Dynamic field omit/removal/exclude

[brianvoe]

Is their a way to dynamically omit or exclude a field from being output to json.

To give you some context we work with structs and depending on the user type we may not want certain users to see certain fields. It would be nice to simply call a method that adds to an array fields that we would like to exclude before marshaling.

[brianvoe]

I know you probably have a lot of issues to get to. but if i could get any reply on this, that would be great.

Plus if it doesnt exist I would be more than happy to try to integrate it if would be open to accepting it

[AllenX2018]

You can register an extension.

type TestObjectForIssue392 struct {
	DynamicOmitField string
	OtherField       string
}

type OmitFieldExtension struct {
	jsoniter.DummyExtension
}

func (e *OmitFieldExtension) UpdateStructDescriptor(structDescriptor *jsoniter.StructDescriptor) {
	if structDescriptor.Type.String() != reflect.TypeOf(TestObjectForIssue392{}).String() {
		return
	}

	if binding := structDescriptor.GetField("DynamicOmitField"); binding != nil {
		binding.ToNames = []string{}
	}
}

func test() {
	cfg := jsoniter.Config{}.Froze()
	cfg.RegisterExtension(&OmitFieldExtension{})
	if s, err := cfg.MarshalToString(TestObjectForIssue392{"will not marshal", "foo"}); err == nil {
		fmt.Println(s)
		// {"OtherField":"foo"}
	}
}

[renathoaz]

@AllenX2018 how to get value of the field? I mean want to exclude from json depending on value of the field not the name.