Custom how nested struct marshals
FX-HAO opened this issue · comments
A use case: I want to marshal my nested struct to be a json-formated string instead of map[string]interface{}
I think this issue fits nicely into why i had to fork this library as well, i wonder if you could say something about whether you see this library support something like the PR #118 contains @fatih ? My main issue is that nested structs either get ignored, or unmarshalls all of it's children instead of adding the option to evaluate it to a single field.
I have seen suggestions to use the structs:",string"
which will use the stringer interface on the struct calling the method String()
If i owned all of the structs i wanted to call the Values(interface{})
method on, it would be no problem, but if we take sql.NullString
as an example the suggestion would be to do a type alias like
type SQLNullString sql.NullString
type Bar struct {
SomeString SQLNullString `structs:",string"`
}
func (sns *SQLNullString) String() string {
return sns.String()
}
This code has a error because sql.NullString
already has a public field String
so you cannot create a String()
method on it's type alias.
In our fork omnioiot/structs
we changed the Values() method to have something like this for the sql.NullX
, in this case just the sql.NullString as an example:
if tagOpts.Has("nullstring") {
sqlNullString, ok := val.Interface().(sql.NullString)
if ok {
value, err := sqlNullString.Value()
if err == nil {
t = append(t, value)
} else {
panic(err)
}
}
continue
}
I think that @FX-HAO has a PR #118, but as i commented on that PR it doesn't seem to work on structs, only maps.
Hi,
Unfortunately, I'm archiving this project and will no longer maintaining it. For more information, please read my blog post: Taking an indefinite sabbatical from my projects.
Thanks for the feedback and contribution.