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arangodb/Documentation/Examples/api-transaction-abort-internal

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> curl --data @- -X POST --dump - http://localhost:8529/_api/transaction
{ "collections" : { "write" : [ "users" ] }, "action" : "var users = require(\"internal\").db.users; users.save({ _key: \"abc\" }); users.save({ _key: \"abc\" });" }
HTTP/1.1 400 Bad Request
content-type: application/json; charset=utf-8
{ "error" : true, "code" : 400, "errorNum" : 1210, "errorMessage" : "cannot save document: unique constraint violated" }