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
}
