driver-scala 4.8.1 API - org.mongodb.scala.model.Accumulators

final def !=(arg0: Any): Boolean

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final def ##(): Int

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final def ==(arg0: Any): Boolean

Definition Classes: AnyRef → Any

def accumulator(fieldName: String, initFunction: String, initArgs: Seq[String], accumulateFunction: String, accumulateArgs: Seq[String], mergeFunction: String, finalizeFunction: String, lang: String): BsonField

Creates an $accumulator pipeline stage

fieldName: the field name
initFunction: a function used to initialize the state
initArgs: init function’s arguments (may be null)
accumulateFunction: a function used to accumulate documents
accumulateArgs: additional accumulate function’s arguments (may be null). The first argument to the function is ‘state’.
mergeFunction: a function used to merge two internal states, e.g. accumulated on different shards or threads. It returns the resulting state of the accumulator.
finalizeFunction: a function used to finalize the state and return the result (may be null)
lang: a language specifier
returns: the $accumulator pipeline stage

Since: 1.2
Note: Requires MongoDB 4.4 or greater
See also: $accumulator

def accumulator(fieldName: String, initFunction: String, initArgs: Seq[String], accumulateFunction: String, accumulateArgs: Seq[String], mergeFunction: String, finalizeFunction: String): BsonField

Creates an $accumulator pipeline stage

fieldName: the field name
initFunction: a function used to initialize the state
initArgs: init function’s arguments (may be null)
accumulateFunction: a function used to accumulate documents
accumulateArgs: additional accumulate function’s arguments (may be null). The first argument to the function is ‘state’.
mergeFunction: a function used to merge two internal states, e.g. accumulated on different shards or threads. It returns the resulting state of the accumulator.
finalizeFunction: a function used to finalize the state and return the result (may be null)
returns: the $accumulator pipeline stage

Since: 1.2
Note: Requires MongoDB 4.4 or greater
See also: $accumulator

def accumulator(fieldName: String, initFunction: String, accumulateFunction: String, mergeFunction: String, finalizeFunction: String): BsonField

Creates an $accumulator pipeline stage

fieldName: the field name
initFunction: a function used to initialize the state
accumulateFunction: a function used to accumulate documents
mergeFunction: a function used to merge two internal states, e.g. accumulated on different shards or threads. It returns the resulting state of the accumulator.
finalizeFunction: a function used to finalize the state and return the result (may be null)
returns: the $accumulator pipeline stage

Since: 1.2
Note: Requires MongoDB 4.4 or greater
See also: $accumulator

def accumulator(fieldName: String, initFunction: String, accumulateFunction: String, mergeFunction: String): BsonField

Creates an $accumulator pipeline stage

fieldName: the field name
initFunction: a function used to initialize the state
accumulateFunction: a function used to accumulate documents
mergeFunction: a function used to merge two internal states, e.g. accumulated on different shards or threads. It returns the resulting state of the accumulator.
returns: the $accumulator pipeline stage

Since: 1.2
Note: Requires MongoDB 4.4 or greater
See also: $accumulator

def addToSet[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing all unique values that results from applying the given expression to each document in a group of documents that share the same group by key.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

See also: $addToSet

final def asInstanceOf[T0]: T0

Definition Classes: Any

def avg[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing the average of the values of the given expression when applied to all members of the group.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

See also: $avg

def bottom[OutExpression](fieldName: String, sortBy: Bson, outExpression: OutExpression): BsonField

Returns a combination of a computed field and an accumulator that produces a value of the given outExpression computed for the bottom element within a group sorted according to the provided sort specification.

OutExpression: The type of the output expression.
fieldName: The field computed by the accumulator.
sortBy: The sort specification. The syntax is identical to the one expected by Aggregates.sort.
outExpression: The output expression.
returns: The requested BsonField.

Since: 4.7
Note: Requires MongoDB 5.2 or greater
See also: $bottom

def bottomN[OutExpression, NExpression](fieldName: String, sortBy: Bson, outExpression: OutExpression, nExpression: NExpression): BsonField

Returns a combination of a computed field and an accumulator that produces a BSON Array of values of the given outExpression computed for the bottom N elements within a group sorted according to the provided sort specification, where N is the positive integral value of the nExpression.

OutExpression: The type of the output expression.
NExpression: The type of the limiting expression.
fieldName: The field computed by the accumulator.
sortBy: The sort specification. The syntax is identical to the one expected by Aggregates.sort.
outExpression: The output expression.
nExpression: The expression limiting the number of produced values.
returns: The requested BsonField.

Since: 4.7
Note: Requires MongoDB 5.2 or greater
See also: $bottomN

def clone(): AnyRef

Attributes: protected[lang]
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final def eq(arg0: AnyRef): Boolean

Definition Classes: AnyRef

def equals(arg0: Any): Boolean

Definition Classes: AnyRef → Any

def first[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing the value of the given expression when applied to the first member of the group.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

See also: $first

def firstN[InExpression, NExpression](fieldName: String, inExpression: InExpression, nExpression: NExpression): BsonField

Returns a combination of a computed field and an accumulator that produces a BSON Array of values of the given inExpression computed for the first N elements within a presorted group, where N is the positive integral value of the nExpression.

InExpression: The type of the input expression.
NExpression: The type of the limiting expression.
fieldName: The field computed by the accumulator.
inExpression: The input expression.
nExpression: The expression limiting the number of produced values.
returns: The requested BsonField.

Since: 4.7
Note: Requires MongoDB 5.2 or greater
See also: $firstN

final def getClass(): Class[_]

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def hashCode(): Int

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final def isInstanceOf[T0]: Boolean

Definition Classes: Any

def last[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing the value of the given expression when applied to the last member of the group.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

See also: $last

def lastN[InExpression, NExpression](fieldName: String, inExpression: InExpression, nExpression: NExpression): BsonField

Returns a combination of a computed field and an accumulator that produces a BSON Array of values of the given inExpression computed for the last N elements within a presorted group where N is the positive integral value of the nExpression.

InExpression: The type of the input expression.
NExpression: The type of the limiting expression.
fieldName: The field computed by the accumulator.
inExpression: The input expression.
nExpression: The expression limiting the number of produced values.
returns: The requested BsonField.

Since: 4.7
Note: Requires MongoDB 5.2 or greater
See also: $lastN

def max[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing the maximum of the values of the given expression when applied to all members of the group.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

See also: $max

def maxN[InExpression, NExpression](fieldName: String, inExpression: InExpression, nExpression: NExpression): BsonField

Returns a combination of a computed field and an accumulator that produces a BSON Array of N largest values of the given inExpression, where N is the positive integral value of the nExpression.

InExpression: The type of the input expression.
NExpression: The type of the limiting expression.
fieldName: The field computed by the accumulator.
inExpression: The input expression.
nExpression: The expression limiting the number of produced values.
returns: The requested BsonField.

Since: 4.7
Note: Requires MongoDB 5.2 or greater
See also: $maxN

def mergeObjects[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing the result of merging the fields of the documents.

Gets a field name for a $group operation representing the result of merging the fields of the documents. If documents to merge include the same field name, the field, in the resulting document, has the value from the last document merged for the field.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

Since: 4.4
See also: $mergeObjects

def min[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing the minimum of the values of the given expression when applied to all members of the group.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

See also: $min

def minN[InExpression, NExpression](fieldName: String, inExpression: InExpression, nExpression: NExpression): BsonField

Returns a combination of a computed field and an accumulator that produces a BSON Array of N smallest values of the given inExpression, where N is the positive integral value of the nExpression.

InExpression: The type of the input expression.
NExpression: The type of the limiting expression.
fieldName: The field computed by the accumulator.
inExpression: The input expression.
nExpression: The expression limiting the number of produced values.
returns: The requested BsonField.

Since: 4.7
Note: Requires MongoDB 5.2 or greater
See also: $minN

final def ne(arg0: AnyRef): Boolean

Definition Classes: AnyRef

final def notify(): Unit

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final def notifyAll(): Unit

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def push[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing an array of all values that results from applying an expression to each document in a group of documents that share the same group by key.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

See also: $push

def stdDevPop[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.

Use if the values encompass the entire population of data you want to represent and do not wish to generalize about a larger population.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

Since: 1.1
Note: Requires MongoDB 3.2 or greater
See also: $stdDevPop

def stdDevSamp[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing the sample standard deviation of the values of the given expression when applied to all members of the group.

Use if the values encompass a sample of a population of data from which to generalize about the population.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

Since: 1.1
Note: Requires MongoDB 3.2 or greater
See also: $stdDevSamp

def sum[TExpression](fieldName: String, expression: TExpression): BsonField

Gets a field name for a $group operation representing the sum of the values of the given expression when applied to all members of the group.

TExpression: the expression type
fieldName: the field name
expression: the expression
returns: the field

See also: $sum

final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes: AnyRef

def toString(): String

Definition Classes: AnyRef → Any

def top[OutExpression](fieldName: String, sortBy: Bson, outExpression: OutExpression): BsonField

Returns a combination of a computed field and an accumulator that produces a value of the given outExpression computed for the top element within a group sorted according to the provided sort specification.

OutExpression: The type of the output expression.
fieldName: The field computed by the accumulator.
sortBy: The sort specification. The syntax is identical to the one expected by Aggregates.sort.
outExpression: The output expression.
returns: The requested BsonField.

Since: 4.7
Note: Requires MongoDB 5.2 or greater
See also: $topN

def topN[OutExpression, NExpression](fieldName: String, sortBy: Bson, outExpression: OutExpression, nExpression: NExpression): BsonField

Returns a combination of a computed field and an accumulator that produces a BSON Array of values of the given outExpression computed for the top N elements within a group sorted according to the provided sort specification, where N is the positive integral value of the nExpression.

OutExpression: The type of the output expression.
NExpression: The type of the limiting expression.
fieldName: The field computed by the accumulator.
sortBy: The sort specification. The syntax is identical to the one expected by Aggregates.sort.
outExpression: The output expression.
nExpression: The expression limiting the number of produced values.
returns: The requested BsonField.

Since: 4.7
Note: Requires MongoDB 5.2 or greater
See also: $topN

final def wait(arg0: Long, arg1: Int): Unit

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final def wait(arg0: Long): Unit

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final def wait(): Unit

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Packages

Accumulators

object Accumulators

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Packages

Accumulators 

object Accumulators

Value Members

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Accumulators