Aggregation Expression - $cond

Function Build

Build $cond with the Cond function from the aggregation package.

// bson.D{bson.E{Key:"level", Value:bson.D{bson.E{Key:"$cond", Value:[]interface {}{aggregation.GteWithoutKey("$score", 60), "pass", "fail"}}}}}
result := aggregation.Cond("level", aggregation.GteWithoutKey("$score", 60), "pass", "fail")

Method Build (Builder)

Build $cond with the Cond method from aggregation.NewBuilder().

// bson.D{bson.E{Key:"level", Value:bson.D{bson.E{Key:"$cond", Value:[]interface {}{aggregation.GteWithoutKey("$score", 60), "pass", "fail"}}}}}
result := aggregation.NewBuilder().
    Cond("level", aggregation.GteWithoutKey("$score", 60), "pass", "fail").
    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.

CondWithoutKey

Function build:

// bson.D{bson.E{Key:"$cond", Value:[]any{aggregation.GteWithoutKey("$score", 60), "pass", "fail"}}}
expr := aggregation.CondWithoutKey(aggregation.GteWithoutKey("$score", 60), "pass", "fail")

Method build (Builder):

// bson.D{bson.E{Key:"$cond", Value:[]any{aggregation.GteWithoutKey("$score", 60), "pass", "fail"}}}
expr := aggregation.NewBuilder().
    CondWithoutKey(aggregation.GteWithoutKey("$score", 60), "pass", "fail").
    Build()