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mongodb-pipeline-builder

mongodb-pipeline-builder is a pipeline builder for the db.collection.aggregate, the db.aggregate and the mongoose Model.aggregate methods.

Simplify pipelines by making them more readable
Pipelines are easier to edit.
Pipeline stages appear in an array.
Sequential stages for documents

All stages except the Out, Merge, GeoNear, ChangeStream, ChangeStreamSplitLargeEvent and Paging stages can appear multiple times in a pipeline.

npm package

npm i -S mongodb-pipeline-builder

News and Breaking changes between v3 and v4

PipelineBuilder:

Renaming getPipeline() with build()
Added new stages: ChangeStream, ChangeStreamSplitLargeEvent, Densify, Documents, Fill, ListLocalSessions, ListSampledQueries, ListSearchIndexes, SearchMeta, SetWindowFields and ShardedDataDistribution.
Added the possibility to insert stages without validation.
Checking for non-duplicable stages.

Helpers:

Replacing the Payload suffix with Helper suffix
Prefixed with the name of the pipeline stage where they should be used

Operators:

Prefixed with the $ symbol
Rename MapOperator to $Map

GetResult:

To be used if no Paging stage is set
Removing GetDocs method arguments
Added new GetElement method to the response object

GetPagingResult:

To be used exclusively with Paging stage.

Welcome generics! GetResult<Type> and GetPagingResult<Type> now offer the ability to type responses.

Usage:

Using `require()`

const PipelineBuilder = require("mongodb-pipeline-builder").PipelineBuilder;
const { LookupEqualityHelper, ProjectOnlyHelper, Field } = require('mongodb-pipeline-builder/helpers');
const { $LessThanEqual, $ArrayElementAt, $Equal, $Expression } = require('mongodb-pipeline-builder/operators');

Using `import`

import { PipelineBuilder } from 'mongodb-pipeline-builder';
import { LookupEqualityHelper, ProjectOnlyHelper, Field } from 'mongodb-pipeline-builder/helpers';
import { $LessThanEqual, $ArrayElementAt, $Equal, $Expression } from 'mongodb-pipeline-builder/operators';

Pagination example

const myNewPipeline = new PipelineBuilder( 'myPagination', { debug: true } )
    .Match( $Expression( $LessThanEqual( '$id', 20 ) ) )
    .Project( ProjectOnlyHelper( 'name', 'weight' ) )
    .Paging( 5, 3 ) // 5 per page, page 3
    .build();

is equivalent to

const myNewPipeline = [ {
    $facet: {
        docs: [
            { $match: { $expr: { $lte: ["$id", 20] } } },
            { $project: { _id: 0, name: 1, weight: 1 } },
            { $skip: 10 },
            { $limit: 5 }
        ],
        count: [
            { $match: { $expr: { $lte: ["$id", 20] } } },
            { $count: "totalElements" }
        ]
    }
} ];

No pagination example

const myNewPipeline = new PipelineBuilder( 'user-skills' )
    .Match( $Expression( $Equal( '$id', 123456 ) ) )
    .Lookup( LookupEqualityHelper( 'profiles', 'profile', 'id', 'profileId' ) )
    .Project( ProjectOnlyHelper( 'firstname', 'lastname', 'email' ) )
    .AddFields(
        Field( 'skills', $ArrayElementAt( '$profile.skills', 0 ) ),
        Field( 'availability', $ArrayElementAt( '$profile.availability', 0 ) )
    )
    .Unset( 'profile' )
    .build();

is equivalent to

const myNewPipeline = [
    { $match: { $expr: { $eq: ["$id", 123456] } } },
    { $lookup: { from: "profiles", as: "profile", localField: "id", foreignField: "profileId" } },
    { $project: { _id: 0, firstname: 1, lastname: 1, email: 1 } },
    { $addFields: {
        skills: { $arrayElemAt: ["$profile.skills", 0] },
        availability: { $arrayElemAt: ["$profile.availability", 0] }
    } },
    { $unset: "profile" }
];

GetResult method (No pagination)

GetResult<T>(): Promise<GetResultResponse<T>>

GetResult<T>() is an asynchronous method that provides a very easy way to use aggregation responses.

This method returns a GetResultResponse object that contains 3 methods:

GetDocs(): T[] to get all the documents that match the request.
GetElement(index: number | 'last'): T to get a particular document by its index.
GetCount(): number to get the total number of documents found.

const result = await GetResult<DocType>( target, pipeline ); 
result.GetDocs(); // () => DocType[]
result.GetElement(index | 'last'); // () => DocType | undefined
result.GetCount(); // () => number

$Or

GetResult<DocType>( target, pipeline ).then( result => {
    result.GetDocs(); // () => DocType[]
    result.GetElement(index | 'last'); // () => DocType | undefined
    result.GetCount(); // () => number
} );

`GetElement(index: number | 'last')` method possibilities:

A particular document can be retrieved by specifying its index.
To get the last document, simply provide the string 'last'.
If the specified index is greater than the index of the last document, GetElement() will return undefined.

// GetDocs() -> [document1, document2, document3, ..., document51]
result.GetElement(2); // will return document to index 2, document3
result.GetElement('last'); // will return the last document, document51
result.GetElement(99); // will return undefined

GetPagingResult method (Pagination)

GetPagingResult<T>(): Promise<GetPagingResultResponse<T>>

GetPagingResult<T>() is an asynchronous method that provides a very easy way to use aggregation responses when Paging stage is used.

This method returns a GetPagingResultResponse object that contains three methods:

GetDocs() to get the documents found.
GetCount() to get the total number of documents found.
GetTotalPageNumber() to get the total number of pages.

const result = await GetPagingResult<DocType>(target, pipeline);
result.GetDocs(); // () => DocType[]
result.GetCount(); // () => number
result.GetTotalPageNumber(); // () => number

$Or

GetPagingResult<DocType>(target, pipeline).then( result => {
    result.GetDocs(); // () => DocType[]
    result.GetCount(); // () => number
    result.GetTotalPageNumber(); // () => number
} );

=> Try the lib on NPM RunKit with the require method <=

// builder = new PipelineBuilder('example');

CUSTOM STAGES

Paging(elementsPerPage, page)

The Paging stage automatically adds 3 native stages used to paginate documents ($skip, $limit and $count).
Page is optional and defaults to 1.

builder.Paging(5, 2).build();

// pipeline
[
  {
    $facet: {
      docs: [ { '$skip': 5 }, { '$limit': 5 } ],
      count: [ { '$count': 'totalElements' } ]
    }
  }
]

InsertStage(stage)

The InsertStage stage allows you to insert a stage without validation.
Usefully when you need to insert a stage that is not yet implemented or when the value fails validation but for some reason you want to keep it.

builder.InsertStage({ '$myCustomStage': { myField: 'myValue' } }).build();

// pipeline
[ { $myCustomStage: { myField: 'myValue' } } ]

MONGODB STAGES

AddFields(...values)

Helper: `Field(name, value)`

builder.AddFields(
  Field('foo', 'value1'),
  Field('bar', 'value2'),
).build();

// pipeline
[ { $addFields: { foo: 'value1', bar: 'value2' } } ]

Bucket(value)

Helper: `BucketHelper(groupBy, boundaries, optional)`

builder.Bucket(BucketHelper('$age', [6, 13, 18])).build();

// pipeline
[ { $bucket: { groupBy: '$age', boundaries: [ 6, 13, 18 ] } } ]

BucketAuto(value)

Helper: `BucketAutoHelper(groupBy, buckets, optional)`

builder.BucketAuto(BucketAutoHelper('$age', 5)).build();

// pipeline
[ { $bucketAuto: { groupBy: '$age', buckets: 5 } } ]

ChangeStream(value)

Helper: `ChangeStreamHelper(optional)`

builder.ChangeStream(ChangeStreamHelper()).build();

// pipeline
[ { $changeStream: {} } ]

ChangeStreamSplitLargeEvent()

builder.ChangeStreamSplitLargeEvent().build();

// pipeline
[ { $changeStreamSplitLargeEvent: {} } ]

CollStats(value)

Helper: `CollStatsHelper(optional)`

builder.CollStats(CollStatsHelper()).build();

// pipeline
[ { $collStats: {} } ]

Count(value)

builder.Count('counter').build();

// pipeline
[ { $count: 'counter' } ]

CurrentOp(value)

Helper: `CurrentOpHelper(optional)`

builder.CurrentOp(CurrentOpHelper()).build();

// pipeline
[ { $currentOp: {} } ]

Densify(value)

Helper: `DensifyHelper(field, range, optional)`

builder.Densify(
    DensifyHelper(
      'altitude',
      { bounds: 'full', step: 200 },
      { partitionByFields: [ 'variety' ] }
    ),
).build();

// pipeline
[
  {
    $densify: {
      field: 'altitude',
      range: { bounds: 'full', step: 200 }
      partitionByFields: [ 'variety' ],
    }
  }
]

Documents(...values)

builder.Documents({ doc1Id: 1 }, { doc2Id: 2 }, { doc3Id: 3 }).build();

// pipeline
[ { $documents: [ { doc1Id: 1 }, { doc2Id: 2 }, { doc3Id: 3 } ] } ]

Facet(...values)

Helper: `Field(name, pipeline)`

builder.Facet(
  Field('pipeline1', [{ $match: { tag: 'first' }}]),
  Field('pipeline2', [{ $match: { tag: 'second' }}]),
  Field('pipeline3', [{ $match: { tag: 'third' }}]),
).build();

// pipeline
[
  {
    $facet: {
      pipeline1: [ { '$match': { tag: 'first' } } ],
      pipeline2: [ { '$match': { tag: 'second' } } ],
      pipeline3: [ { '$match': { tag: 'third' } } ]
    }
  }
]

Fill(value)

Helper: `FillHelper(output, optional)`

builder.Fill(
  FillHelper({
    bootsSold: { value: 0 },
    sandalsSold: { value: 0 },
    sneakersSold: { value: 0 },
  }),
).build();

// pipeline
[
  {
    $fill: {
      output: {
        bootsSold: { value: 0 },
        sandalsSold: { value: 0 },
        sneakersSold: { value: 0 }
      }
    }
  }
]

GeoNear(value)

Helper: `GeoNearHelper(near, distanceField, optional)`

builder.GeoNear(
  GeoNearHelper({ type: "Point", coordinates: [ -73.99279 , 40.719296 ] }, 'calculated')
).build();

// pipeline
[
  {
    $geoNear: {
      near: { type: 'Point', coordinates: [ -73.99279, 40.719296 ] },
      distanceField: 'calculated'
    }
  }
]

GraphLookup(value)

builder.GraphLookup({
  from: 'employees', startWith: '$reportsTo', connectFromField: 'reportsTo', connectToField: 'name', as: 'reportingHierarchy',
}).build();

// pipeline
[
  {
    $graphLookup: {
      from: 'employees',
      startWith: '$reportsTo',
      connectFromField: 'reportsTo',
      connectToField: 'name',
      as: 'reportingHierarchy'
    }
  }
]

Group(value)

builder.Group({ _id: null, count: { $count: { } } }).build();

// pipeline
[
  { $group: { _id: null, count: { '$count': {} } } }
]

IndexStats()

builder.IndexStats().build();

// pipeline
[ { $indexStats: {} } ]

Limit(value)

builder.Limit(10).build();

// pipeline
[ { $limit: 10 } ]

ListLocalSessions(value)

builder.ListLocalSessions({ allUsers: true }).build();

// pipeline
[ { $listLocalSessions: { allUsers: true } } ]

ListSampledQueries(value)

builder.ListSampledQueries({ namespace: "social.post" }).build();

// pipeline
[ { $listSampledQueries: { namespace: 'social.post' } } ]

ListSearchIndexes(value)

builder.ListSearchIndexes({ name: 'searchIndex01' }).build();

// pipeline
[ { $listSearchIndexes: { name: 'searchIndex01' } } ]

ListSessions(value)

builder.ListSessions({ allUsers: true }).build();

// pipeline
[ { $listSessions: { allUsers: true } } ]

Lookup(value)

Helper: `LookupConditionHelper(from, as, optional)`

builder.Lookup(LookupConditionHelper('users', 'users')).build();

// pipeline
[ { $lookup: { from: 'users', as: 'users' } } ]

Helper: `LookupEqualityHelper(from, as, localField, foreignField)`

builder.Lookup(
  LookupEqualityHelper('users', 'users', 'userId', 'id')
).build();

// pipeline
[
  {
    $lookup: {
      from: 'users',
      localField: 'userId',
      foreignField: 'id',
      as: 'users'
    }
  }
]

Match(value)

Helper: `Field(name, value)`

builder.Match(Field('age', 18)).build();

// pipeline
[ { $match: { age: 18 } } ]

Operator: `$Expression`

builder.Match($Expression($GreaterThanEqual('$age', 18))).build();

// pipeline
[ { $match: { '$expr': { '$gte': [ '$age', 18 ] } } } ]

Merge(value)

Helper: `MergeHelper(into, optional)`

builder.Merge(MergeHelper('newCollection')).build();

// pipeline
[ { $merge: { into: 'newCollection' } } ]

Out(value)

Helper: `OutHelper(collection, optional)`

builder.Out(OutHelper('users')).build();

// pipeline
[ { $out: 'users' } ]

PlanCacheStats()

builder.PlanCacheStats().build();

// pipeline
[ { $planCacheStats: {} } ]

Project(...values)

Helper: `ProjectHelper(field, value)`

builder.Project(
  ProjectHelper('age', '$user.age'),
  ProjectHelper(
    'nickname',
    {
      $cond: {
        if: { $eq: [ '', '$user.nickname' ] },
        then: '$$REMOVE',
        else: '$user.nickname',
      },
    },
  ),
).build();

// pipeline
[
  {
    $project: {
      age: '$user.age',
      nickname: {
        $cond: {
          if: { $eq: [ '', '$user.nickname' ] },
          then: '$$REMOVE',
          else: '$user.nickname'
        }
      }
    }
  }
]

Helper: `ProjectIgnoreHelper(...fields)`

builder.Project(ProjectIgnoreHelper('password', 'refreshToken')).build();

// pipeline
[ { $project: { password: 0, refreshToken: 0 } } ]

Helper: `ProjectOnlyHelper(...fields)`

builder.Project(ProjectOnlyHelper('password', 'refreshToken')).build();

// pipeline
[ { $project: { _id: 0, password: 1, refreshToken: 1 } } ]

Redact(value)

builder.Redact(
  $Condition(
    $GreaterThan($Size($SetIntersection('$tags', ['STLW', 'G'])), 0),
    '$$DESCEND',
    '$$PRUNE'
  )
).build();

// pipeline
[
  {
    $redact: {
      '$cond': [
        { '$gt': [ { '$size': { '$setIntersection': [ '$tags', [ 'STLW', 'G' ] ] } }, 0 ] },
        '$$DESCEND',
        '$$PRUNE'
      ]
    }
  }
]

ReplaceRoot(value)

builder.ReplaceRoot({
  newRoot: { full_name: { $concat : [ "$first_name", " ", "$last_name" ] } }
}).build();

// pipeline
[
  {
    $replaceRoot: {
      newRoot: {
        full_name: { '$concat': [ '$first_name', ' ', '$last_name' ] }
      }
    }
  }
]

ReplaceWith(value)

builder.ReplaceWith('$name').build();

// pipeline
[ { $replaceWith: '$name' } ]

Sample(value)

Helper: `SampleHelper(size)`

builder.Sample(SampleHelper(6)).build();

// pipeline
[ { $sample: { size: 6 } } ]

Search(value)

Helper: `SearchHelper(operator | collector, optional)`

builder.Search(
  SearchHelper({
    near: { path: 'released', origin: date, pivot: 7776000000 },
  }),
).build();

// pipeline
[
  {
    $search: {
      near: { path: 'released', origin: date, pivot: 7776000000 },
    },
  }
]

SearchMeta(value)

Helper: `SearchMetaHelper(collector, optional)`

builder.SearchMeta(
  SearchMetaHelper({
    facet: {
      operator: {
        near: { path: 'released', origin: date, pivot: 7776000000 },
      },
      facets: {
        test: { type: 'number', path: 'released', boundaries: [0, 100] },
      },
    },
  })
).build();

// pipeline
[
  {
    $searchMeta: {
      facet: {
        operator: {
          near: { path: 'released', origin: date, pivot: 7776000000 },
        },
        facets: {
          test: { type: 'number', path: 'released', boundaries: [0, 100] },
        },
      },
    }
  }
]

Set(...values)

Helper: `Field(name, value)`

builder.Set(Field('first', true), Field('second', 2)).build();

// pipeline
[ { $set: { first: true, second: 2 } } ]

SetWindowFields(value)

builder.SetWindowFields({
  partitionBy: "$state",
  sortBy: { orderDate: 1 },
  output: {
    cumulativeQuantityForState: {
      $sum: "$quantity",
      window: { documents: [ "unbounded", "current" ] }
    }
  }
}).build();

// pipeline
[
  {
    $setWindowFields: {
      partitionBy: '$state',
      sortBy: { orderDate: 1 },
      output: {
        cumulativeQuantityForState: {
          '$sum': '$quantity',
          window: { documents: [ 'unbounded', 'current' ] }
        }
      }
    }
  }
]

ShardedDataDistribution(value)

builder.ShardedDataDistribution({}).build();

// pipeline
[ { $shardedDataDistribution: {} } ]

Skip(value)

builder.Skip(100).build();

// pipeline
[ { $skip: 100 } ]

Sort(...values)

Helper: `Field(name, value)`

builder.Sort(
  Field('first', -1),
  Field('second', 1),
  Field('third', { $meta: "textScore" }),
).build();

// pipeline
[
  {
    $sort: { first: -1, second: 1, third: { '$meta': 'textScore' } }
  }
]

SortByCount(value)

builder.SortByCount('$employee').build();
// pipeline

[ { $sortByCount: '$employee' } ]

UnionWith(value)

Helper: `UnionWithHelper(collection, pipeline)`

builder.UnionWith(
  UnionWithHelper('cars'),
).build();

// pipeline
[
  {
    $unionWith: { coll: 'cars' }
  }
]

builder.UnionWith(
  UnionWithHelper(
    undefined,
    [{ $document: [{ ref: 1 }, { ref: 2 }, { ref: 3 }],  }]),
).build();

// pipeline
[
  {
    $unionWith: { pipeline: [ { '$document': [ { ref: 1 }, { ref: 2 }, { ref: 3 } ] } ] }
  }
]

builder.UnionWith(
  UnionWithHelper('cars', [{ $match: { color: 'red' } }]),
).build();

// pipeline
[
  {
    $unionWith: { coll: 'cars', pipeline: [ { '$match': { color: 'red' } } ] }
  }
]

Unset(...values)

builder.Unset('users', 'roles').build();

// pipeline
[ { $unset: [ 'users', 'roles' ] } ]

Unwind(value)

builder.Unwind({ path: '$sizes', preserveNullAndEmptyArrays: true }).build();

// pipeline
[ { $unwind: { path: '$sizes', preserveNullAndEmptyArrays: true } } ]

MONGODB OPERATORS

$Absolute

$Absolute(-5)

// operator
{ $abs: -5 }

$Accumulator

$Accumulator(
  () => ({ count: 0, sum: 0 }),
  (state: { count: number; sum: number; }, numCopies: number) => ({
    count: state.count + 1,
    sum: state.sum + numCopies,
  }),
  ['$copies'],
  (state1: { count: number; sum: number; }, state2: { count: number; sum: number; }) => ({
    count: state1.count + state2.count,
    sum: state1.sum + state2.sum,
  }),
  { finalize: (state: { sum: number; count: number; }) => (state.sum / state.count) },
)

// operator
{
  '$accumulator': {
    init: [ () => ({ count: 0, sum: 0 }) ],
    accumulate: [
      (state: { count: number; sum: number; }, numCopies: number) => ({
        count: state.count + 1,
        sum: state.sum + numCopies,
      })
    ],
    accumulateArgs: [ '$copies' ],
    merge: [
      (state1: { count: number; sum: number; }, state2: { count: number; sum: number; }) => ({
        count: state1.count + state2.count,
        sum: state1.sum + state2.sum,
      })
    ],
    finalize: [ (state: { sum: number; count: number; }) => (state.sum / state.count) ],
    lang: 'js'
  }
}

$ArcCosine

$ArcCosine({ $divide : [ '$side_b', '$hypotenuse' ] })

// operator
{ '$acos': { '$divide': [ '$side_b', '$hypotenuse' ] } }

$ArcCosineHyperbolic

$ArcCosineHyperbolic(3)

// operator
{ '$acosh': 3 }

$Add

$Add('$price', 10)

// operator
{ '$add': [ '$price', 10 ] }

$AddToSet

$AddToSet('$item')

// operator
{ '$addToSet': '$item' }

$AllElementsTrue

$AllElementsTrue([ true, 1, "someString" ])

// operator
{ '$allElementsTrue': [ [ true, 1, 'someString' ] ] }

$And

$And(1, 'green')

// operator
{ '$and': [ 1, 'green' ] }

$AnyElementTrue

$AnyElementTrue([ true, false ])

// operator
{ '$anyElementTrue': [ [ true, false ] ] }

$ArrayElementAt

$ArrayElementAt([ 1, 2, 3 ], 0)

// operator
{ '$arrayElemAt': [ [ 1, 2, 3 ], 0 ] }

$ArrayToObject

$ArrayToObject([ { "k": "item", "v": "abc123" }, { "k": "qty", "v": "$qty" } ])

// operator
{ '$arrayToObject': [ { k: 'item', v: 'abc123' }, { k: 'qty', v: '$qty' } ] }

$ArrayToObject([ [ "item", "abc123" ], [ "qty", 25 ] ], true)              

// operator
{ '$arrayToObject': { '$literal': [ [ 'item', 'abc123' ], [ 'qty', 25 ] ] } }

$ArcSine

$ArcSine('$value')

// operator
{ '$asin': '$value' }

$ArcSineHyperbolic

$ArcSineHyperbolic('$value')

// operator
{ '$asinh': '$value' }

$ArcTangent

$ArcTangent('$value')

// operator
{ '$atan': '$value' }

$ArcTangent2

$ArcTangent2('$side_b', '$side_a')

// operator
{ '$atan2': [ '$side_b', '$side_a' ] }

$ArcTangentHyperbolic

$ArcTangentHyperbolic('$value')

// operator
{ '$atanh': '$value' }

$Average

$Average('$value')

// operator
{ '$avg': '$value' }

$Average('$value1', '$value2', '$value3')

// operator
{ '$avg': [ '$value1', '$value2', '$value3' ] }

$BinarySize

$BinarySize('Hello World!')

// operator
{ '$binarySize': 'Hello World!' }

$BitwiseAnd

$BitwiseAnd('$array')

// operator
{ '$bitAnd': '$array' }

$BitwiseAnd(0, 127, 5)

// operator
{ '$bitAnd': [ 0, 127, 5 ] }

$BitwiseNot

$BitwiseNot('$long')

// operator
{ '$bitNot': '$long' }

$BitwiseOr

$BitwiseOr('$array')

// operator
{ '$bitOr': '$array' }

$BitwiseOr(0, 127, 5)

// operator
{ '$bitOr': [ 0, 127, 5 ] }

$BitwiseXor

$BitwiseXor('$array')

// operator
{ '$bitXor': '$array' }

$BitwiseXor(0, 127, 5)

// operator
{ '$bitXor': [ 0, 127, 5 ] }

$Bottom

$Bottom(['field1', 'field2'], { field2: -1 })

// operator
{ '$bottom': { output: [ 'field1', 'field2' ], sortBy: { field2: -1 } } }

$BottomN

$BottomN('field', { field: 1 }, 3)

// operator
{ '$bottomN': { output: 'field', sortBy: { field: 1 }, n: 3 } }

$BsonSize

$BsonSize('$$ROOT')

// operator
{ '$bsonSize': '$$ROOT' }

$Ceil

$Ceil('$value')

// operator
{ '$ceil': '$value' }

$Compare

$Compare('$age', 25)

// operator
{ '$cmp': [ '$age', 25 ] }

$Concat

$Concat('$first', ' - ', '$second')

// operator
{ '$concat': [ '$first', ' - ', '$second' ] }

$ConcatArrays

$ConcatArrays('$array', [1, 2, 3])

// operator
{ '$concatArrays': [ '$array', [ 1, 2, 3 ] ] }

$Condition

$Condition({ $gte: [ '$quantity', 250 ] }, 'true', 'false')

// operator
{ '$cond': [ { '$gte': [ '$quantity', 250 ] }, 'true', 'false' ] }

$Convert

$Convert(100, 'bool')

// operator
{ '$convert': { input: 100, to: 'bool' } }

$Cosine

$Cosine('$angle')

// operator
{ '$cos': '$angle' }

$CosineHyperbolic

$CosineHyperbolic({ $degreesToRadians : "$angle" })

// operator
{ '$cosh': { '$degreesToRadians': '$angle' } }

$Count

$Count()

// operator
{ '$count': {} }

$CovariancePopulation

$CovariancePopulation('$numeric1', '$numeric2')

// operator
{ '$covariancePopulation': [ '$numeric1', '$numeric2' ] }

$CovarianceSample

$CovarianceSample('$numeric1', '$numeric2')

// operator
{ '$covarianceSample': [ '$numeric1', '$numeric2' ] }

$DateAdd

$DateAdd('$startDate', 'hour', 2)

// operator
{ '$dateAdd': { startDate: '$startDate', unit: 'hour', amount: 2 } }

$DateDifference

$DateDifference('$startDate', '$endDate', 'second')

// operator
{ '$dateDiff': { startDate: '$startDate', endDate: '$endDate', unit: 'second' } }

$DateFromParts

$DateFromCalendarParts(2000, { month: 12, day: 31, hour: 12, minute: 25, second: 59, timezone: '+01:00' })

// operator
{
  '$dateFromParts': {
    year: 2000,
    month: 12,
    day: 31,
    hour: 12,
    minute: 25,
    second: 59,
    timezone: '+01:00'
  }
}

$DateFromIsoWeekParts(2000, { isoWeek: 53, isoDayOfWeek: 7, millisecond: 500 })

// operator
{ '$dateFromParts': { isoWeekYear: 2000, isoWeek: 53, isoDayOfWeek: 7, millisecond: 500 } }

$DateFromString

$DateFromString('2017-02-08T12:10:40.787', { timezone: 'America/New_York' })

// operator
{
  '$dateFromString': {
    dateString: '2017-02-08T12:10:40.787',
    timezone: 'America/New_York'
  }
}

$DateSubtract

$DateSubtract(1697382106124, 'month', 1)

// operator
{ '$dateSubtract': { startDate: 1697382106124, unit: 'month', amount: 1 } }

$DateToParts

$DateToParts(1697382106124)

// operator
{ '$dateToParts': { date: 1697382106124 } }

$DateToString

$DateToString(1697382106124)

// operator
{ '$dateToString': { date: 1697382106124 } }

$DateTrunc

$DateTrunc(1697382106124, 'month')

// operator
{ '$dateTrunc': { date: 1697382106124, unit: 'month' } }

$DayOfMonth

$DayOfMonth('$date', 'Europe/Paris')

// operator
{ '$dayOfMonth': { date: '$date', timezone: 'Europe/Paris' } }

$DayOfWeek

$DayOfWeek('$date', '+03:30')

// operator
{ '$dayOfWeek': { date: '$date', timezone: '+03:30' } }

$DayOfYear

$DayOfYear('$date')

// operator
{ '$dayOfYear': { date: '$date' } }

$DegreesToRadians

$DegreesToRadians('$angle_a')

// operator
{ '$degreesToRadians': '$angle_a' }

$DenseRank



// operator

$Derivative



// operator

$Divide



// operator

$DocumentNumber



// operator

$Equal



// operator

$Exponent



// operator

$ExponentialMovingAverage



// operator

$Filter



// operator

$First



// operator

$FirstN



// operator



// operator

$Floor



// operator

$Function



// operator

$GetField



// operator

$GreaterThan



// operator

$GreaterThanEqual



// operator

$Hour



// operator

$IfNull



// operator

$In



// operator

$IndexOfArray



// operator

$IndexOfBytes



// operator

$IndexOfCodePoint



// operator

$Integral



// operator

$IsArray



// operator

$IsNumber



// operator

$IsoDayOfWeek



// operator

$IsoWeek



// operator

$IsoWeekYear



// operator

$Last



// operator

$LastN



// operator



// operator

$LessThan



// operator

$LessThanEqual



// operator

$Let



// operator

$Literal



// operator

$Log



// operator

$Log10



// operator

$Ltrim



// operator

$Map



// operator

$Max



// operator

$MergeObjects



// operator

$Meta



// operator

$Millisecond



// operator

$Min



// operator

$Minute



// operator

$Mod



// operator

$Month



// operator

$Multiply



// operator

$NaturalLog



// operator

$Not



// operator

$NotEqual



// operator

$ObjectToArray



// operator

$Or



// operator

$Pow



// operator

$Push



// operator

$RadiansToDegrees



// operator

$Rand



// operator

$Range



// operator

$Reduce



// operator

$RegexFind



// operator

$RegexFindAll



// operator

$RegexMatch



// operator

$ReplaceAll



// operator

$ReplaceOne



// operator

$ReverseArray



// operator

$Round



// operator

$Rtrim



// operator

$SampleRate



// operator

$Second



// operator

$SetDifference



// operator

$SetEquals



// operator

$SetIntersection



// operator

$SetIsSubset



// operator

$SetUnion



// operator

$Sin



// operator

$Sinh



// operator

$Size



// operator

$Slice



// operator

$Split



// operator

$Sqrt



// operator

$StdDevPop



// operator

$StdDevSamp



// operator

$StrCaseCmp



// operator

$StrLenBytes



// operator

$StrLenCP



// operator

$Substr



// operator

$SubstrBytes



// operator

$SubstrCP



// operator

$Subtract



// operator

$Sum



// operator

$Switch



// operator

$Tan



// operator

$Tanh



// operator

$ToBool



// operator

$ToDate



// operator

$ToDecimal



// operator

$ToDouble



// operator

$ToInt



// operator

$ToLong



// operator

$ToLower



// operator

$ToObjectId



// operator

$ToString



// operator

$ToUpper



// operator

$Trim



// operator

$Trunc



// operator

$Type



// operator

$Week



// operator

$Year



// operator

$Zip



// operator

mongodb-pipeline-builder

npm package

News and Breaking changes between v3 and v4

PipelineBuilder:

Helpers:

Operators:

GetResult:

GetPagingResult:

Usage:

Using require()

Using import

Pagination example

No pagination example

GetResult method (No pagination)

GetElement(index: number | 'last') method possibilities:

GetPagingResult method (Pagination)

CUSTOM STAGES

Paging(elementsPerPage, page)

InsertStage(stage)

AddFields(...values)

Helper: Field(name, value)

Bucket(value)

Helper: BucketHelper(groupBy, boundaries, optional)

BucketAuto(value)

Helper: BucketAutoHelper(groupBy, buckets, optional)

ChangeStream(value)

Helper: ChangeStreamHelper(optional)

ChangeStreamSplitLargeEvent()

CollStats(value)

Helper: CollStatsHelper(optional)

Count(value)

CurrentOp(value)

Helper: CurrentOpHelper(optional)

Densify(value)

Helper: DensifyHelper(field, range, optional)

Documents(...values)

Facet(...values)

Helper: Field(name, pipeline)

Fill(value)

Helper: FillHelper(output, optional)

GeoNear(value)

Helper: GeoNearHelper(near, distanceField, optional)

GraphLookup(value)

Group(value)

IndexStats()

Limit(value)

ListLocalSessions(value)

ListSampledQueries(value)

ListSearchIndexes(value)

ListSessions(value)

Lookup(value)

Helper: LookupConditionHelper(from, as, optional)

Helper: LookupEqualityHelper(from, as, localField, foreignField)

Match(value)

Helper: Field(name, value)

Operator: $Expression

Merge(value)

Helper: MergeHelper(into, optional)

Out(value)

Helper: OutHelper(collection, optional)

PlanCacheStats()

Project(...values)

Helper: ProjectHelper(field, value)

Helper: ProjectIgnoreHelper(...fields)

Helper: ProjectOnlyHelper(...fields)

Redact(value)

ReplaceRoot(value)

ReplaceWith(value)

Sample(value)

Helper: SampleHelper(size)

Search(value)

Helper: SearchHelper(operator | collector, optional)

SearchMeta(value)

Helper: SearchMetaHelper(collector, optional)

Set(...values)

Helper: Field(name, value)

SetWindowFields(value)

ShardedDataDistribution(value)

Skip(value)

Sort(...values)

Using `require()`

Using `import`

`GetElement(index: number | 'last')` method possibilities:

Helper: `Field(name, value)`

Helper: `BucketHelper(groupBy, boundaries, optional)`

Helper: `BucketAutoHelper(groupBy, buckets, optional)`

Helper: `ChangeStreamHelper(optional)`

Helper: `CollStatsHelper(optional)`

Helper: `CurrentOpHelper(optional)`

Helper: `DensifyHelper(field, range, optional)`

Helper: `Field(name, pipeline)`

Helper: `FillHelper(output, optional)`

Helper: `GeoNearHelper(near, distanceField, optional)`

Helper: `LookupConditionHelper(from, as, optional)`

Helper: `LookupEqualityHelper(from, as, localField, foreignField)`

Helper: `Field(name, value)`

Operator: `$Expression`

Helper: `MergeHelper(into, optional)`

Helper: `OutHelper(collection, optional)`

Helper: `ProjectHelper(field, value)`

Helper: `ProjectIgnoreHelper(...fields)`

Helper: `ProjectOnlyHelper(...fields)`

Helper: `SampleHelper(size)`

Helper: `SearchHelper(operator | collector, optional)`

Helper: `SearchMetaHelper(collector, optional)`

Helper: `Field(name, value)`

Helper: `Field(name, value)`

Helper: `UnionWithHelper(collection, pipeline)`