Method setKeys

src/model.js:3759–3766

        // Loop and call set
        if (options.attributes) {
          const setKeys = data => {
            for (const k of data) {
              if (values[k] === undefined) {
                continue;
              }
              this.set(k, values[k], options);
            }
          };
          setKeys(options.attributes);
          if (this.constructor._hasVirtualAttributes) {
            setKeys(this.constructor._virtualAttributes);