];
    }

    options = {
      ...options,
      scope: false,
      attributes: [this.target.primaryKeyAttribute],
      raw: true
    };

    where[Op.or] = targetInstances.map(instance => {
      if (instance instanceof this.target) {
        return instance.where();
      }
      return {
        [this.target.primaryKeyAttribute]: instance
      };
    });

    options.where = {
      [Op.and]: [
        where,
        options.where
      ]
    };

    const associatedObjects = await this.get(sourceInstance, options);

    return associatedObjects.length === targetInstances.length;
  }

  /**
   * Set the associated models by passing an array of persisted instances or their primary keys. Everything that is not in the passed array will be un-associated