How to define struct with defined properties that is also a map

[David Karr]

This is probably basic, but I'm working on some code that unmarshals JIRA tickets (just for some context). Examining the Json output, there is a big "fields" object that mostly contains custom fields, but also some defined fields. Right now, I defined "Fields" as a "map[string]any", which is appropriate for the custom fields. However, I would really like to define something like this:

    type JIRAFields struct {

        map[string]any

        Parent JIRAParent

    }

    type JIRAParent struct {

        ...

    }

So I could reference a custom field like "Fields[key]", but the parent field with "Fields.Parent".

I'm certain the syntax I have so far isn't correct, as it flags the "map" saying "}" was expected.

[burak serdar]

The current json implementation in the stdlib does not support a
catchall like that. Also, you cannot embed a map in a struct.

You can replace JIRAFields with a map[string]any. If there are keys
with known structures, you can do a map[string]json.RawMessage, and
then you can do json.Unmarshal(fields[knownKey],&knownStruct) for
those keys whose structure you know.

Alternatively, you can use a map[string]any, and use the mapstructure
library to unmarshal a map[string]any to a known struct.

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[twp...@gmail.com]

Also, quick plug for

  https://github.com/twpayne/go-jsonstruct

which will generate type-safe Go structs for you for all fields. Just throw a bunch of JIRA JSON responses at it.

Regards,

Tom