How to marshal json string to bson document for writing to MongoDB?

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问题内容

What I am looking is equivalent of [Document.parse()](https://api.mongodb.com/java/3.2/org/bson/Document.html#parse- java.lang.String-)

in golang, that allows me create bson from json directly? I do not want to create intermediate Go structs for marshaling

正确答案

The gopkg.in/mgo.v2/bson package has a function called UnmarshalJSON which does exactly what you want.

The data parameter should hold you JSON string as []byte value.

 func UnmarshalJSON(data []byte, value interface{}) error

UnmarshalJSON unmarshals a JSON value that may hold non-standard syntax as defined in BSON's extended JSON specification.

Example:

var bdoc interface{}
err = bson.UnmarshalJSON([]byte(`{"id": 1,"name": "A green door","price": 12.50,"tags": ["home", "green"]}`),&bdoc)
if err != nil {
    panic(err)
}
err = c.Insert(&bdoc)

if err != nil {
    panic(err)
}

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