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support $mergeObjects #794

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16 changes: 16 additions & 0 deletions driver-core/src/main/com/mongodb/client/model/Accumulators.java
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Original file line number Diff line number Diff line change
Expand Up @@ -148,6 +148,22 @@ public static <TExpression> BsonField addToSet(final String fieldName, final TEx
return accumulatorOperator("$addToSet", fieldName, expression);
}


/**
* 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.
*
* @param fieldName the field name
* @param expression the expression
* @param <TExpression> the expression type
* @return the field
* @mongodb.driver.manual reference/operator/aggregation/mergeObjects/ $mergeObjects
*/
public static <TExpression> BsonField mergeObjects(final String fieldName, final TExpression expression) {
return accumulatorOperator("$mergeObjects", fieldName, expression);
}

/**
* 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.
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7 changes: 7 additions & 0 deletions ...ore/src/test/functional/com/mongodb/client/model/AggregatesFunctionalSpecification.groovy
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Expand Up @@ -37,6 +37,7 @@ import static com.mongodb.client.model.Accumulators.avg
import static com.mongodb.client.model.Accumulators.first
import static com.mongodb.client.model.Accumulators.last
import static com.mongodb.client.model.Accumulators.max
import static com.mongodb.client.model.Accumulators.mergeObjects
import static com.mongodb.client.model.Accumulators.min
import static com.mongodb.client.model.Accumulators.push
import static com.mongodb.client.model.Accumulators.stdDevPop
Expand Down Expand Up @@ -91,16 +92,19 @@ class AggregatesFunctionalSpecification extends OperationFunctionalSpecification
.append('z', false)
.append('a', [1, 2, 3])
.append('a1', [new Document('c', 1).append('d', 2), new Document('c', 2).append('d', 3)])
.append('o', new Document('a', 1))

def b = new Document('_id', 2).append('x', 2)
.append('y', 'b')
.append('z', true)
.append('a', [3, 4, 5, 6])
.append('a1', [new Document('c', 2).append('d', 3), new Document('c', 3).append('d', 4)])
.append('o', new Document('b', 2))

def c = new Document('_id', 3).append('x', 3)
.append('y', 'c')
.append('z', true)
.append('o', new Document('c', 3))

def setup() {
getCollectionHelper().insertDocuments(a, b, c)
Expand Down Expand Up @@ -203,6 +207,9 @@ class AggregatesFunctionalSpecification extends OperationFunctionalSpecification

aggregate([group('$z', addToSet('acc', '$z'))]).containsAll([new Document('_id', true).append('acc', [true]),
new Document('_id', false).append('acc', [false])])

aggregate([group(null, mergeObjects('acc', '$o'))]).containsAll(
[new Document('_id', null).append('acc',new Document('a', 1).append('b', 2).append('c', 3))])
}

def '$out'() {
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7 changes: 7 additions & 0 deletions driver-core/src/test/unit/com/mongodb/client/model/AggregatesSpecification.groovy
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Expand Up @@ -33,6 +33,7 @@ import static com.mongodb.client.model.Accumulators.avg
import static com.mongodb.client.model.Accumulators.first
import static com.mongodb.client.model.Accumulators.last
import static com.mongodb.client.model.Accumulators.max
import static com.mongodb.client.model.Accumulators.mergeObjects
import static com.mongodb.client.model.Accumulators.min
import static com.mongodb.client.model.Accumulators.push
import static com.mongodb.client.model.Accumulators.stdDevPop
Expand Down Expand Up @@ -439,6 +440,7 @@ class AggregatesSpecification extends Specification {
first: { $first: "$quantity" },
last: { $last: "$quantity" },
all: { $push: "$quantity" },
merged: { $mergeObjects: "$quantity" },
unique: { $addToSet: "$quantity" },
stdDevPop: { $stdDevPop: "$quantity" },
stdDevSamp: { $stdDevSamp: "$quantity" }
Expand All @@ -452,6 +454,7 @@ class AggregatesSpecification extends Specification {
first('first', '$quantity'),
last('last', '$quantity'),
push('all', '$quantity'),
mergeObjects('merged', '$quantity'),
addToSet('unique', '$quantity'),
stdDevPop('stdDevPop', '$quantity'),
stdDevSamp('stdDevSamp', '$quantity')
Expand Down Expand Up @@ -730,6 +733,7 @@ class AggregatesSpecification extends Specification {
first('first', '$quantity'),
last('last', '$quantity'),
push('all', '$quantity'),
mergeObjects('merged', '$quantity'),
addToSet('unique', '$quantity'),
stdDevPop('stdDevPop', '$quantity'),
stdDevSamp('stdDevSamp', '$quantity')
Expand All @@ -741,6 +745,7 @@ class AggregatesSpecification extends Specification {
first('first', '$quantity'),
last('last', '$quantity'),
push('all', '$quantity'),
mergeObjects('merged', '$quantity'),
addToSet('unique', '$quantity'),
stdDevPop('stdDevPop', '$quantity'),
stdDevSamp('stdDevSamp', '$quantity')
Expand All @@ -763,6 +768,7 @@ class AggregatesSpecification extends Specification {
first('first', '$quantity'),
last('last', '$quantity'),
push('all', '$quantity'),
mergeObjects('merged', '$quantity'),
addToSet('unique', '$quantity'),
stdDevPop('stdDevPop', '$quantity'),
stdDevSamp('stdDevSamp', '$quantity')
Expand All @@ -775,6 +781,7 @@ class AggregatesSpecification extends Specification {
first('first', '$quantity'),
last('last', '$quantity'),
push('all', '$quantity'),
mergeObjects('merged', '$quantity'),
addToSet('unique', '$quantity'),
stdDevPop('stdDevPop', '$quantity'),
stdDevSamp('stdDevSamp', '$quantity')).hashCode()
Expand Down