33 lines
1.0 KiB
JavaScript
33 lines
1.0 KiB
JavaScript
// SERVER-533: Aggregation stage to randomly sample documents.
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// For assertErrorCode.
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load('jstests/aggregation/extras/utils.js');
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(function() {
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'use strict';
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var coll = db.agg_sample;
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coll.drop();
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var nItems = 3;
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for (var i = 0; i < nItems; i++) {
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assert.writeOK(coll.insert({_id: i}));
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}
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[0, 1, nItems, nItems + 1].forEach(function(size) {
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var results = coll.aggregate([{$sample: {size: size}}]).toArray();
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assert.eq(results.length, Math.min(size, nItems));
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});
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// Multiple $sample stages are allowed.
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var results = coll.aggregate([{$sample: {size: nItems}}, {$sample: {size: 1}}]).toArray();
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assert.eq(results.length, 1);
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// Invalid options.
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assertErrorCode(coll, [{$sample: 'string'}], 28745);
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assertErrorCode(coll, [{$sample: {size: 'string'}}], 28746);
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assertErrorCode(coll, [{$sample: {size: -1}}], 28747);
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assertErrorCode(coll, [{$sample: {unknownOpt: true}}], 28748);
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assertErrorCode(coll, [{$sample: {/* no size */}}], 28749);
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}());
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