json marshal one property of struct array

Question

So I have an array of struct Recipe it contains some properties and one of the properties is the struct Source, I want to convert the entire array to json but only the Source property of the Recipe struct

Code: https://play.golang.org/p/E71d4xzNM4

Result:

[
{
    "Id": 1,
    "Title": "Fine Peanutbutter",
    "Description": "The best peanutbutter in the world",
    "Source": {
        "Name": "Peter",
        "Address": "32121 Little Midge"
    },
    "Price": 49
},
{
    "Id": 2,
    "Title": "Fine Jelly",
    "Description": "The best Jelly in the world",
    "Source": {
        "Name": "Peter",
        "Address": "32121 Little Midge"
    },
    "Price": 39
}
]

Wanted Result:

[
{
    "Name": "Peter",
    "Address": "32121 Little Midge"     
},
{
    "Name": "Peter",
    "Address": "32121 Little Midge"
}
]

How do I get this without looping through the entire array and creating a new array struct and doing a json marshal on that one

I have a source struct, what does "Make sure the source json tag is in line." mean ? — user3621898
– user3621898, Commented Sep 10, 2017 at 17:09

Eugene Lisitsky · Accepted Answer · 2017-09-10 17:12:18Z

2

You may define custom marshaller:

func (r Recipe) MarshalJSON() ([]byte, error) {
  return json.Marshal(r.Source)
}

https://play.golang.org/p/xLUAlMllGR

answered Sep 10, 2017 at 17:12

Eugene Lisitsky

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Comments

akond · Accepted Answer · 2017-09-10 17:09:52Z

0

Add this to your source:

func (s Recipe) MarshalJSON() ([]byte, error) {
    return json.Marshal(s.Source)
}

answered Sep 10, 2017 at 17:09

akond

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