Support encoding for nil pointers

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    • Type: Improvement
    • Resolution: Duplicate
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: BSON
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      Encoding a map[string]interface{} contains nil pointer as value or any struct which has nil pointer field causes runtime error.

      type Foo struct {
	Bar *Bar
}
type Bar struct{}

      f := Foo{
	Bar: nil,
}
//  causes "*bsoncodec.StructCodec can only process structs, but got a reflect.Value"
_, err := bson.Marshal(f)
	
m := map[string]interface{}{
	"foo": nil,
}
// causes "cannot perform an encoder or decoder lookup on <nil>"
_, err = bson.Marshal(m)

      To address this problem(maybe a bug?), we should treat nil pointer as BSON null when encoding to BSON, in the same way as json.Marshal() does.

              Assignee:
              Unassigned
              Reporter:
              takumi fujiwara
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                Created:
                Updated:
                Resolved: