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t = db.update_arraymatch5;
t.drop();
t.insert({abc: {visible: true}, testarray: [{foobar_id: 316, visible: true, xxx: 1}]});
t.ensureIndex({'abc.visible': 1, 'testarray.visible': 1, 'testarray.xxx': 1});
assert(t.findOne({'abc.visible': true, testarray: {'$elemMatch': {visible: true, xxx: 1}}}), "A1");
assert(t.findOne({testarray: {'$elemMatch': {visible: true, xxx: 1}}}), "A2");
t.update({'testarray.foobar_id': 316},
{'$set': {'testarray.$.visible': true, 'testarray.$.xxx': 2}},
false,
true);
assert(t.findOne(), "B1");
assert(t.findOne({testarray: {'$elemMatch': {visible: true, xxx: 2}}}), "B2");
assert(t.findOne({'abc.visible': true, testarray: {'$elemMatch': {visible: true, xxx: 2}}}), "B3");
assert.eq(1, t.find().count(), "B4");
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