mongodb aggregate project code example
Example 1: mongodb project all fields
db.collection.aggregate([
{ "$addFields": { "custom_field": "$obj.obj_field1" } }
])
Example 2: MONGODB AGGREGATION tutorials
db.stocks.insertMany([
{ name: "Infosys", qty: 100, price: 800 },
{ name: "TCS", qty: 100, price: 2000 },
{ name: "Wipro", qty: 2500, price: 300 }
])
Example 3: MONGODB AGGREGATION tutorials
db.stocks.find().pretty()