CODEWITHSUNDEEP
jsongostructunmarshalling
Daniel
Daniel

Reputation: 3040

How to unmarshal json to struct with uint8

How do you unmarshal json into struct that contains a uint8? I am getting the error message json: cannot unmarshal object into Go struct field A.test of type uint8

In my struct I have 

type A struct {
    Test  uint8  `json:"test omitempty" bson:"test"`
}

I inserted struct A into mongo and then I successfully do a mongo find and print out the collection struct A corresponds to. I can do a bson.MarshalExtJSON to convert the bson to json and then when I do a json.Unmarshal to convert json to struct A that is where I am failing.

Here is a sample golang playground that recreates the issue. I don't understand why this fails? How do I fix it?

https://play.golang.org/p/0HOAxsu166j

I see that unmarshal uses "float64, for JSON numbers" but I can't get float64 rather than uint8 to work either

Upvotes: 0

Views: 1595

Answers (1)

Daniel
Daniel

Reputation: 3040

Thanks to @Brits comment, I found that when I called bson.MarshalExtJSON I got extendedJson. json.Unmarshal() cannot read extendedJson like {"$numberInt":"52"} so that is why it was failing.

so to solve it I am using bson.UnmarshalExtJSON() rather than json.Unmarshal() to be able to unmarshal the extendedJSON into the struct

Upvotes: 0

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