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PHPLIB-1359 Add tests on Accumulators ($group, $bucket, $bucketAuto, $setWindowFields) (#29)
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‎generator/config/accumulator/avg.yaml

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@@ -13,3 +13,33 @@ arguments:
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name: expression
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type:
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- resolvesToNumber
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tests:
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-
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name: 'Use in $group Stage'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/avg/#use-in--group-stage'
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pipeline:
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- $group:
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_id: '$item'
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avgAmount:
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$avg:
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$multiply:
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- '$price'
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- '$quantity'
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avgQuantity:
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$avg: '$quantity'
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-
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name: 'Use in $setWindowFields Stage'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/avg/#use-in--setwindowfields-stage'
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pipeline:
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-
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$setWindowFields:
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partitionBy: '$state'
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sortBy:
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orderDate: 1
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output:
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averageQuantityForState:
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$avg: '$quantity'
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window:
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documents:
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- 'unbounded'
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- 'current'

‎generator/config/accumulator/bottom.yaml

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@@ -21,3 +21,35 @@ arguments:
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- expression
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description: |
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Represents the output for each element in the group and can be any expression.
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tests:
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-
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name: 'Find the Bottom Score'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/bottom/#find-the-bottom-score'
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pipeline:
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-
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$match:
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gameId: 'G1'
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-
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$group:
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_id: '$gameId'
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playerId:
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$bottom:
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output:
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- '$playerId'
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- '$score'
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sortBy:
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score: -1
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-
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name: 'Finding the Bottom Score Across Multiple Games'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/bottom/#finding-the-bottom-score-across-multiple-games'
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pipeline:
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-
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$group:
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_id: '$gameId'
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playerId:
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$bottom:
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output:
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- '$playerId'
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- '$score'
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sortBy:
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score: -1

‎generator/config/accumulator/bottomN.yaml

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- expression
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description: |
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Represents the output for each element in the group and can be any expression.
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tests:
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-
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name: 'Find the Three Lowest Scores'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/bottomN/#find-the-three-lowest-scores'
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pipeline:
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-
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$match:
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gameId: 'G1'
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-
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$group:
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_id: '$gameId'
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playerId:
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$bottomN:
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output:
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- '$playerId'
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- '$score'
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sortBy:
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score: -1
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n: 3
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-
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name: 'Finding the Three Lowest Score Documents Across Multiple Games'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/bottomN/#finding-the-three-lowest-score-documents-across-multiple-games'
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pipeline:
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-
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$group:
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_id: '$gameId'
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playerId:
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$bottomN:
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output:
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- '$playerId'
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- '$score'
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sortBy:
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score: -1
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n: 3
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-
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name: 'Computing n Based on the Group Key for $group'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/bottomN/#computing-n-based-on-the-group-key-for--group'
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pipeline:
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-
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$group:
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_id:
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gameId: '$gameId'
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gamescores:
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$bottomN:
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output: '$score'
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n:
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$cond:
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if:
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$eq:
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- '$gameId'
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- 'G2'
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then: 1
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else: 3
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sortBy:
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score: -1

‎generator/config/accumulator/count.yaml

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@@ -9,3 +9,29 @@ description: |
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Returns the number of documents in the group or window.
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Distinct from the $count pipeline stage.
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New in MongoDB 5.0.
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tests:
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-
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name: 'Use in $group Stage'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/count-accumulator/#use-in--group-stage'
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pipeline:
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-
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$group:
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_id: '$state'
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countNumberOfDocumentsForState:
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$count: {}
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-
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name: 'Use in $setWindowFields Stage'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/count-accumulator/#use-in--setwindowfields-stage'
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pipeline:
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-
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$setWindowFields:
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partitionBy: '$state'
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sortBy:
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orderDate: 1
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output:
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countNumberOfDocumentsForState:
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$count: {}
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window:
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documents:
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- 'unbounded'
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- 'current'

‎generator/config/accumulator/firstN.yaml

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$firstN:
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input: '$score'
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n: 5
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-
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name: 'Find the First Three Player Scores for a Single Game'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/firstN/#find-the-first-three-player-scores-for-a-single-game'
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pipeline:
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-
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$match:
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gameId: 'G1'
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-
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$group:
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_id: '$gameId'
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firstThreeScores:
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$firstN:
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input:
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- '$playerId'
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- '$score'
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n: 3
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-
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name: 'Finding the First Three Player Scores Across Multiple Games'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/firstN/#finding-the-first-three-player-scores-across-multiple-games'
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pipeline:
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-
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$group:
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_id: '$gameId'
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playerId:
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$firstN:
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input:
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- '$playerId'
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- '$score'
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n: 3
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-
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name: 'Using $sort With $firstN'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/firstN/#using--sort-with--firstn'
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pipeline:
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-
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$sort:
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score: -1
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-
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$group:
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_id: '$gameId'
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playerId:
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$firstN:
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input:
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- '$playerId'
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- '$score'
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n: 3
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-
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name: 'Computing n Based on the Group Key for $group'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/firstN/#computing-n-based-on-the-group-key-for--group'
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pipeline:
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-
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$group:
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_id:
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gameId: '$gameId'
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gamescores:
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$firstN:
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input: '$score'
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n:
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$cond:
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if:
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$eq:
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- '$gameId'
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- 'G2'
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then: 1
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else: 3
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‎generator/config/accumulator/max.yaml

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name: expression
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type:
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- expression
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tests:
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-
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name: 'Use in $group Stage'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/max/#use-in--group-stage'
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pipeline:
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-
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$group:
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_id: '$item'
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maxTotalAmount:
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$max:
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$multiply:
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- '$price'
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- '$quantity'
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maxQuantity:
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$max: '$quantity'
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-
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name: 'Use in $setWindowFields Stage'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/max/#use-in--setwindowfields-stage'
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pipeline:
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-
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$setWindowFields:
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partitionBy: '$state'
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sortBy:
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orderDate: 1
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output:
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maximumQuantityForState:
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$max: '$quantity'
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window:
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documents:
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- 'unbounded'
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- 'current'

‎generator/config/accumulator/maxN.yaml

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- resolvesToInt
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description: |
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An expression that resolves to a positive integer. The integer specifies the number of array elements that $maxN returns.
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tests:
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-
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name: 'Find the Maximum Three Scores for a Single Game'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/maxN/#find-the-maximum-three-scores-for-a-single-game'
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pipeline:
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-
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$match:
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gameId: 'G1'
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-
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$group:
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_id: '$gameId'
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maxThreeScores:
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$maxN:
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input:
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- '$score'
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- '$playerId'
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n: 3
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-
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name: 'Finding the Maximum Three Scores Across Multiple Games'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/maxN/#finding-the-maximum-three-scores-across-multiple-games'
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pipeline:
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-
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$group:
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_id: '$gameId'
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maxScores:
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$maxN:
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input:
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- '$score'
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- '$playerId'
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n: 3
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-
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name: 'Computing n Based on the Group Key for $group'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/maxN/#computing-n-based-on-the-group-key-for--group'
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pipeline:
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-
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$group:
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_id:
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gameId: '$gameId'
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gamescores:
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$maxN:
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input:
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- '$score'
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- '$playerId'
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n:
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$cond:
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if:
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$eq:
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- '$gameId'
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- 'G2'
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then: 1
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else: 3

‎generator/config/accumulator/median.yaml

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- string # AccumulatorPercentile
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description: |
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The method that mongod uses to calculate the 50th percentile value. The method must be 'approximate'.
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tests:
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-
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name: 'Use $median as an Accumulator'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/median/#use-operatorname-as-an-accumulator'
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pipeline:
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-
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$group:
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_id: ~
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test01_median:
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$median:
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input: '$test01'
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method: 'approximate'
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-
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name: 'Use $median in a $setWindowField Stage'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/median/#use-operatorname-in-a--setwindowfield-stage'
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pipeline:
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-
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$setWindowFields:
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sortBy:
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test01: 1
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output:
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test01_median:
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$median:
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input: '$test01'
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method: 'approximate'
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window:
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range:
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- -3
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- 3
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-
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$project:
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_id: 0
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studentId: 1
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test01_median: 1

‎generator/config/accumulator/mergeObjects.yaml

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name: document
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type:
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- resolvesToObject
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variadic: array
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description: |
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Any valid expression that resolves to a document.
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tests:
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-
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name: '$mergeObjects as an Accumulator'
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link: 'https://www.mongodb.com/docs/manual/reference/operator/aggregation/mergeObjects/#-mergeobjects-as-an-accumulator'
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pipeline:
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-
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$group:
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_id: '$item'
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mergedSales:
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$mergeObjects: '$quantity'

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