Function getFromMapField

pkg/data/fields.go:114–130

(field *pb.Field, key string)

}

func getFromMapField(field *pb.Field, key string) (*pb.Field, error) {
	fieldMap := field.GetObject()
	if fieldMap == nil {
		return nil, fmt.Errorf("field '%s' isn't an object, cannot access %s['%s']", field.Key, field.Key, key)
	}

	items := fieldMap.GetItems()
	if items == nil {
		return nil, fmt.Errorf("the object wrapper struct for the value of field '%s' had nil for items, cannot access %s[%s]", field.Key, field.Key, key)
	}

	item, ok := items[key]
	if !ok {
		return nil, fmt.Errorf("no key '%s' in map for field '%s", key, field.Key)
	}
	return item, nil
}

// nextField returns the first field in a fieldpath and returns the remainder after removing the root element.
// It will return array as positive number or 0 if refers to array. If there is no next field, an empty string in field will be returned.