Struct Lookup 

pub struct Lookup {
    pub from: String,
    pub local_field: Option<String>,
    pub foreign_field: Option<String>,
    pub as_field: String,
    pub pipeline: Option<Vec<Value>>,
    pub let_vars: Option<Map<String, Value>>,
}

A $lookup stage for MongoDB aggregation pipelines.

Fields

from: String

The foreign collection.

local_field: Option<String>

Local field to match.

foreign_field: Option<String>

Foreign field to match.

as_field: String

Output array field name.

pipeline: Option<Vec<Value>>

Pipeline to run on matched documents.

let_vars: Option<Map<String, Value>>

Variables to pass to pipeline.

Implementations

impl Lookup

pub fn simple( from: impl Into<String>, local: impl Into<String>, foreign: impl Into<String>, as_field: impl Into<String>, ) -> Self

Create a simple $lookup (equality match).

pub fn with_pipeline( from: impl Into<String>, as_field: impl Into<String>, ) -> LookupBuilder

Create a $lookup with pipeline (subquery).

pub fn to_bson(&self) -> JsonValue

Convert to BSON document.

Trait Implementations

impl Clone for Lookup

fn clone(&self) -> Lookup

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Lookup

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Lookup

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Lookup

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Lookup

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 Lookup