Enum mongodb::options::SelectionCriteria

#[non_exhaustive]
pub enum SelectionCriteria {
    ReadPreference(ReadPreference),
    Predicate(Predicate),
}

Describes which servers are suitable for a given operation.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ReadPreference(ReadPreference)

A read preference that describes the suitable servers based on the server type, max staleness, and server tags.

See the documentation here for more details.

Tuple Fields of ReadPreference

0: ReadPreference

Predicate(Predicate)

A predicate used to filter servers that are considered suitable. A server will be considered suitable by a predicate if predicate(server) returns true.

Tuple Fields of Predicate

0: Predicate

Trait Implementations

impl Clone for SelectionCriteria

fn clone(&self) -> SelectionCriteria

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for SelectionCriteria

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SelectionCriteria

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where
    D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl From<ReadPreference> for SelectionCriteria

fn from(read_pref: ReadPreference) -> Self

Performs the conversion.

impl PartialEq<SelectionCriteria> for SelectionCriteria

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.