Function createChangeObject

lib/persisted-model.js:1920–1967

(ctx, type)

    }

    function createChangeObject(ctx, type) {
      const where = ctx.where;
      let data = ctx.instance || ctx.data;
      const whereId = where && where[idName];

      // the data includes the id
      // or the where includes the id
      let target;

      if (data && (data[idName] || data[idName] === 0)) {
        target = data[idName];
      } else if (where && (where[idName] || where[idName] === 0)) {
        target = where[idName];
      }

      const hasTarget = target === 0 || !!target;

      // apply filtering if options is set
      if (options) {
        const filtered = filterNodes([data], options);
        if (filtered.length !== 1) {
          return null;
        }
        data = filtered[0];
      }

      const change = {
        target: target,
        where: where,
        data: data,
      };

      switch (type) {
        case 'save':
          if (ctx.isNewInstance === undefined) {
            change.type = hasTarget ? 'update' : 'create';
          } else {
            change.type = ctx.isNewInstance ? 'create' : 'update';
          }

          break;
        case 'delete':
          change.type = 'remove';
          break;
      }

      return change;
    }

    function removeHandlers() {
      Model.removeObserver('after save', changeHandler);