27 lines
1.1 KiB
JavaScript
27 lines
1.1 KiB
JavaScript
/**
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* Tests that $setWindowFields will overwrite existing fields in the output document if there are
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* conflicts. This test was designed to confirm a behavior change from SERVER-63079.
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* @tags: [
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* # $documents is not supported inside a $facet.
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* do_not_wrap_aggregations_in_facets,
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* ]
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*/
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assert.commandWorked(db[jsTestName()].insert({dummy: 1}));
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let windowResults = db.aggregate([
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{$documents: [{_id: 0, obj: {k1: "v1", k2: "v2"}}]},
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{$setWindowFields: {sortBy: {_id: 1}, output: {obj: {$last: {newSubObject: 1}}}}},
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]);
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// The 'newSubObject' should overwrite the existing 'k1' and 'k2' object.
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assert.eq(windowResults.toArray(), [{_id: 0, obj: {newSubObject: 1}}]);
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// Test that we can preserve the other fields by using a dotted notation and having the window
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// function result in the target value (1 here) instead of an object literal.
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windowResults = db.aggregate([
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{$documents: [{_id: 0, obj: {k1: "v1", k2: "v2"}}]},
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{$setWindowFields: {sortBy: {_id: 1}, output: {"obj.subPath": {$last: 1}}}},
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]);
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assert.eq(windowResults.toArray(), [{_id: 0, obj: {k1: "v1", k2: "v2", subPath: 1}}]);
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