Struct GroupKey 

pub struct GroupKey(/* private fields */);

How AggregateStage::group derives a group key.

Implementations

impl GroupKey

pub fn field(path: &str) -> Self

Group by the value at a dot path. A document that lacks the path groups under null rather than being dropped.

pub fn constant(value: impl Into<Value>) -> Self

Put the whole collection in one group under this constant — how a collection-wide total is expressed.

Trait Implementations

impl Clone for GroupKey

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GroupKey

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for GroupKey

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for GroupKey

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for GroupKey