使用mgo.v2将新对象插入mongodb中文档的Array Attribute中

Question

I am using mgo.v2 mongodb driver to manupulation data with mongodb.I have data strucure as follow json

  "configs": [
        {
          "configid":1,
          "id": 0,
          "widgets": [
            {
              "position": 1,
              "type": 1,
              "class": "normal green",
              "metricid": 5
            },
            {
              "position": 2,
              "type": 1,
              "class": "normal blue",
              "metricid": 6
            }
         ]
      }
    ]

I have created configs collection by using above json structure.

err2 := session.DB("db").C("configs").Insert(&config)

but.In my case, I want add new item to widgets array to this configid. it is kind of object like this,

    {
      "position": 3,
      "type": 1,
      "class": "normal red",
      "metricid": 7
    }

What is the best way to adding this object into widgets array in paticular configid in mongodb? I am using mgo.v2 mongodb driver

Answer 1

You can use the update method to add the array element using the $push operator. For example:

session.DB("db").C("configs").Update(
    bson.M{"configid": 1}, 
    bson.M{"$push": bson.M{"widgets": widget}}
)