061a086641
The actual change is in src/mongo/shell/collection.js with the remaining changes
to adjust tests to the new api.
The "ideal" arguments are now an array of pipeline ops and an optional object
with extra top-level options for the command (such as {explain: true}. For
backwards compatibility, we still support the varargs style where each argument
is a pipeline stage, but there is no way to specify extra parameters in this
mode.
84 lines
3.2 KiB
JavaScript
84 lines
3.2 KiB
JavaScript
// SERVER-9840 variables in expressions and $let
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load('jstests/aggregation/extras/utils.js');
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var t = db.server9840;
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t.drop();
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function test(expression, expected) {
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t.drop();
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t.insert({zero:0, one:1, two:2, three:3, nested: {four: 4}});
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// Test in projection:
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var result = t.aggregate({$project:{_id:0, res: expression}}).toArray();
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assert.eq(result, [{res:expected}]);
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// Test in group:
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var result = t.aggregate({$group:{_id: 0, res: {$sum: expression}}}).toArray();
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assert.eq(result, [{_id: 0, res:expected}]);
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}
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// basics
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test('$two', 2);
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test('$$CURRENT.two', 2);
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test('$$ROOT.two', 2);
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// using sub expressions
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test({$add: ['$two', '$$CURRENT.three']}, 5);
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test({$add: ['$$CURRENT.two', '$$ROOT.nested.four']}, 6);
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// $let simple
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test({$let: {vars: {a: 10}, in: '$$a'}}, 10);
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test({$let: {vars: {a: '$zero'}, in: '$$a'}}, 0);
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test({$let: {vars: {a: {$add:['$one', '$two']},
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b: 10},
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in: {$multiply:['$$a', '$$b']}}},
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30);
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// $let changing CURRENT
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test({$let: {vars: {CURRENT: '$$ROOT.nested'},
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in: {$multiply:['$four', '$$ROOT.two']}}},
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8);
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test({$let: {vars: {CURRENT: '$$CURRENT.nested'}, // using original value of CURRENT
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in: {$multiply:['$four', '$$ROOT.two']}}},
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8);
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test({$let: {vars: {CURRENT: '$nested'}, // same as last
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in: {$multiply:['$four', '$$ROOT.two']}}},
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8);
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test({$let: {vars: {CURRENT: {$const:{ten: 10}}}, // "artificial" object
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in: {$multiply:['$ten', '$$ROOT.two']}}},
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20);
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test({$let: {vars: {CURRENT: '$three'}, // sets current to the number 3 (not an object)
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in: {$multiply:['$$CURRENT', '$$ROOT.two']}}},
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6);
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// swapping with $let (ensures there is no ordering dependency in vars)
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test({$let: {vars: {x: 6, y: 10},
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in: {$let: {vars: {x: '$$y', y: '$$x'}, // now {x:10, y:6}
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in: {$subtract: ['$$x', '$$y']}}}}}, // not commutative!
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4); // 10-6 not 6-10 or 6-6
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// unicode is allowed
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test({$let: {vars: {'日本語': 10}, in: '$$日本語'}}, 10) // Japanese for "Japanese language"
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// Can use ROOT and CURRENT directly with no subfield (SERVER-5916)
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t.drop();
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t.insert({_id: 'obj'});
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assert.eq(t.aggregate({$project: {_id:0, obj: '$$ROOT'}}).toArray(),
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[{obj: {_id: 'obj'}}]);
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assert.eq(t.aggregate({$project: {_id:0, obj: '$$CURRENT'}}).toArray(),
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[{obj: {_id: 'obj'}}]);
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assert.eq(t.aggregate({$group: {_id:0, objs: {$push: '$$ROOT'}}}).toArray(),
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[{_id: 0, objs: [{_id: 'obj'}]}]);
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assert.eq(t.aggregate({$group: {_id:0, objs: {$push: '$$CURRENT'}}}).toArray(),
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[{_id: 0, objs: [{_id: 'obj'}]}]);
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// check name validity checks
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assertErrorCode(t, {$project: {a: {$let:{vars: {ROOT: 1}, in: '$$ROOT'}}}}, 16867);
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assertErrorCode(t, {$project: {a: {$let:{vars: {FOO: 1}, in: '$$FOO'}}}}, 16867);
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assertErrorCode(t, {$project: {a: {$let:{vars: {_underbar: 1}, in: '$$FOO'}}}}, 16867);
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assertErrorCode(t, {$project: {a: {$let:{vars: {'a.b': 1}, in: '$$FOO'}}}}, 16868);
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assertErrorCode(t, {$project: {a: {$let:{vars: {'a b': 1}, in: '$$FOO'}}}}, 16868);
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assertErrorCode(t, {$project: {a: '$$_underbar'}}, 16870);
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assertErrorCode(t, {$project: {a: '$$with spaces'}}, 16871);
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