jstests/core/explain_upsert.js


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// Test explain for {upsert: true} updates.

var t = db.jstests_explain_upsert;
t.drop();

var explain;

// Explained upsert against an empty collection should succeed and be a no-op.
explain = db.runCommand({
    explain: {
        update: t.getName(),
        updates: [
            {q: {a: 1}, u: {a: 1}, upsert: true}
        ]
    }
});
assert.commandWorked(explain);

// Collection should still not exist.
assert.eq(0, t.count());
assert(!t.drop());

// Add a document to the collection.
t.insert({a: 3});

// An explained upsert against a non-empty collection should also succeed as a no-op.
explain = db.runCommand({
    explain: {
        update: t.getName(),
        updates: [
            {q: {a: 1}, u: {a: 1}, upsert: true}
        ]
    }
});
assert.commandWorked(explain);
assert.eq(1, t.count());