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arangodb/Documentation/Examples/documentDocumentUpdate.gene...

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arangosh> a1 = db.example.insert({ a : 1 });
{
"_id" : "example/1151660939",
"_rev" : "1151660939",
"_key" : "1151660939"
}
arangosh> a2 = db._update(a1, { b : 2 });
{
"_id" : "example/1151660939",
"_rev" : "1151988619",
"_key" : "1151660939"
}
arangosh> a3 = db._update(a1, { c : 3 });
[ArangoError 1200: precondition failed]