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// Tests that _id will exist in all updated docs.
t = db.jstests_updatem;
t.drop();
// new _id from insert (upsert:true)
t.update({a: 1}, {$inc: {b: 1}}, true);
var doc = t.findOne({a: 1});
assert(doc["_id"], "missing _id");
// new _id from insert (upsert:true)
t.update({a: 1}, {$inc: {b: 1}}, true);
var doc = t.findOne({a: 1});
assert(doc["_id"], "missing _id");
// no _id on existing doc
t.getDB().runCommand({godinsert: t.getName(), obj: {a: 2}});
t.update({a: 2}, {$inc: {b: 1}}, true);
var doc = t.findOne({a: 2});
assert(doc["_id"], "missing _id after update");
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