Aggregation Expression - $eq

Function Build

Build $eq with the Eq function from the aggregation package.

// bson.D{bson.E{Key:"sameName", Value:bson.D{bson.E{Key:"$eq", Value:[]interface {}{"$firstName", "$lastName"}}}}}
result := aggregation.Eq("sameName", "$firstName", "$lastName")

Method Build (Builder)

Build $eq with the Eq method from aggregation.NewBuilder().

// bson.D{bson.E{Key:"sameName", Value:bson.D{bson.E{Key:"$eq", Value:[]interface {}{"$firstName", "$lastName"}}}}}
result := aggregation.NewBuilder().
    Eq("sameName", "$firstName", "$lastName").
    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.

EqWithoutKey

Function build:

// bson.D{bson.E{Key:"$eq", Value:[]any{"$status", "active"}}}
expr := aggregation.EqWithoutKey("$status", "active")

Method build (Builder):

// bson.D{bson.E{Key:"$eq", Value:[]any{"$status", "active"}}}
expr := aggregation.NewBuilder().
    EqWithoutKey("$status", "active").
    Build()