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19 lines
719 B
JavaScript
19 lines
719 B
JavaScript
t = db["jstests_coveredIndex2"];
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t.drop();
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t.save({a: 1})
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t.save({a: 2})
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assert.eq( t.findOne({a: 1}).a, 1, "Cannot find right record" );
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assert.eq( t.count(), 2, "Not right length" );
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// use simple index
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t.ensureIndex({a: 1});
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assert.eq( t.find({a:1}).explain().indexOnly, false, "Find using covered index but all fields are returned");
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assert.eq( t.find({a:1}, {a: 1}).explain().indexOnly, false, "Find using covered index but _id is returned");
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assert.eq( t.find({a:1}, {a: 1, _id: 0}).explain().indexOnly, true, "Find is not using covered index");
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// add multikey
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t.save({a:[3,4]})
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assert.eq( t.find({a:1}, {ln: 1, _id: 0}).explain().indexOnly, false, "Find is using covered index even after multikey insert");
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