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Interface MapReduceOptions<TKey, TValue>

Type Parameters

Hierarchy

Index

Properties

Properties

Optional promoteLongs

promoteLongs?: boolean

when deserializing a Long will fit it into a Number if it's smaller than 53 bits

Optional promoteBuffers

promoteBuffers?: boolean

when deserializing a Binary will return it as a node.js Buffer instance.

Optional promoteValues

promoteValues?: boolean

when deserializing will promote BSON values to their Node.js closest equivalent types.

Optional fieldsAsRaw

fieldsAsRaw?: <internal>.Document

allow to specify if there what fields we wish to return as unserialized raw buffer.

Optional bsonRegExp

bsonRegExp?: boolean

return BSON regular expressions as BSONRegExp instances.

Optional checkKeys

checkKeys?: boolean

the serializer will check if keys are valid.

Optional serializeFunctions

serializeFunctions?: boolean

serialize the javascript functions (default:false).

Optional ignoreUndefined

ignoreUndefined?: boolean

serialize will not emit undefined fields (default:true)

Optional raw

raw?: boolean

Enabling the raw option will return a Node.js Buffer which is allocated using allocUnsafe API. See this section from the Node.js Docs here for more detail about what "unsafe" refers to in this context. If you need to maintain your own editable clone of the bytes returned for an extended life time of the process, it is recommended you allocate your own buffer and clone the contents:

example
const raw = await collection.findOne({}, { raw: true });
const myBuffer = Buffer.alloc(raw.byteLength);
myBuffer.set(raw, 0);
// Only save and use `myBuffer` beyond this point
remarks

Please note there is a known limitation where this option cannot be used at the MongoClient level (see NODE-3946). It does correctly work at Db, Collection, and per operation the same as other BSON options work.

Optional enableUtf8Validation

enableUtf8Validation?: boolean

Enable utf8 validation when deserializing BSON documents. Defaults to true.

Optional fullResponse

fullResponse?: boolean
deprecated

This option does nothing

Optional readConcern

readConcern?: ReadConcernLike

Specify a read concern and level for the collection. (only MongoDB 3.2 or higher supported)

Optional collation

collation?: CollationOptions

Collation

Optional maxTimeMS

maxTimeMS?: number

Optional comment

comment?: unknown

Comment to apply to the operation.

In server versions pre-4.4, 'comment' must be string. A server error will be thrown if any other type is provided.

In server versions 4.4 and above, 'comment' can be any valid BSON type.

Optional retryWrites

retryWrites?: boolean

Should retry failed writes

Optional dbName

dbName?: string

Optional authdb

authdb?: string

Optional noResponse

noResponse?: boolean

Optional explain

explain?: ExplainVerbosityLike

Specifies the verbosity mode for the explain output.

Optional out

out?: "inline" | { inline: 1 } | { replace: string } | { merge: string } | { reduce: string }

Sets the output target for the map reduce job.

Optional query

query?: <internal>.Document

Query filter object.

Optional sort

sort?: <internal>.Sort

Sorts the input objects using this key. Useful for optimization, like sorting by the emit key for fewer reduces.

Optional limit

limit?: number

Number of objects to return from collection.

Optional keeptemp

keeptemp?: boolean

Keep temporary data.

Optional finalize

finalize?: string | FinalizeFunction<TKey, TValue>

Finalize function.

Optional scope

scope?: <internal>.Document

Can pass in variables that can be access from map/reduce/finalize.

Optional jsMode

jsMode?: boolean

It is possible to make the execution stay in JS. Provided in MongoDB > 2.0.X.

Optional verbose

verbose?: boolean

Provide statistics on job execution time.

Optional bypassDocumentValidation

bypassDocumentValidation?: boolean

Allow driver to bypass schema validation in MongoDB 3.2 or higher.

Optional session

session?: ClientSession

Specify ClientSession for this command

Optional willRetryWrite

willRetryWrite?: boolean

Optional readPreference

readPreference?: ReadPreferenceLike

The preferred read preference (ReadPreference.primary, ReadPreference.primary_preferred, ReadPreference.secondary, ReadPreference.secondary_preferred, ReadPreference.nearest).

Optional omitReadPreference

omitReadPreference?: boolean

Optional writeConcern

writeConcern?: WriteConcern | WriteConcernSettings

Write Concern as an object

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