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mdirolf/gist:468712

Created July 8, 2010 21:59
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MongoDB insert if not present
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gistfile1.js
> db.test.find()
> db.test.update({foo: 1, bar: 2}, {$set: {}}, true);
> db.test.find()
{ "_id" : ObjectId("4c3649f8dd24e71e36ca6f69"), "bar" : 2, "foo" : 1 }
> db.test.update({foo: 1, bar: 2}, {$set: {}}, true);
> db.test.find()
{ "_id" : ObjectId("4c3649f8dd24e71e36ca6f69"), "bar" : 2, "foo" : 1 }
> db.test.update({foo: 1}, {$set: {}}, true);
> db.test.find()
{ "_id" : ObjectId("4c3649f8dd24e71e36ca6f69"), "bar" : 2, "foo" : 1 }
> db.test.update({foo: 1, bar: 3}, {$set: {}}, true);
> db.test.find()
{ "_id" : ObjectId("4c3649f8dd24e71e36ca6f69"), "bar" : 2, "foo" : 1 }
{ "_id" : ObjectId("4c364a0bdd24e71e36ca6f6a"), "bar" : 3, "foo" : 1 }
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