Aggregation Expression - $multiply

Function Build

Build $multiply with the Multiply function from the aggregation package.

// bson.D{bson.E{Key:"amount", Value:bson.D{bson.E{Key:"$multiply", Value:[]interface {}{"$price", "$quantity"}}}}}
result := aggregation.Multiply("amount", "$price", "$quantity")

Method Build (Builder)

Build $multiply with the Multiply method from aggregation.NewBuilder().

// bson.D{bson.E{Key:"amount", Value:bson.D{bson.E{Key:"$multiply", Value:[]interface {}{"$price", "$quantity"}}}}}
result := aggregation.NewBuilder().
    Multiply("amount", "$price", "$quantity").
    Build()

Build Without Key

When an expression needs to be passed as an argument to another expression, use a WithoutKey variant to build an expression fragment without an output field name.

MultiplyWithoutKey

Function build:

// bson.D{bson.E{Key:"$multiply", Value:[]any{"$price", "$quantity"}}}
expr := aggregation.MultiplyWithoutKey("$price", "$quantity")

Method build (Builder):

// bson.D{bson.E{Key:"$multiply", Value:[]any{"$price", "$quantity"}}}
expr := aggregation.NewBuilder().
    MultiplyWithoutKey("$price", "$quantity").
    Build()