How to get the value from the map - go lang?
I am working with mgo
to use MongoDB with Go. I have the following code:
func Find(collectionName, dbName string, query interface{}) (result []interface{}, err error) {
collection := session.DB(dbName).C(collectionName)
err = collection.Find(query).All(&result)
return result, err
}
func GetTransactionID() (id interface{}, err error) {
query := bson.M{}
transId, err := Find("transactionId", dbName, query)
for key, value := range transId {
fmt.Println("k:", key, "v:", value)
}
}
Output:
k: 0 v: map [_id: ObjectIdHex ("536887c199b6d0510964c35b") transId: A000000000]
I need to get the values to _id
and transId
from the map value returned in the slice from Find
. How can i do this?
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I'm just guessing, but in case you just want to get all the Transaction documents and print them - here's how:
Given what you have struct
, representing your collection's document structure, for example:
type Transaction struct {
Id bson.ObjectId `bson:"_id"`
TransactionId string `bson:"transId"`
}
You can get all documents using MongoDB driver (mgo):
var transactions []Transaction
err = c.Find(bson.M{}).All(&transactions)
// handle err
for index, transaction := range transactions {
fmt.Printf("%d: %+v\n", index, transaction)
}
Supplement (general solution)
OK, after you've provided more details, this might be a generic solution without using a framework. Try marshalling in BSON doc bson.M
(not tested):
var data []bson.M
err := c.Find(bson.M{}).All(&data)
// handle err
for _, doc := range data {
for key, value := range doc {
fmt.Println(key, value)
}
}
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