v8.9.5

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==================

• fix: disallow nested $where in populate match CVE-2025-23061
• fix(schema): handle bitwise operators on Int32 #​15176 #​15170

v8.9.4

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==================

• fix(document): fix document not applying manual populate when using a function in schema.options.ref #​15138 IchirokuXVI
• fix(model): make Model.validate() static correctly cast document arrays #​15169 #​15164
• fix(model): allow passing validateBeforeSave option to bulkSave() to skip validation #​15161 #​15156
• fix(schema): allow multiple self-referencing discriminator schemas using Schema.prototype.discriminator #​15142 #​15120
• types: avoid BufferToBinary<> wiping lean types when passed to generic functions #​15160 #​15158
• docs: fix <code> in header ids #​15159
• docs: fix header in field-level-encryption.md #​15137 damieng

v8.9.3

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• fix(schema): make duplicate index error a warning for now to prevent blocking upgrading #​15135 #​15112 #​15109
• fix(model): handle document array paths set to non-array values in Model.castObject() #​15124 #​15075
• fix(document): avoid using childSchemas.path for compatibility with pre-Mongoose-8.8 schemas #​15131 #​15071
• fix(model): avoid throwing unnecessary error if updateOne() returns null in save() #​15126
• perf(cursor): clear the stack every time if using populate with batchSize to avoid stack overflows with large docs #​15136 #​10449
• types: make BufferToBinary avoid Document instances #​15123 #​15122
• types(model+query): avoid stripping out virtuals when calling populate with paths generic #​15132 #​15111
• types(schema): add missing removeIndex #​15134
• types: add cleanIndexes() to IndexManager interface #​15127
• docs: move search endpoint to netlify #​15119

v8.9.2

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• fix(schema): avoid throwing duplicate index error if index spec keys have different order or index has a custom name #​15112 #​15109
• fix(map): clean modified subpaths when overwriting values in map of subdocs #​15114 #​15108
• fix(aggregate): pull session from transaction local storage for aggregation cursors #​15094 IchirokuXVI
• types: correctly handle union types in BufferToBinary and related helpers #​15103 #​15102 #​15057
• types: add UUID to RefType #​15115 #​15101
• docs: remove link to Mongoose 5.x docs from dropdown #​15116
• docs(connection+document+model): remove remaining references to remove(), clarify that deleteOne() does not execute until then() or exec() #​15113 #​15107

v8.9.1

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• fix(connection): remove heartbeat check in load balanced mode #​15089 #​15042 #​14812
• fix(discriminator): gather childSchemas when creating discriminator to ensure $getAllSubdocs() can properly get all subdocs #​15099 #​15088 #​15092
• fix(model): handle discriminators in castObject() #​15096 #​15075
• fix(schema): throw error if duplicate index definition using unique in schema path and subsequent .index() call #​15093 #​15056
• fix: mark documents that are populated using hydratedPopulatedDocs option as populated in top-level doc #​15080 #​15048
• fix(document+schema): improve error message for get() on invalid path #​15098 #​15071
• docs: remove more callback doc references & some small other changes #​15095

v8.9.0

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• feat: upgrade mongodb -> 6.12
• feat: add int32 schematype #​15054 aditi-khare-mongoDB
• feat: add double schematype #​15061 aditi-khare-mongoDB
• feat: allow specifying error message override for duplicate key errors unique: true #​15059 #​12844
• feat(connection): add support for Connection.prototype.bulkWrite() with MongoDB server 8.0 #​15058 #​15028
• feat: add forceRepopulate option for populate() to allow avoiding repopulating already populated docs #​15044 #​14979
• fix(connection): remove heartbeat check in load balanced mode #​15089 #​15042
• fix(query): clone PopulateOptions when setting _localModel to avoid state leaking between subpopulate instances #​15082 #​15026
• types: add splice() to DocumentArray to allow adding partial objects with splice() #​15085 #​15041
• types(aggregate): add $firstN, $lastN, $bottom, $bottomN, $minN and $maxN operators #​15087 mlomnicki
• docs: Remove merge conflict markers #​15090 sponrad

v8.8.4

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• fix: cast using overwritten embedded discriminator key when set #​15076 #​15051
• fix: avoid throwing error if saveOptions undefined when invalidating subdoc cache #​15062

v8.8.3

Compare Source

==================

• fix: disallow using $where in match
• perf: cache results from getAllSubdocs() on saveOptions, only loop through known subdoc properties #​15055 #​15029
• fix(model+query): support overwriteDiscriminatorKey for bulkWrite updateOne and updateMany, allow inferring discriminator key from update #​15046 #​15040

v8.8.2

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• fix(model): handle array filters when casting bulkWrite #​15036 #​14978
• fix(model): make diffIndexes() avoid trying to drop default timeseries collection index #​15035 #​14984
• fix: save execution stack in query as string #​15039 durran
• types(cursor): correct asyncIterator and asyncDispose for TypeScript with lib: 'esnext' #​15038
• docs(migrating_to_8): add note about removing findByIdAndRemove #​15024 dragontaek-lee

v8.8.1

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==================

• perf: make a few micro-optimizations to help speed up findOne() #​15022 #​14906
• fix: apply embedded discriminators to subdoc schemas before compiling top level model so middleware applies correctly #​15001 #​14961
• fix(query): add overwriteImmutable option to allow updating immutable properties without disabling strict mode #​15000 #​8619

v8.8.0

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==================

• feat: upgrade mongodb -> ~6.10 #​14991 #​14877
• feat(query): add schemaLevelProjections option to query to disable schema-level select: false #​14986 #​11474
• feat: allow defining virtuals on arrays, not just array elements #​14955 #​2326
• feat(model): add applyTimestamps() function to apply all schema timestamps, including subdocuments, to a given POJO #​14943 #​14698
• feat(model): add hideIndexes option to syncIndexes() and cleanIndexes() #​14987 #​14868
• fix(query): make sanitizeFilter disable implicit $in #​14985 #​14657
• fix(model): avoid unhandled error if createIndex() throws a sync error #​14995
• fix(model): avoid throwing TypeError if bulkSave()'s bulkWrite() fails with a non-BulkWriteError #​14993
• types: added toJSON:flattenObjectIds effect #​14989
• types: add __v to lean() result type and ModifyResult #​14990 #​12959
• types: use globalThis instead of global for NativeDate #​14992 #​14988
• docs(change-streams): fix markdown syntax highlighting for script output example #​14994

v8.7.3

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==================

• fix(cursor): close underlying query cursor when calling destroy() #​14982 #​14966
• types: add JSONSerialized helper that can convert HydratedDocument to JSON output type #​14981 #​14451
• types(model): convert InsertManyResult to interface and remove unnecessary insertedIds override #​14977
• types(connection): add missing sanitizeFilter option #​14975
• types: improve goto definition for inferred schema definitions #​14968 forivall
• docs(migration-guide-v7): correct link to the section "Id Setter" #​14973 rb-ntnx

v8.7.2

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==================

• fix(document): recursively clear modified subpaths when setting deeply nested subdoc to null #​14963 #​14952
• fix(populate): handle array of ids with parent refPath #​14965
• types: make Buffers into mongodb.Binary in lean result type to match runtime behavior #​14967
• types: correct schema type inference when using nested typeKey like type: { type: String } #​14956 #​14950
• types: re-export DeleteResult and UpdateResult from MongoDB Node.js driver #​14947 #​14946
• docs(documents): add section on setting deeply nested properties, including warning about nullish coalescing assignment #​14972
• docs(model): add more info on acknowledged: false, specifically that Mongoose may return that if the update was empty #​14957

v8.7.1

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==================

• fix: set flattenObjectIds to false when calling toObject() for internal purposes #​14938
• fix: add mongodb 8 to test matrix #​14937
• fix: handle buffers stored in MongoDB as EJSON representation with { $binary } #​14932
• docs: indicate that Mongoose 8.7 is required for full MongoDB 8 support #​14937

v8.7.0

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==================

• feat(model): add Model.applyVirtuals() to apply virtuals to a POJO #​14905 #​14818
• feat: upgrade mongodb -> 6.9.0 #​14914
• feat(query): cast $rename to string #​14887 #​3027
• feat(SchemaType): add getEmbeddedSchemaType() method to SchemaTypes #​14880 #​8389
• fix(model): throw MongooseBulkSaveIncompleteError if bulkSave() didn't completely succeed #​14884 #​14763
• fix(connection): avoid returning readyState = connected if connection state is stale #​14812 #​14727
• fix: depopulate if push() or addToSet() with an ObjectId on a populated array #​14883 #​1635
• types: make __v a number, only set __v on top-level documents #​14892

v8.6.4

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==================

• fix(document): avoid massive perf degradation when saving new doc with 10 level deep subdocs #​14910 #​14897
• fix(model): skip applying static hooks by default if static name conflicts with aggregate middleware #​14904 dragontaek-lee
• fix(model): filter applying static hooks by default if static name conflicts with mongoose middleware #​14908 dragontaek-lee

v8.6.3

Compare Source

==================

• fix: make getters convert uuid to string when calling toObject() and toJSON() #​14890 #​14869
• fix: fix missing Aggregate re-exports for ESM #​14886 wongsean
• types(document): add generic param to depopulate() to allow updating properties #​14891 #​14876

v8.6.2

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==================

• fix: make set merge deeply nested objects #​14870 #​14861 ianHeydoc
• types: allow arbitrary keys in query filters again (revert #​14764) #​14874 #​14863 #​14862 #​14842
• types: make SchemaType static setters property accessible in TypeScript #​14881 #​14879
• type(inferrawdoctype): infer Date types as JS dates rather than Mongoose SchemaType Date #​14882 #​14839

v8.6.1

Compare Source

==================

• fix(document): avoid unnecessary clone() in applyGetters() that was preventing getters from running on 3-level deep subdocuments #​14844 #​14840 #​14835
• fix(model): throw error if bulkSave() did not insert or update any documents #​14837 #​14763
• fix(cursor): throw error in ChangeStream constructor if changeStreamThunk() throws a sync error #​14846
• types(query): add $expr to RootQuerySelector #​14845
• docs: update populate.md to fix missing match: { } #​14847 makhoulshbeeb

v8.6.0

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==================

• feat: upgrade mongodb -> 6.8.0, handle throwing error on closed cursor in Mongoose with MongooseError instead of MongoCursorExhaustedError #​14813
• feat(model+query): support options parameter for distinct() #​14772 #​8006
• feat(QueryCursor): add getDriverCursor() function that returns the raw driver cursor #​14745
• types: change query selector to disallow unknown top-level keys by default #​14764 alex-statsig
• types: make toObject() and toJSON() not generic by default to avoid type widening #​14819 #​12883
• types: avoid automatically inferring lean result type when assigning to explicitly typed variable #​14734

v8.5.5

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==================

• fix(populate): fix a couple of other places where Mongoose gets the document's _id with getters #​14833 #​14827 #​14759
• fix(discriminator): shallow clone Schema.prototype.obj before merging schemas to avoid modifying original obj #​14821
• types: fix schema type based on timestamps schema options value #​14829 #​14825 ark23CIS

v8.5.4

Compare Source

==================

• fix: add empty string check for collection name passed #​14806 Shubham2552
• docs(model): add 'throw' as valid strict value for bulkWrite() and add some more clarification on throwOnValidationError #​14809

v8.5.3

Compare Source

==================

• fix(document): call required functions on subdocuments underneath nested paths with correct context #​14801 #​14788
• fix(populate): avoid throwing error when no result and lean() set #​14799 #​14794 #​14759 MohOraby
• fix(document): apply virtuals to subdocuments if parent schema has virtuals: true for backwards compatibility #​14774 #​14771 #​14623 #​14394
• types: make HydratedSingleSubdocument and HydratedArraySubdocument merge types instead of using & #​14800 #​14793
• types: support schema type inference based on schema options timestamps as well #​14773 #​13215 ark23CIS
• types(cursor): indicate that cursor.next() can return null #​14798 #​14787
• types: allow mongoose.connection.db to be undefined #​14797 #​14789
• docs: add schema type widening advice #​14790 JstnMcBrd

v8.5.2

Compare Source

==================

• perf(clone): avoid further unnecessary checks if cloning a primitive value #​14762 #​14394
• fix: allow setting document array default to null #​14769 #​14717 #​6691
• fix(model): support session: null option for save() to opt out of automatic session option with transactionAsyncLocalStorage #​14744 #​14736
• fix(model+document): avoid depopulating manually populated doc as getter value #​14760 #​14759
• fix: correct shardkey access in buildBulkWriteOps #​14753 #​14752 adf0nt3s
• fix(query): handle casting $switch in $expr #​14755 #​14751
• types: allow calling SchemaType.cast() without parent and init parameters #​14756 #​14748 #​9076
• docs: fix a wrong example in v6 migration guide #​14758 abdelrahman-elkady

v8.5.1

Compare Source

==================

• perf(model): performance improvements for insertMany() #​14724
• fix(model): avoid leaving subdoc defaults on top-level doc when setting subdocument to same value #​14728 #​14722
• fix(model): handle transactionAsyncLocalStorage option with insertMany() #​14743
• types: make _id required on Document type #​14735 #​14660
• types: fix ChangeStream.close to return a Promise like the driver #​14740 orgads

v8.5.0

Compare Source

==================

• perf: memoize toJSON / toObject default options #​14672
• feat(document): add $createModifiedPathsSnapshot(), $restoreModifiedPathsSnapshot(), $clearModifiedPaths() #​14699 #​14268
• feat(query): make sanitizeProjection prevent projecting in paths deselected in the schema #​14691
• feat: allow setting array default value to null #​14717 #​6691
• feat(mongoose): allow drivers to set global plugins #​14682
• feat(connection): bubble up monitorCommands events to Mongoose connection if monitorCommands option set #​14681 #​14611
• fix(document): ensure post('deleteOne') hooks are called when calling save() after subdoc.deleteOne() #​14732 #​9885
• fix(query): remove count() and findOneAndRemove() from query chaining #​14692 #​14689
• fix: remove default connection if setting createInitialConnection to false after Mongoose instance created #​14679 #​8302
• types(models+query): infer return type from schema for 1-level deep nested paths #​14632
• types(connection): make transaction() return type match the executor function #​14661 #​14656
• docs: fix docs links in index.md mirasayon

v8.4.5

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==================

• types: correct this for validate.validator schematype option #​14720 #​14696
• docs(model): note that insertMany() with lean skips applying defaults #​14723 #​14698

v8.4.4

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==================

• perf: avoid unnecesary get() call and use faster approach for converting to string #​14673 #​14394
• fix(projection): handle projections on arrays in Model.hydrate() projection option #​14686 #​14680
• fix(document): avoid passing validateModifiedOnly to subdocs so subdocs get fully validating if they're directly modified #​14685 #​14677
• fix: handle casting primitive array with $elemMatch in bulkWrite() #​14687 #​14678
• fix(query): cast $pull using embedded discriminator schema when discriminator key is set in filter #​14676 #​14675
• types(connection): fix return type of withSession() #​14690 tt-public
• types: add $documents pipeline stage and fix $unionWith type #​14666 nick-statsig
• docs(findoneandupdate): improve example that shows findOneAndUpdate() returning doc before updates were applied #​14671 #​14670

v8.4.3

Compare Source

==================

• fix: remove 0x flamegraph files from release

v8.4.2

Compare Source

==================

• perf: more toObject() perf improvements #​14623 #​14606 #​14394
• fix(model): check the value of overwriteModels in options when calling discriminator() #​14646 uditha-g
• fix: avoid throwing TypeError when deleting an null entry on a populated Map #​14654 futurliberta
• fix(connection): fix up some inconsistencies in operation-end event and add to docs #​14659 #​14648
• types: avoid inferring Boolean, Buffer, ObjectId as Date in schema definitions under certain circumstances #​14667 #​14630
• docs: add note about parallelism in transations #​14647 fiws

v8.4.1

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==================

• fix: pass options to clone instead of get in applyVirtuals #​14606 #​14543 andrews05
• fix(document): fire pre validate hooks on 5 level deep single nested subdoc when modifying after save() #​14604 #​14591
• fix: ensure buildBulkWriteOperations target shard if shardKey is set #​14622 #​14621 matlpriceshape
• types: pass DocType down to subdocuments so HydratedSingleSubdocument and HydratedArraySubdocument toObject() returns correct type #​14612 #​14601

v8.4.0

Compare Source

==================

• feat: upgrade mongodb -> 6.6.2 #​14584
• feat: add transactionAsyncLocalStorage option to opt in to automatically setting session on all transactions #​14583 #​13889
• feat: handle initially null driver when instantiating Mongoose for Rollup support #​14577 #​12335
• feat(mongoose): export omitUndefined() helper #​14582 #​14569
• feat: add Model.listSearchIndexes() #​14519 #​14450
• feat(connection): add listDatabases() function #​14506 #​9048
• feat(schema): add schema-level readConcern option to apply default readConcern for all queries #​14579 #​14511
• fix(error): remove model property from CastError to avoid printing all model properties to console #​14568 #​14529
• fix(model): make bulkWrite() and insertMany() throw if throwOnValidationError set and all ops invalid #​14587 #​14572
• fix(document): ensure transform function passed to toObject() options applies to subdocs #​14600 #​14589
• types: add inferRawDocType helper #​13900 #​13772
• types(document): make document _id type default to unknown instead of any #​14541

v8.3.5

Compare Source

==================

• fix(query): shallow clone $or, $and if merging onto empty query filter #​14580 #​14567
• types(model+query): pass TInstanceMethods to QueryWithHelpers so populated docs have methods #​14581 #​14574
• docs(typescript): clarify that setting THydratedDocumentType on schemas is necessary for correct method context #​14575 #​14573

v8.3.4

Compare Source

==================

• perf(document): avoid cloning options using spread operator for perf reasons #​14565 #​14394
• fix(query): apply translateAliases before casting to avoid strictMode error when using aliases #​14562 #​14521
• fix(model): consistent top-level timestamps option for bulkWrite operations
  #​14546 #​14536
• docs(connections): improve description of connection creation patterns #​14564 #​14528

v8.3.3

Compare Source

==================

• perf(document): add fast path for applying non-nested virtuals to JSON #​14543
• fix: make hydrate() recursively hydrate virtual populate docs if hydratedPopulatedDocs is set #​14533 #​14503
• fix: improve timestamps option handling in bulkWrite #​14546 #​14536 sderrow
• fix(model): make recompileSchema() overwrite existing document array discriminators #​14527
• types(schema): correctly infer Array<Schema.Types.*> #​14534 #​14367
• types(query+populate): apply populate overrides to doc toObject() result #​14525 #​14441
• types: add null to select override return type for findOne #​14545 sderrow

v8.3.2

Compare Source

==================

• fix(populate): avoid match function filtering out null values in populate result #​14518 #​14494
• types(query): make FilterQuery props resolve to any for generics support #​14510 #​14473 #​14459
• types(DocumentArray): pass DocType generic to Document for correct toJSON() and toObject() return types #​14526 #​14469
• types(models): fix incorrect bulk write options #​14513 emiljanitzek
• docs: add documentation for calling schema.post() with async function #​14514 #​14305

v8.3.1

Compare Source

==================

• fix(document): make update minimization unset property rather than setting to null #​14504 #​14445
• fix(model): make Model.recompileSchema() also re-apply discriminators #​14500 #​14444
• fix(schema): deduplicate idGetter so creating multiple models with same schema doesn't result in multiple id getters #​14492
• fix: update kareem -> 2.6.3 for index.d.ts #​14508 #​14497
• fix(mongoose): make setDriver() update mongoose.model() connections and collections #​14505
• types(validation): support function for validator message property, and add support for accessing validator reason #​14499 #​14496
• docs: remove typo #​14501 epmartini

v8.3.0

Compare Source

==================

• feat(document): add validateAllPaths option to validate() and validateSync() #​14467 #​14414
• feat: pathsToSave option to save() function #​14385 #​9583
• feat(query): add options parameter to Query.prototype.sort() #​14375 #​14365
• feat: add function SchemaType.prototype.validateAll #​14434 #​6910
• fix: handle array schema definitions with of keyword #​14447 #​14416
• types: add overwriteMiddlewareResult and skipMiddlewareFunction to types #​14328 #​14829

v8.2.4

Compare Source

==================

• types(query): bring "getFilter" and "getQuery" in-line with "find" and other types #​14463 noseworthy
• types(schema): re-export the defintion for SearchIndexDescription #​14464
• docs: removed unused hook from docs #​14461 bernardarhia

v8.2.3

Compare Source

==================

• fix(schema): avoid returning string 'nested' as schematype [#