MongoCollection Structure Reference


                    
                    
                    encoder

Encoder used by this collection for BSON conversions. (e.g. converting CollectionTypes, indexes, and options to documents).

Declaration

Swift

public var encoder: BSONEncoder { get }

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                    decoder

Decoder used by this collection for BSON conversions (e.g. converting documents to CollectionTypes).

Declaration

Swift

public var decoder: BSONDecoder { get }

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                    CollectionType

A Codable type associated with this MongoCollection instance. This allows CollectionType values to be directly inserted into and retrieved from the collection, by encoding/decoding them using the BSONEncoder and BSONDecoder. The strategies to be used by the encoder and decoder for certain types can be configured by setting the coding strategies on the options used to create this collection instance. The default strategies are inherited from those set on the database this collection derived from.

This type association only exists in the context of this particular MongoCollection instance. It is the responsibility of the user to ensure that any data already stored in the collection was encoded from this same type and according to the coding strategies set on this instance.

Declaration

Swift

public typealias CollectionType = T

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                    namespace

The namespace for this collection.

Declaration

Swift

public var namespace: MongoNamespace { get }

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                    name

The name of this collection.

Declaration

Swift

public var name: String { get }

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                    readConcern

The ReadConcern set on this collection, or nil if one is not set.

Declaration

Swift

public var readConcern: ReadConcern? { get }

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                    readPreference

The ReadPreference set on this collection.

Declaration

Swift

public var readPreference: ReadPreference { get }

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                    writeConcern

The WriteConcern set on this collection, or nil if one is not set.

Declaration

Swift

public var writeConcern: WriteConcern? { get }

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                    drop(options:session:)

Drops this collection from its parent database.

Throws

Throws:

MongoError.CommandError if an error occurs that prevents the command from executing.

Declaration

Swift

public func drop(options: DropCollectionOptions? = nil, session: ClientSession? = nil) throws

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                    watch(_:options:session:)

Starts a ChangeStream on a collection. The CollectionType will be associated with the fullDocument field in ChangeStreamEvents emitted by the returned ChangeStream. The server will return an error if this method is called on a system collection.

Throws

Throws:

MongoError.CommandError if an error occurs on the server while creating the change stream.
MongoError.InvalidArgumentError if the options passed formed an invalid combination.
MongoError.InvalidArgumentError if the _id field is projected out of the change stream documents by the pipeline.

Declaration

Swift

public func watch(
    _ pipeline: [BSONDocument] = [],
    options: ChangeStreamOptions? = nil,
    session: ClientSession? = nil
) throws -> ChangeStream<ChangeStreamEvent<CollectionType>>

Parameters

`pipeline`	An array of aggregation pipeline stages to apply to the events returned by the change stream.
`options`	An optional `ChangeStreamOptions` to use when constructing the change stream.
`session`	An optional `ClientSession` to use with this change stream.

Return Value

A ChangeStream on a specific collection.

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                    watch(_:options:session:withFullDocumentType:)

Starts a ChangeStream on a collection. Associates the specified Codable type T with the fullDocument field in the ChangeStreamEvents emitted by the returned ChangeStream. The server will return an error if this method is called on a system collection.

Throws

Throws:

MongoError.CommandError if an error occurs on the server while creating the change stream.
MongoError.InvalidArgumentError if the options passed formed an invalid combination.
MongoError.InvalidArgumentError if the _id field is projected out of the change stream documents by the pipeline.

Declaration

Swift

public func watch<FullDocType: Codable>(
    _ pipeline: [BSONDocument] = [],
    options: ChangeStreamOptions? = nil,
    session: ClientSession? = nil,
    withFullDocumentType _: FullDocType.Type
) throws -> ChangeStream<ChangeStreamEvent<FullDocType>>

Parameters

`pipeline`	An array of aggregation pipeline stages to apply to the events returned by the change stream.
`options`	An optional `ChangeStreamOptions` to use when constructing the change stream.
`session`	An optional `ClientSession` to use with this change stream.
`withFullDocumentType`	The type that the `fullDocument` field of the emitted `ChangeStreamEvent`s will be decoded to.

Return Value

A ChangeStream on a specific collection.

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                    watch(_:options:session:withEventType:)

Starts a ChangeStream on a collection. Associates the specified Codable type T with the returned ChangeStream. The server will return an error if this method is called on a system collection.

Throws

Throws:

MongoError.CommandError if an error occurs on the server while creating the change stream.
MongoError.InvalidArgumentError if the options passed formed an invalid combination.
MongoError.InvalidArgumentError if the _id field is projected out of the change stream documents by the pipeline.

Declaration

Swift

public func watch<EventType: Codable>(
    _ pipeline: [BSONDocument] = [],
    options: ChangeStreamOptions? = nil,
    session: ClientSession? = nil,
    withEventType _: EventType.Type
) throws -> ChangeStream<EventType>

Parameters

`pipeline`	An array of aggregation pipeline stages to apply to the events returned by the change stream.
`options`	An optional `ChangeStreamOptions` to use when constructing the change stream.
`session`	An optional `ClientSession` to use with this change stream.
`withEventType`	The type that the entire change stream response will be decoded to and that will be returned when iterating through the change stream.

Return Value

A ChangeStream on a specific collection.

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                    findOneAndDelete(_:options:session:)

Finds a single document and deletes it, returning the original.

Throws

Throws:

MongoError.InvalidArgumentError if any of the provided options are invalid.
MongoError.LogicError if the provided session is inactive.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.WriteError if an error occurs while executing the command.
DecodingError if the deleted document cannot be decoded to a CollectionType value.

Declaration

Swift

@discardableResult
public func findOneAndDelete(
    _ filter: BSONDocument,
    options: FindOneAndDeleteOptions? = nil,
    session: ClientSession? = nil
) throws -> CollectionType?

Parameters

`filter`	`Document` representing the match criteria
`options`	Optional `FindOneAndDeleteOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The deleted document, represented as a CollectionType, or nil if no document was deleted.

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                    findOneAndReplace(filter:replacement:options:session:)

Finds a single document and replaces it, returning either the original or the replaced document.

Throws

Throws:

MongoError.InvalidArgumentError if any of the provided options are invalid.
MongoError.LogicError if the provided session is inactive.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.WriteError if an error occurs while executing the command.
DecodingError if the replaced document cannot be decoded to a CollectionType value.
EncodingError if replacement cannot be encoded to a Document.

Declaration

Swift

@discardableResult
public func findOneAndReplace(
    filter: BSONDocument,
    replacement: CollectionType,
    options: FindOneAndReplaceOptions? = nil,
    session: ClientSession? = nil
) throws -> CollectionType?

Parameters

`filter`	`Document` representing the match criteria
`replacement`	a `CollectionType` to replace the found document
`options`	Optional `FindOneAndReplaceOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

A CollectionType, representing either the original document or its replacement, depending on selected options, or nil if there was no match.

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                    findOneAndUpdate(filter:update:options:session:)

Finds a single document and updates it, returning either the original or the updated document.

Throws

Throws:

MongoError.InvalidArgumentError if any of the provided options are invalid.
MongoError.LogicError if the provided session is inactive.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.WriteError if an error occurs while executing the command.
DecodingError if the updated document cannot be decoded to a CollectionType value.

Declaration

Swift

@discardableResult
public func findOneAndUpdate(
    filter: BSONDocument,
    update: BSONDocument,
    options: FindOneAndUpdateOptions? = nil,
    session: ClientSession? = nil
) throws -> CollectionType?

Parameters

`filter`	`Document` representing the match criteria
`update`	a `Document` containing updates to apply
`options`	Optional `FindOneAndUpdateOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

A CollectionType representing either the original or updated document, depending on selected options, or nil if there was no match.

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                    createIndex(_:indexOptions:options:session:)

Creates an index over the collection for the provided keys with the provided options.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the write.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the index specification or options.

Declaration

Swift

@discardableResult
public func createIndex(
    _ keys: BSONDocument,
    indexOptions: IndexOptions? = nil,
    options: CreateIndexOptions? = nil,
    session: ClientSession? = nil
) throws -> String

Parameters

`keys`	a `Document` specifing the keys for the index
`indexOptions`	Optional `IndexOptions` to use for the index
`options`	Optional `CreateIndexOptions` to use for the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The name of the created index.

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                    createIndex(_:options:session:)

Creates an index over the collection for the provided keys with the provided options.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the write.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the index specification or options.

Declaration

Swift

@discardableResult
public func createIndex(
    _ model: IndexModel,
    options: CreateIndexOptions? = nil,
    session: ClientSession? = nil
) throws -> String

Parameters

`model`	An `IndexModel` representing the keys and options for the index
`options`	Optional `CreateIndexOptions` to use for the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The name of the created index.

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                    createIndexes(_:options:session:)

Creates multiple indexes in the collection.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the write.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the index specifications or options.

Declaration

Swift

@discardableResult
public func createIndexes(
    _ models: [IndexModel],
    options: CreateIndexOptions? = nil,
    session: ClientSession? = nil
) throws -> [String]

Parameters

`models`	An `[IndexModel]` specifying the indexes to create
`options`	Optional `CreateIndexOptions` to use for the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

An [String] containing the names of all the indexes that were created.

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                    dropIndex(_:options:session:)

Drops a single index from the collection by the index name.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
EncodingError if an error occurs while encoding the options.

Declaration

Swift

public func dropIndex(
    _ name: String,
    options: DropIndexOptions? = nil,
    session: ClientSession? = nil
) throws

Parameters

`name`	The name of the index to drop
`options`	Optional `DropIndexOptions` to use for the command
`session`	Optional `ClientSession` to use when executing this command

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                    dropIndex(_:options:session:)

Attempts to drop a single index from the collection given the keys describing it.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options.

Declaration

Swift

public func dropIndex(
    _ keys: BSONDocument,
    options: DropIndexOptions? = nil,
    session: ClientSession? = nil
) throws

Parameters

`keys`	a `Document` containing the keys for the index to drop
`options`	Optional `DropIndexOptions` to use for the command
`session`	Optional `ClientSession` to use when executing this command

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                    dropIndex(_:options:session:)

Attempts to drop a single index from the collection given an IndexModel describing it.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options.

Declaration

Swift

public func dropIndex(
    _ model: IndexModel,
    options: DropIndexOptions? = nil,
    session: ClientSession? = nil
) throws

Parameters

`model`	An `IndexModel` describing the index to drop
`options`	Optional `DropIndexOptions` to use for the command
`session`	Optional `ClientSession` to use when executing this command

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                    dropIndexes(options:session:)

Drops all indexes in the collection.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options.

Declaration

Swift

public func dropIndexes(
    options: DropIndexOptions? = nil,
    session: ClientSession? = nil
) throws

Parameters

`options`	Optional `DropIndexOptions` to use for the command
`session`	Optional `ClientSession` to use when executing this command

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                    listIndexes(session:)

Retrieves a list of the indexes currently on this collection.

Throws

MongoError.LogicError if the provided session is inactive.

Declaration

Swift

public func listIndexes(session: ClientSession? = nil) throws -> MongoCursor<IndexModel>

Parameters


                                session

Optional ClientSession to use when executing this command

Return Value

A MongoCursor over the IndexModels.

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                    listIndexNames(session:)

Retrieves a list of names of the indexes currently on this collection.

Throws

MongoError.LogicError if the provided session is inactive.

Declaration

Swift

public func listIndexNames(session: ClientSession? = nil) throws -> [String]

Parameters


                                session

Optional ClientSession to use when executing this command

Return Value

A MongoCursor over the index names.

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                    find(_:options:session:)

Finds the documents in this collection which match the provided filter.

Throws

Throws:

MongoError.InvalidArgumentError if the options passed are an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options to BSON.

Declaration

Swift

public func find(
    _ filter: BSONDocument = [:],
    options: FindOptions? = nil,
    session: ClientSession? = nil
) throws -> MongoCursor<CollectionType>

Parameters

`filter`	A `Document` that should match the query
`options`	Optional `FindOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

A MongoCursor over the resulting Documents

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                    findOne(_:options:session:)

Finds a single document in this collection that matches the provided filter.

Throws

Throws:

MongoError.InvalidArgumentError if the options passed are an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options to BSON.

Declaration

Swift

public func findOne(
    _ filter: BSONDocument = [:],
    options: FindOneOptions? = nil,
    session: ClientSession? = nil
) throws -> T?

Parameters

`filter`	A `Document` that should match the query
`options`	Optional `FindOneOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

the resulting Document, or nil if there is no match

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                    aggregate(_:options:session:)

Runs an aggregation framework pipeline against this collection.

Throws

Throws:

MongoError.InvalidArgumentError if the options passed are an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options to BSON.

Declaration

Swift

public func aggregate(
    _ pipeline: [BSONDocument],
    options: AggregateOptions? = nil,
    session: ClientSession? = nil
) throws -> MongoCursor<BSONDocument>

Parameters

`pipeline`	an `[Document]` containing the pipeline of aggregation operations to perform
`options`	Optional `AggregateOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

A MongoCursor over the resulting Documents

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                    countDocuments(_:options:session:)

Counts the number of documents in this collection matching the provided filter. Note that an empty filter will force a scan of the entire collection. For a fast count of the total documents in a collection see estimatedDocumentCount.

Declaration

Swift

public func countDocuments(
    _ filter: BSONDocument = [:],
    options: CountDocumentsOptions? = nil,
    session: ClientSession? = nil
) throws -> Int

Parameters

`filter`	a `Document`, the filter that documents must match in order to be counted
`options`	Optional `CountDocumentsOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The count of the documents that matched the filter

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                    estimatedDocumentCount(options:)

Gets an estimate of the count of documents in this collection using collection metadata. This operation cannot be used in a transaction.

Declaration

Swift

public func estimatedDocumentCount(options: EstimatedDocumentCountOptions? = nil) throws -> Int

Parameters


                                options

Optional EstimatedDocumentCountOptions to use when executing the command

Return Value

an estimate of the count of documents in this collection

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                    distinct(fieldName:filter:options:session:)

Finds the distinct values for a specified field across the collection.

Throws

Throws:

MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options to BSON.

Declaration

Swift

public func distinct(
    fieldName: String,
    filter: BSONDocument = [:],
    options: DistinctOptions? = nil,
    session: ClientSession? = nil
) throws -> [BSON]

Parameters

`fieldName`	The field for which the distinct values will be found
`filter`	a `Document` representing the filter documents must match in order to be considered for the operation
`options`	Optional `DistinctOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

A [BSONValue] containing the distinct values for the specified criteria

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                    insertOne(_:options:session:)

Encodes the provided value to BSON and inserts it. If the value is missing an identifier, one will be generated for it.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the CollectionType to BSON.

Declaration

Swift

@discardableResult
public func insertOne(
    _ value: CollectionType,
    options: InsertOneOptions? = nil,
    session: ClientSession? = nil
) throws -> InsertOneResult?

Parameters

`value`	A `CollectionType` value to encode and insert
`options`	Optional `InsertOneOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The optional result of attempting to perform the insert. If the WriteConcern is unacknowledged, nil is returned.

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                    insertMany(_:options:session:)

Encodes the provided values to BSON and inserts them. If any values are missing identifiers, the driver will generate them.

Throws

Throws:

MongoError.BulkWriteError if an error occurs while performing any of the writes.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the CollectionType or options to BSON.

Declaration

Swift

@discardableResult
public func insertMany(
    _ values: [CollectionType],
    options: InsertManyOptions? = nil,
    session: ClientSession? = nil
) throws -> InsertManyResult?

Parameters

`values`	The `CollectionType` values to insert
`options`	optional `InsertManyOptions` to use while executing the operation
`session`	Optional `ClientSession` to use when executing this command

Return Value

an InsertManyResult, or nil if the write concern is unacknowledged.

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                    replaceOne(filter:replacement:options:session:)

Replaces a single document matching the provided filter in this collection.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the CollectionType or options to BSON.

Declaration

Swift

@discardableResult
public func replaceOne(
    filter: BSONDocument,
    replacement: CollectionType,
    options: ReplaceOptions? = nil,
    session: ClientSession? = nil
) throws -> UpdateResult?

Parameters

`filter`	A `Document` representing the match criteria
`replacement`	The replacement value, a `CollectionType` value to be encoded and inserted
`options`	Optional `ReplaceOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The optional result of attempting to replace a document. If the WriteConcern is unacknowledged, nil is returned.

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                    updateOne(filter:update:options:session:)

Updates a single document matching the provided filter in this collection.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options to BSON.

Declaration

Swift

@discardableResult
public func updateOne(
    filter: BSONDocument,
    update: BSONDocument,
    options: UpdateOptions? = nil,
    session: ClientSession? = nil
) throws -> UpdateResult?

Parameters

`filter`	A `Document` representing the match criteria
`update`	A `Document` representing the update to be applied to a matching document
`options`	Optional `UpdateOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The optional result of attempting to update a document. If the WriteConcern is unacknowledged, nil is returned.

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                    updateMany(filter:update:options:session:)

Updates multiple documents matching the provided filter in this collection.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options to BSON.

Declaration

Swift

@discardableResult
public func updateMany(
    filter: BSONDocument,
    update: BSONDocument,
    options: UpdateOptions? = nil,
    session: ClientSession? = nil
) throws -> UpdateResult?

Parameters

`filter`	A `Document` representing the match criteria
`update`	A `Document` representing the update to be applied to matching documents
`options`	Optional `UpdateOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The optional result of attempting to update multiple documents. If the write concern is unacknowledged, nil is returned

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                    deleteOne(_:options:session:)

Deletes a single matching document from the collection.

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options to BSON.

Declaration

Swift

@discardableResult
public func deleteOne(
    _ filter: BSONDocument,
    options: DeleteOptions? = nil,
    session: ClientSession? = nil
) throws -> DeleteResult?

Parameters

`filter`	A `Document` representing the match criteria
`options`	Optional `DeleteOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The optional result of performing the deletion. If the WriteConcern is unacknowledged, nil is returned.

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                    deleteMany(_:options:session:)

Deletes multiple documents

Throws

Throws:

MongoError.WriteError if an error occurs while performing the command.
MongoError.CommandError if an error occurs that prevents the command from executing.
MongoError.InvalidArgumentError if the options passed in form an invalid combination.
MongoError.LogicError if the provided session is inactive.
EncodingError if an error occurs while encoding the options to BSON.

Declaration

Swift

@discardableResult
public func deleteMany(
    _ filter: BSONDocument,
    options: DeleteOptions? = nil,
    session: ClientSession? = nil
) throws -> DeleteResult?

Parameters

`filter`	Document representing the match criteria
`options`	Optional `DeleteOptions` to use when executing the command
`session`	Optional `ClientSession` to use when executing this command

Return Value

The optional result of performing the deletion. If the WriteConcern is unacknowledged, nil is returned.

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                    bulkWrite(_:options:session:)

Execute multiple write operations.

Throws

Throws:

MongoError.InvalidArgumentError if requests is empty.
MongoError.LogicError if the provided session is inactive.
MongoError.BulkWriteError if any error occurs while performing the writes. This includes errors that would typically be thrown as RuntimeErrors or MongoError.CommandErrors elsewhere.
EncodingError if an error occurs while encoding the CollectionType or the options to BSON.

Declaration

Swift

@discardableResult
public func bulkWrite(
    _ requests: [WriteModel<T>],
    options: BulkWriteOptions? = nil,
    session: ClientSession? = nil
) throws -> BulkWriteResult?

Parameters

`requests`	a `[WriteModel]` containing the writes to perform.
`options`	optional `BulkWriteOptions` to use while executing the operation.
`session`	Optional `ClientSession` to use when executing this command

Return Value

a BulkWriteResult, or nil if the write concern is unacknowledged.

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