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arangodb/Documentation/Examples/documentsCollectionUpdate.g...

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arangosh> a1 = db.example.insert({"a" : 1});
{
"error" : false,
"_id" : "example/466773442",
"_rev" : "466773442",
"_key" : "466773442"
}
arangosh> a2 = db.example.update(a1, {"b" : 2, "c" : 3});
{
"error" : false,
"_id" : "example/466773442",
"_rev" : "467166658",
"_key" : "466773442"
}
arangosh> a3 = db.example.update(a1, {"d" : 4});
[ArangoError 1200: precondition failed]
arangosh> a4 = db.example.update(a2, {"e" : 5, "f" : 6 });
{
"error" : false,
"_id" : "example/466773442",
"_rev" : "467822018",
"_key" : "466773442"
}
arangosh> db.example.document(a4);
{
"a" : 1,
"b" : 2,
"c" : 3,
"e" : 5,
"f" : 6,
"_id" : "example/466773442",
"_rev" : "467822018",
"_key" : "466773442"
}
arangosh> a5 = db.example.update(a4, {"a" : 1, c : 9, e : 42 });
{
"error" : false,
"_id" : "example/466773442",
"_rev" : "468084162",
"_key" : "466773442"
}
arangosh> db.example.document(a5);
{
"a" : 1,
"b" : 2,
"c" : 9,
"e" : 42,
"f" : 6,
"_id" : "example/466773442",
"_rev" : "468084162",
"_key" : "466773442"
}