使用mongo-go-driver将结果转换为不带结构的JSON [英] convert result into JSON without structs using mongo-go-driver

问题描述

在将结果转换为JSON之前，我不想使用结构.假设我有一些结果:

I don't want to use structs before converting results into JSON. Let's say I have some results:

result, err := collection.Find(ctx, filter, options)

我可以在 docs 变量中收集所有结果，而在 doc 变量中收集最后的结果:

I can collect all results in docs variable and last result in doc variable:

    var doc bson.Raw
    var docs []bson.Raw    
    for result.Next(ctx) {
            document, err := result.DecodeBytes()
            if err != nil {
                log.Println(err)
            }
            doc = document
            docs = append(docs, doc)
        }

我可以轻松地将最后的结果转换为JSON，而无需使用任何结构:

I can easily convert last result into JSON without using any structs:

var jsonDoc bson.M
err = bson.Unmarshal(doc, &jsonDoc)
return jsonDoc

我无法将文档转换为JSON并不能在我的Rest服务器中使用.

I can't convert docs into JSON and use as a result in my Rest server.

更新2019-01-17:

我在REST服务器中使用结果是这样的:

I'm using result in my REST server like this:

user.GET("/booking/customer/:id", func(c *gin.Context) {
    result := GetAllCustomerBookings(c.Param("id"))
    c.JSON(http.StatusOK, result)
})

，所以它不能循环遍历值. 问题:如何将[] bson.Raw转换为[] byte或bson.Raw. 想象一下，现在我在数组的每个值中都有{JSON}.我需要这样的JSON:[{JSON}，{JSON}，...].

so it can't be a loop through values. The question: how to convert []bson.Raw to []byte or bson.Raw. Let's imagine that now I have {JSON} in each value of array. I need one JSON like this: [{JSON}, {JSON}, ...].

使用nodejs更容易，因为我可以在一个JSON文档中发送所有记录. Go和mongodb-go-driver需要遍历所有记录，而我不知道如何构建一个JSON文档.

Using nodejs was easier because I could send all records in one JSON document. Go and mongodb-go-driver needs to go through all records and I don't know how to build one JSON document.

Nodejs和mongodb等效项:

router.get('/bookings/customer/:id', function (req, res, next) {
    db.Bookings.find({
        "booking.customer._id": {
            $eq: req.params.id
        }
    }).sort({
            "booking.arrival_date": -1
        },
        function (err, bookings) {
            if (err) {
                res.send(err);
            } else {
                res.json(bookings);
            }
        });
});

推荐答案

此代码有效.经过数小时的尝试，并祝您好运，我设法解决了这个问题.也许有人会解释这个?

This code works. After few hours of trying and thanks to good luck I managed to solve this issue. Maybe someone will explain this?

我使用 bson.M 和 result.Decode()代替 bson.Raw ，而不是 result.DecodeBytes() 现在，我得到的输出与nodejs给我的输出相同.

Instead of bson.Raw I used bson.M and result.Decode() instead of result.DecodeBytes() Now I have the same output as nodejs gives me.

 var docs []bson.M
    for result.Next(ctx) {
        var document bson.M
        err = result.Decode(&document)
        if err != nil {
            log.Println(err)
        }
        docs = append(docs, document)
    }
    return docs

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