reusing structs in another struct in golang

Question

I have two structs in golang as below

type Data struct {
    Name          string
    Description   string
    HasMore   bool
}

type DataWithItems struct {
    Name          string
    Description   string
    HasMore      bool
    Items    []Items
}

At most DataWithItems struct can be rewritten as

 type DataWithItems struct {
        Info Data
        Items []Items
    }

But the above make it difficult when decoding a json object into DataWithItems. I know this can be solved with inheritance in other programming languages but Is there a way I can solve this in Go?

poy · Accepted Answer · 2018-11-28 21:50:15Z

3

You can "embed" the one struct into the other:

type Items string

type Data struct {
    Name        string
    Description string
    HasMore     bool
}

type DataWithItems struct {
    Data // Notice that this is just the type name
    Items []Items
}

func main() {
    d := DataWithItems{}
    d.Data.Name = "some-name"
    d.Data.Description = "some-description"
    d.Data.HasMore = true
    d.Items = []Items{"some-item-1", "some-item-2"}

    result, err := json.Marshal(d)
    if err != nil {
        panic(err)
    }

    println(string(result))
}

this prints

{"Name":"some-name","Description":"some-description","HasMore":true,"Items":["some-item-1","some-item-2"]}

answered Nov 28, 2018 at 21:50

poy

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2 Comments

Henry Over a year ago

You can also reference the fields of Data in DataWithItems directly as long as there are no name conflicts. For example d.Name works.

poy Over a year ago

@HenryWoody Very true! I can never tell which I prefer for readability.

Kenny Grant · Accepted Answer · 2018-11-28 21:45:46Z

0

Just use one struct - DataWithItems and sometimes leave items blank

answered Nov 28, 2018 at 21:45

Kenny Grant

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