Aggregation Expression - $log

Function Build

Build $log with the Log function from the aggregation package.

// bson.D{bson.E{Key:"result", Value:bson.D{bson.E{Key:"$log", Value:[]interface {}{"$value", 10}}}}}
result := aggregation.Log("result", "$value", 10)

Method Build (Builder)

Build $log with the Log method from aggregation.NewBuilder().

// bson.D{bson.E{Key:"result", Value:bson.D{bson.E{Key:"$log", Value:[]interface {}{"$value", 10}}}}}
result := aggregation.NewBuilder().
    Log("result", "$value", 10).
    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.

LogWithoutKey

This variant is currently available as a builder method.

Method build (Builder):

// bson.D{bson.E{Key:"$log", Value:[]any{"$value", 10}}}
expr := aggregation.NewBuilder().
    LogWithoutKey("$value", 10).
    Build()