mirror of https://github.com/mongodb/mongo
49 lines
1.7 KiB
JavaScript
49 lines
1.7 KiB
JavaScript
// SERVER-9841 $map expression to map over arrays
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(function() {
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"use strict";
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load('jstests/aggregation/extras/utils.js');
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var t = db.server9841;
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t.drop();
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t.insert({
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simple: [1, 2, 3, 4],
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nested: [{a: 1}, {a: 2}],
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mixed: [{a: 1}, {}, {a: 2}, {a: null}],
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notArray: 1,
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null: null,
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});
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function test(expression, expected) {
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var result = t.aggregate({$project: {_id: 0, res: expression}}).toArray();
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assert.eq(result, [{res: expected}]);
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}
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test({$map: {input: "$simple", as: "var", in : '$$var'}}, [1, 2, 3, 4]);
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test({$map: {input: "$simple", as: "var", in : {$add: [10, '$$var']}}}, [11, 12, 13, 14]);
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test({$map: {input: "$simple", in : '$$this'}}, [1, 2, 3, 4]);
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test({$map: {input: "$nested", as: "var", in : '$$var.a'}}, [1, 2]);
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test({$map: {input: "$nested", as: "CURRENT", in : '$a'}}, [1, 2]);
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test({$map: {input: "$mixed", as: "var", in : '$$var.a'}},
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[1, null, 2, null]); // missing becomes null
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test({$map: {input: "$null", as: "var", in : '$$var'}}, null);
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// can't set ROOT
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assertErrorCode(t,
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{$project: {a: {$map: {input: "$simple", as: "ROOT", in : '$$ROOT'}}}},
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ErrorCodes.FailedToParse);
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// error on non-array
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assertErrorCode(t, {$project: {a: {$map: {input: "$notArray", as: "var", in : '$$var'}}}}, 16883);
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// parse errors (missing or extra fields)
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assertErrorCode(
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t, {$project: {a: {$map: {x: 1, input: "$simple", as: "var", in : '$$var'}}}}, 16879);
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assertErrorCode(t, {$project: {a: {$map: {as: "var", in : '$$var'}}}}, 16880);
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assertErrorCode(t, {$project: {a: {$map: {input: "$simple", as: "var"}}}}, 16882);
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// 'in' uses undefined variable name.
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assertErrorCode(t, {$project: {a: {$map: {input: "$simple", in : '$$var'}}}}, 17276);
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}());
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