encoding/json: empty time.Time serialized even though omitempty is specified

[Ondřej Kupka]

Hi,

I basically have a struct looking like

type Foobar struct {

    t time.Time `json:"omitempty"`

}

Now when I do

var fb Foobar

and then try to serialize it, I get "t":"0001-01-01T00:00:00Z" instead of "t" being absent.

So I am just wondering it if makes sense to expect this to work or not.

time.Time implements the JSON interfaces, so I was expecting this to work.

Cheers,

Ondrej

[Denis Bakhtin]

It is absent :) http://play.golang.org/p/4qwl_njvSS

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[Nate Brennand]

@Denis, in your playground link you don’t make the attribute T exposed. The attribute must be exposed for the field to ever be marshaled into JSON. Also, omitempty must be used after a comma to denote that it’s a property, not the name of the field.
Here’s an updated example: http://play.golang.org/p/Jour5HAKEe

Your best bet seems to be making the T attribute a pointer, it will be nil when uninstantiated.
http://play.golang.org/p/ud6OLZUrmY

​

[Denis Bakhtin]

@Nate, right you are, was inattentive :) thank you.

[Ian Davis]

 

On Tue, Sep 9, 2014, at 01:24 PM, Ondřej Kupka wrote:

and then try to serialize it, I get "t":"0001-01-01T00:00:00Z" instead of "t" being absent.

 

See issue 4357 https://code.google.com/p/go/issues/detail?id=4357

 

Ian