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// Tests the behavior of $not when used in agg expressions.
(function() {
"use strict";
const coll = db.not_expr;
coll.drop();
// Testing behavior for basic cases.
assert.commandWorked(coll.insert([
{_id: 0, x: 0},
{_id: 1, x: 2},
{_id: 2, x: false},
{_id: 3, x: true},
{_id: 4, x: null},
{_id: 5, x: []}, // Empty array truthy, $not(x) should be false.
{_id: 6, x: [false]}, // $not(x) should be false.
{_id: 7, x: [true]}, // $not(x) should be false.
{_id: 8, x: "hello"},
{_id: 9, x: ObjectId("5f0627282a63fc000b8fd067")},
{_id: 10, x: ISODate("2021-01-01T00:00:00Z")},
{_id: 11, x: {y: 2, z: 3}},
{_id: 12} // Missing field is falsy, so $not is true.
]));
let results = coll.aggregate([{$project: {x: {$not: "$x"}}}, {$sort: {_id: 1}}]).toArray();
assert.eq(results, [
{_id: 0, x: true},
{_id: 1, x: false},
{_id: 2, x: true},
{_id: 3, x: false},
{_id: 4, x: true},
{_id: 5, x: false},
{_id: 6, x: false},
{_id: 7, x: false},
{_id: 8, x: false},
{_id: 9, x: false},
{_id: 10, x: false},
{_id: 11, x: false},
{_id: 12, x: true}
]);
// Testing behavior for array of documents.
assert(coll.drop());
assert.commandWorked(coll.insert([
{_id: 0, x: [{y: 0}, {y: 1}]}, // x.y exists, so false.
{_id: 1, x: [{z: 0}, {z: 1}]}, // x.y evaluates to [] which is truthy, so false.
{_id: 2, x: [false]} // x.y evaluates to [] which is truthy, so false
]));
results = coll.aggregate([{$project: {x: {$not: "$x.y"}}}, {$sort: {_id: 1}}]).toArray();
assert.eq(results, [
{_id: 0, x: false},
{_id: 1, x: false},
{_id: 2, x: false},
]);
// Testing behavior for nested documents.
assert(coll.drop());
assert.commandWorked(coll.insert([
{_id: 0, x: {y: 0}},
{_id: 1, x: {y: 2}},
{_id: 2, x: {y: false}},
{_id: 3, x: {y: true}},
{_id: 4, x: {y: null}},
{_id: 5, x: {y: []}}, // $not(x.y) should be false.
{_id: 6, x: {y: [false]}}, // $not(x.y) should be false.
{_id: 7, x: {y: [true]}} // $not(x.y) should be false.
]));
results = coll.aggregate([{$project: {x: {$not: "$x.y"}}}, {$sort: {_id: 1}}]).toArray();
assert.eq(results, [
{_id: 0, x: true},
{_id: 1, x: false},
{_id: 2, x: true},
{_id: 3, x: false},
{_id: 4, x: true},
{_id: 5, x: false},
{_id: 6, x: false},
{_id: 7, x: false},
]);
// Testing behavior for other cases - nested $not, $and and $or & complex expressions.
assert(coll.drop());
assert.commandWorked(coll.insert([
{_id: 0, x: true, y: false},
{_id: 1, x: false, y: true},
]));
results = coll.aggregate([{$project: {x: {$not: {$not: "$x"}}}}, {$sort: {_id: 1}}]).toArray();
assert.eq(results, [
{_id: 0, x: true},
{_id: 1, x: false},
]);
results =
coll.aggregate([{$project: {x: {$not: {$not: {$not: "$x"}}}}}, {$sort: {_id: 1}}]).toArray();
assert.eq(results, [
{_id: 0, x: false},
{_id: 1, x: true},
]);
results =
coll.aggregate([{$project: {x: {$not: {$and: ["$x", "$y"]}}}}, {$sort: {_id: 1}}]).toArray();
assert.eq(results, [
{_id: 0, x: true},
{_id: 1, x: true},
]);
results =
coll.aggregate([{$project: {x: {$not: {$or: ["$x", "$y"]}}}}, {$sort: {_id: 1}}]).toArray();
assert.eq(results, [
{_id: 0, x: false},
{_id: 1, x: false},
]);
results =
coll.aggregate([{$project: {x: {$and: [{$not: "$x"}, "$y"]}}}, {$sort: {_id: 1}}]).toArray();
assert.eq(results, [
{_id: 0, x: false},
{_id: 1, x: true},
]);
results =
coll.aggregate([{$project: {x: {$or: [{$not: "$x"}, "$y"]}}}, {$sort: {_id: 1}}]).toArray();
assert.eq(results, [
{_id: 0, x: false},
{_id: 1, x: true},
]);
results = coll.aggregate([
{
$project: {
x: {
$switch: {
branches: [
{case: {$not: {$gt: ["$x", "$y"]}}, then: "x"},
{case: {$not: {$lte: ["$x", "$y"]}}, then: "y"}
]
}
}
}
},
{$sort: {_id: 1}}
])
.toArray();
assert.eq(results, [
{_id: 0, x: "y"},
{_id: 1, x: "x"},
]);
}());
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