我如何将BSON文档转换为map [string] interface {}

Question

I was trying to decode the data of the cursor into a map[string]interface{}, I tried it directly but it doesn't works at all, so I fount that I have to convert it to a BSON document and next convert it to a map[string]interface{}, and finally into a JSON string. I tried the following code:

...
for cursor.Next(context.Background()) {
    err = cursor.Decode(&itemBson)
    ...
    b, err := bson.Marshal(itemBson)
    ...
    err = bson.Unmarshal(b, &itemMap)
    ...
}
...

But the bson document has the following value:

map[_id:ObjectID("5c2d0809a49bad7d547ec028") applications:bson.Array[bson.Document{bson.Element{"enabled": true}}] userName:coto userUUID:df2d ea92-c189-53b3-aafe-485d0be23bee]

And the map parsed as JSON:

{"_id":"5c2d0809a49bad7d547ec028","applications":[{}],"userName":"coto","userUUID":"df2dea92-c189-53b3-aafe-485d0be23bee"}

As you can see the key "applications" is empty in the JSON, but it really has content in the BSON document. I don't know why the data disappear.

How I can solve this error? Thanks.

Answer 1

Solved:

I solved this error using the following code:

var jsonDocuments []map[string]interface{}
var byteDocuments []byte

var bsonDocument bson.D
var jsonDocument map[string]interface{}
var temporaryBytes []byte

for cursor.Next(context.Background()) {
    err = cursor.Decode(&bsonDocument)

    if err != nil {
        report.Report{Error: err, Trace: report.Trace()}.Send()
        requestContext.StatusCode(500)
        return `500 Internal server error`
    }

    temporaryBytes, err = bson.MarshalExtJSON(bsonDocument, true, true)

    if err != nil {
        report.Report{Error: err, Trace: report.Trace()}.Send()
        requestContext.StatusCode(500)
        return `500 Internal server error`
    }

    err = json.Unmarshal(temporaryBytes, &jsonDocument)

    if err != nil {
        report.Report{Error: err, Trace: report.Trace()}.Send()
        requestContext.StatusCode(500)
        return `500 Internal server error`
    }

    jsonDocuments = append(jsonDocuments, jsonDocument)
}