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FindOne

mongodb::action

Struct FindOne 

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pub struct FindOne<'a, T: Send + Sync> { /* private fields */ }
Expand description

Finds a single document in a collection matching a filter. Construct with Collection::find_one.

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impl<'a, T: Send + Sync> FindOne<'a, T>

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pub fn session(self, value: impl Into<&'a mut ClientSession>) -> Self

Use the provided session when running the operation.

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pub fn with_options(self, value: impl Into<Option<FindOneOptions>>) -> Self

Set all options. Note that this will replace all previous values set.

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pub fn allow_partial_results(self, value: bool) -> Self

If true, partial results will be returned from a mongos rather than an error being returned if one or more shards is down.

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pub fn collation(self, value: Collation) -> Self

The collation to use for the operation.

See the documentation for more information on how to use this option.

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pub fn comment(self, value: impl Into<Bson>) -> Self

Tags the query with an arbitrary Bson value to help trace the operation through the database profiler, currentOp and logs.

For server versions less than 4.4, only a string value may be provided.

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pub fn hint(self, value: Hint) -> Self

The index to use for the operation.

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pub fn max(self, value: Document) -> Self

The exclusive upper bound for a specific index.

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pub fn max_scan(self, value: u64) -> Self

Maximum number of documents or index keys to scan when executing the query.

Note: this option is deprecated starting in MongoDB version 4.0 and removed in MongoDB 4.2. Use the maxTimeMS option instead.

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pub fn max_time(self, value: Duration) -> Self

The maximum amount of time to allow the query to run.

This options maps to the maxTimeMS MongoDB query option, so the duration will be sent across the wire as an integer number of milliseconds.

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pub fn min(self, value: Document) -> Self

The inclusive lower bound for a specific index.

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pub fn projection(self, value: Document) -> Self

Limits the fields of the document being returned.

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pub fn read_concern(self, value: ReadConcern) -> Self

The read concern to use for this find query.

If none specified, the default set on the collection will be used.

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pub fn return_key(self, value: bool) -> Self

Whether to return only the index keys in the documents.

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pub fn selection_criteria(self, value: SelectionCriteria) -> Self

The criteria used to select a server for this find query.

If none specified, the default set on the collection will be used.

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pub fn show_record_id(self, value: bool) -> Self

Whether to return the record identifier for each document.

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pub fn skip(self, value: u64) -> Self

The number of documents to skip before counting.

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pub fn sort(self, value: Document) -> Self

The order of the documents for the purposes of the operation.

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pub fn let_vars(self, value: Document) -> Self

Map of parameter names and values. Values must be constant or closed expressions that do not reference document fields. Parameters can then be accessed as variables in an aggregate expression context (e.g. “$$var”).

Only available in MongoDB 5.0+.

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impl<'a, T: DeserializeOwned + Send + Sync> FindOne<'a, T>

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pub fn run(self) -> Result<Option<T>>

Available on crate feature sync only.

Synchronously execute this action.

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impl<'a, T: DeserializeOwned + Send + Sync> Action for FindOne<'a, T>

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fn optional<Value>( self, value: Option<Value>, f: impl FnOnce(Self, Value) -> Self, ) -> Self
where Self: Sized,

If the value is Some, call the provided function on self. Convenient for chained updates with values that need to be set conditionally. For example: Read more
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impl<'a, T: DeserializeOwned + Send + Sync> IntoFuture for FindOne<'a, T>

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type Output = Result<Option<T>, Error>

The output that the future will produce on completion.
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type IntoFuture = FindOneFuture<'a, T>

Which kind of future are we turning this into?
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fn into_future(self) -> Self::IntoFuture

Creates a future from a value. Read more

Auto Trait Implementations§

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impl<'a, T> Freeze for FindOne<'a, T>

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impl<'a, T> !RefUnwindSafe for FindOne<'a, T>

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impl<'a, T> Send for FindOne<'a, T>

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impl<'a, T> Sync for FindOne<'a, T>

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impl<'a, T> Unpin for FindOne<'a, T>

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impl<'a, T> !UnwindSafe for FindOne<'a, T>

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