sreeprasad / simple-mongodb-aggregation

Simple Mongo db aggregation

Simple SP Mongodb aggregation pipeline

How to run

Start the docker to set up Mongodb

docker-compose up -- build

Run the main code

go run main.go

Mongo DB aggregation pipeline

Stores the bitcoind prices in USD into MongodDB from coinbase api from 2023-01-01 to 2024-04-01 and caculates the average price.

To avoid overwhelming coinbase api, I am sleeping for 3 seconds after each API fetch. But you can change it if you want.

Aggregation pipeline

group groups all the documents by id expression. Here id is nil so all documents are grouped together without any distinction as single group. avg calculates the average of the amount for each group and here there is only single group because id is nil.

	pipeline := mongo.Pipeline{
		{{"$group", bson.D{{"_id", nil}, {"averagePrice", bson.D{{"$avg", "$amount"}}}}}},
	}

Screenshots