Trait avocado::ops::Distinct

pub trait Distinct<T: Doc>: Debug {
    type Output: for<'a> Deserialize<'a>;

    const FIELD: &'static str;
    fn filter(&self) -> Document { ... }
    fn transform(raw: Bson) -> Result<Bson> { ... }
    fn options() -> DistinctOptions { ... }
}

A query for returning the distinct values of a field.

Associated Types

type Output: for<'a> Deserialize<'a>

The type of the field of which the distinct values will be returned.

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Associated Constants

const FIELD: &'static str

The name of the field of which the distinct values will be returned.

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Provided methods

fn filter(&self) -> Document

Optional filter restricting which values are taken into account. Defaults to no filtering.

fn transform(raw: Bson) -> Result<Bson>

Optional transform applied to each returned raw BSON. Can be used to adjust the structure of the loosely-typed data so that it fits what is expected by <Self::Output as Deserialize>::deserialize().

The default implementation just returns its argument verbatim.

fn options() -> DistinctOptions

Options for this query.

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Implementations on Foreign Types

impl<T: Doc, Q: Distinct<T>, '_> Distinct<T> for &'_ Q

type Output = Q::Output

const FIELD: &'static str

fn filter(&self) -> Document

fn transform(bson: Bson) -> Result<Bson>

fn options() -> DistinctOptions

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Implementors

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