MongoDb : How to insert additional object into object collection in golang?

Question

I want just push object into array of objects in mongodb

 {
    "_id" : ObjectId("51c9cf2b206dfb73d666ae07"),
    "firstName" : "john",
    "lastName" : "smith",
    "ownerEmail" : "[email protected]",
    "camps" : [
            {
                    "name" : "cubs-killeen",
                    "location" : "killeen"
            },
            {
                    "name" : "cubs-temple",
                    "location" : "temple"
            }
    ],
    "instructors" : [
            {
                    "firstName" : "joe",
                    "lastName" : "black"
            },
            {
                    "firstName" : "will",
                    "lastName" : "smith"
            }
    ]
}

and to push object into above document in need to do

db.stack.update({"ownerEmail":"[email protected]"}, 
             {$push: { 
                        "camps":{ "name":"cubs-killeen","location":"some other Place" } 
                      }
             }
             )

So how can i implement same functionality using mgo driver

There is no need to prefix question titles with their tags, please edit the title. Also, please do not abuse bold markup. — Dave C
– Dave C, Commented Apr 23, 2015 at 17:09

fonini · Accepted Answer · 2016-09-13 18:21:30Z

2

Try the following:

session, err := mgo.Dial("127.0.0.1")
if err != nil {
    panic(err)
}

defer session.Close()

session.SetMode(mgo.Monotonic, true)

// Drop Database
if IsDrop {
    err = session.DB("test").DropDatabase()
    if err != nil {
        panic(err)
    }
}

// Collection Stack
c := session.DB("test").C("stack")

// Query
query := bson.M{"ownerEmail": "[email protected]"}
update := bson.M{"$push": bson.M{"camps": bson.M{"name": "cubs-killeen", "location": "some other Place"}}}

// Update
err = c.Update(query, update)
if err != nil {
    panic(err)
}

edited Sep 13, 2016 at 18:21

fonini

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answered Apr 23, 2015 at 8:43

chridam

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5 Comments

Akash Shinde Over a year ago

thanx for clarified ans

chridam Over a year ago

@AkashShinde No worries :-)

Akash Shinde Over a year ago

above method is adding element as array

chridam Over a year ago

@AkashShinde I thought in your question that's the update you wanted. The $push operator appends a specified value to an array. Consider using the $addToSet operator, it adds a value to an array unless the value is already present, in which case $addToSet does nothing to that array.

Akash Shinde Over a year ago

sorry your code working fine, i did mistake , i was appending array to array

Jyotsna Gupta · Accepted Answer · 2019-05-12 00:46:18Z

2

I assume your codebase has Camps struct similar to:

type Camps struct {
    Name     string   `json:"name,omitempty"`
    Location string   `json:"location,omitempty"`
 }

Golang code:

database := "yourDatabaseName"  
collection := "stack"

session, err := mgo.Dial("127.0.0.1")
if err != nil {
    panic(err)
 }
defer session.Close()

session.SetMode(mgo.Monotonic, true)
c := session.DB(database).C(collection)

data := model.Camps{
        Name:       "cubs-killeen",
        Location:   "some other Place",
   }
selector := bson.M{"ownerEmail": "[email protected]"}
changes := bson.M{"$push": bson.M{"camps": bson.M{"$each": []model.Camps{data}}}}
err = c.Update(selector, changes)

if err != nil {
    panic(err)
 }

edited May 12, 2019 at 0:46

answered May 12, 2019 at 0:39

Jyotsna Gupta

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