25 lines
1.2 KiB
JavaScript
25 lines
1.2 KiB
JavaScript
/*
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* SERVER-6127 : $project uasserts if an expected nested field has a non object parent in a
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* document.
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*
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* This test validates the SERVER-6127 ticket. Return undefined when retrieving a field along a
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* path, when the subpath does not exist (this is what happens when a field does not exist and there
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* is no path). Previous it would uassert causing the aggregation to end.
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*/
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const coll = db[jsTestName()];
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coll.drop();
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assert.commandWorked(coll.insert({_id: 0, a: 1}));
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assert.commandWorked(coll.insert({_id: 1, foo: 2}));
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assert.commandWorked(coll.insert({_id: 2, foo: {bar: 3}}));
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// Aggregate checking the field foo and the path foo.bar.
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const cursor = coll.aggregate([{$sort: {_id: 1}}, {$project: {_id: 0, "foo.bar": 1, field: "$foo", path: "$foo.bar"}}]);
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// The first document should contain nothing as neither field exists, the second document should
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// contain only field as it has a value in foo, but foo does not have a field bar so it cannot
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// walk that path, the third document should have both the field and path as foo is an object
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// which has a field bar.
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const expected = [{}, {field: 2}, {foo: {bar: 3}, field: {bar: 3}, path: 3}];
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assert.eq(cursor.toArray(), expected);
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