Aggregation Expression - $push

Function Build

Build $push with the Push function from the aggregation package.

// bson.D{bson.E{Key:"names", Value:bson.D{bson.E{Key:"$push", Value:"$name"}}}}
result := aggregation.Push("names", "$name")

Method Build (Builder)

Build $push with the Push method from aggregation.NewBuilder().

// bson.D{bson.E{Key:"names", Value:bson.D{bson.E{Key:"$push", Value:"$name"}}}}
result := aggregation.NewBuilder().
    Push("names", "$name").
    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.

PushWithoutKey

Function build:

// bson.D{bson.E{Key:"$push", Value:"$name"}}
expr := aggregation.PushWithoutKey("$name")

Method build (Builder):

// bson.D{bson.E{Key:"$push", Value:"$name"}}
expr := aggregation.NewBuilder().
    PushWithoutKey("$name").
    Build()