Gophers, how do I json.Marshal the output in my json

Question

Gophers, how do I json.Marshal the output in my json

of a struct array with no value?
out:
{"code":"","a":null}
but I would like to do this
{"code":"","a":[{"id":"","name":""}]}

type A struct {
ID string json:"id"
Name string json:"name"
}

type B struct {
Code string json:"code"
A []A json:"a"
}

0

26.03.2022

12 ответов

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jeffotoni Автор вопроса

Roman Sharkov
how are you expecting a non-empty array when the s...

all empty, I need to mount the empty struct json. I'm seeing your customize the MarshalJSON

0

26.03.2022

jeffotoni Автор вопроса

golang's stdlib encoding/json library currently marshals empty arrays as null rather than []

0

26.03.2022

jeffotoni Автор вопроса

do you know a way around? I'm not finding any other solution than to declare the structure and append something empty to make it work 😔😔

0

26.03.2022

jeffotoni Автор вопроса

Roman Sharkov
how are you expecting a non-empty array when the s...

The simplest solution I found was to make an append even empty so that Go does the allocation and thus the json of the output. b.A = append(b.A, a) {"code":"","a":[{"id":"","name":""}]}

0

26.03.2022

Roman Sharkov

jeffotoni
do you know a way around? I'm not finding any othe...

https://go.dev/play/p/OW3MJNwjwE-

0

26.03.2022

jeffotoni Автор вопроса

Roman Sharkov
https://go.dev/play/p/OW3MJNwjwE-

in your example I will always receive like this Foo{X: nil} so I always need to test if it's nil and if I need to tell Go that I want to print its struct .

0

26.03.2022

Roman Sharkov

jeffotoni
in your example I will always receive like this Fo...

can you create a playground example? I honestly don't understand the problem

0

26.03.2022

jeffotoni Автор вопроса

Roman Sharkov
can you create a playground example? I honestly do...

https://go.dev/play/p/0kQ68cX7n3c

0

26.03.2022