Suppose we have the following go code
type SectionType int
const (
Header SectionType = iota
Footer
Body
)
var sectionTypeNames = map[string]SectionType{
"header": Header
"footer": Footer
"body": Body
}
type Page struct {
Sections: []SectionType `yaml:"sections"`
}
And we have the following yaml
page1:
- header
- body
Is there a way to get goyaml to convert the strings of "header" and "body" into their respective int constant types (as defined in sectionTypeNames
map) we deserializing the Page
struct?
go-yaml
can't do it automatically because it can only see what package reflect
exposes about types, and that doesn't include the names of constants in a package. There isn't really a notion of packages from reflect
's perspective at all.
It sounds like you're willing to do it yourself (you've already made a map
, etc). So I think what you can do is make SectionType
or *[]SectionType
an Unmarshaler
, by providing a function that turns the strings the YAML package decodes into values; I lack the specific experience with go-yaml
to be able to tell you exactly how to implement it, but in general that's what interfaces like Unmarshaler
do.
If this is something you run into often enough, it might be worthwhile writing something along the lines of stringer
to generate the maps and deserialization functions for you (by inspecting the source files that define the types). There have to be a lot of types before that's worthwhile though.