26 lines
966 B
JavaScript
26 lines
966 B
JavaScript
// Basic integration tests for $replaceRoot and its alias $replaceWith.
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(function() {
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"use strict";
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const coll = db.replaceWith_use_cases;
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coll.drop();
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assert.commandWorked(coll.insert([
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{_id: 0, comments: [{user_id: "x", comment: "foo"}, {user_id: "y", comment: "bar"}]},
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{_id: 1, comments: [{user_id: "y", comment: "bar again"}]}
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]));
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// Test computing the most frequent commenters using $replaceRoot.
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let pipeline = [
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{$unwind: "$comments"},
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{$replaceRoot: {newRoot: "$comments"}},
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{$sortByCount: "$user_id"}
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];
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const expectedResults = [{_id: "y", count: 2}, {_id: "x", count: 1}];
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assert.eq(coll.aggregate(pipeline).toArray(), expectedResults);
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// Test the same thing but using the $replaceWith alias.
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pipeline = [{$unwind: "$comments"}, {$replaceWith: "$comments"}, {$sortByCount: "$user_id"}];
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assert.eq(coll.aggregate(pipeline).toArray(), expectedResults);
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}());
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