File: update_addToSet2.js

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mongodb 1%3A2.0.6-1.1
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t = db.update_addToSet2
t.drop();

o = { _id : 1 }
t.insert( { _id : 1 } );

t.update({},{$addToSet : {'kids' :{ 'name' : 'Bob', 'age': '4'}}})
t.update({},{$addToSet : {'kids' :{ 'name' : 'Dan', 'age': '2'}}})

printjson( t.findOne() );