https://play.golang.org/p/WoCO7VGvDE
On Sunday, December 25, 2016 at 6:36:47 AM UTC-7, Forud A wrote:
>
> Hi,
> I have a struct with custom json.MarshallJSON function. I need to ignore
> field of this type when the value is null. something like this
>
> package main
>
> import (
> "encoding/json"
> "fmt"
> )
>
> type Custom struct {
> Name string
> Show bool
> }
>
> type FinalJSON struct {
> T1 *Custom `json:"field,omitempty"`
> T2 string `json:"field2,omitempty"`
> }
>
> func (c *Custom) MarshalJSON() ([]byte, error) {
>
> if !c.Show {
> return nil, nil
> }
>
> return json.Marshal(c.Name)
> }
>
> func main() {
> t1 := &Custom{Name: "c1", Show: true}
> t2 := &Custom{Name: "c2", Show: false}
>
> f1 := FinalJSON{T1: t1, T2: "Sss"}
> f2 := FinalJSON{T1: t2, T2: "Sss2"}
>
> j, err := json.Marshal(f1)
> if err != nil {
> panic(err)
> }
> fmt.Println(string(j))
>
> j, err = json.Marshal(f2)
> if err != nil {
> panic(err)
> }
> fmt.Println(string(j))
>
> }
>
>
> NOTE : this code has a runtime error
>
> if the FinalJSON.T1 = nil then the result is omited from the output, but I
> want to handle it in MarshalJSON function. is there any way to handle this?
> I get the structure from database, and I have a type like pq.NullTime with
> extra MarshalJSON function, when the time is not Valid (.Valid == false), I
> need to remove it from the json output.
>
> thank you
>
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