无法整理YAML结构

Question

I have what I think is a very straightforward YAML structure I'm attempting to write to and read from a file.

appName:
   version: 1.2.3.4
   md5_checksum: 987654321

And I'm really struggling to understand nested structs and how they relate to yaml marshaling.

At this point I have the following:

type Application struct {
    Name     string `yaml:"application"`
    Version  string `yaml:"version"`
    Checksum int    `yaml:"md5_checksum"`
}

yamlData := Application{"MyProgram", "1.2.3.4", 34235234123}
y, err := yaml.Marshal(yamlData)
if err != nil {
    log.Fatal("Yaml marshal failed")
}

err = ioutil.WriteFile("applications.yaml", y, 0644)
if err != nil {
    log.Fatal("File write failed")
}

This gets me close, but the file reads as follows:

application: MyProgram
version: 1.2.3.4
md5_checksum: 34235234123

That looks nice, but this file will be populated by many applications. I've tried a few types of nested structs, but I get hung up on how to supply values to them when finally building them.

Answer 1

I've solved my own problem with help from KibGzr.

No structs necessary just for the marshaling steps.

yamlData := map[string]map[string]string{
    appName: map[string]string{"version": appVersion, "md5_checksum": checksumString},
}

I've created a nested map rather than a struct. This allows me just initialize the map when I've collected all my values rather than trying to work around struct field names. My output is now:

appName:
  md5_checksum: checksumString
  version: appVersion

Thanks for all the help!