arangoDBで重複を避ける方法

Question

arangoDBの使用中に重複したドキュメント（自動生成された_key）をアップロードするのを避けるための「簡単な」方法はありますか？

Answer 1

これを行う方法は、to use a uniq hash indexです。しかし、それはそれの部分だけ、完全な文書の上に作成することができません：あなたが言ったこと

db._create("testuniq") 
[ArangoCollection 25260888467, "testuniq" (type document, status loaded)] 
arangosh [_system]> db.testuniq.ensureIndex({ type: "hash", fields:["uniqDocument", "uniqAttribute"], unique: true }) 
{ 
    "id" : "testuniq/25264886163", 
    "type" : "hash", 
    "fields" : [ 
    "uniqDocument", 
    "uniqAttribute" 
    ], 
    "selectivityEstimate" : 1, 
    "unique" : true, 
    "sparse" : false, 
    "isNewlyCreated" : true, 
    "code" : 201 
} 
arangosh [_system]> db.testuniq.save({uniqDocument: {foo: "bar"}}) 
arangosh [_system]> db.testuniq.save({uniqDocument: {foo: "bar"}}) 
JavaScript exception in file 'js/client/modules/org/arangodb/arangosh.js' at 106,13: ArangoError 1210: cannot create document, unique constraint violated 
!  throw error; 
!   ^
stacktrace: ArangoError: cannot create document, unique constraint violated 
    at Object.exports.checkRequestResult (js/client/modules/org/arangodb/arangosh.js:104:21) 
    at ArangoCollection.save.ArangoCollection.insert (js/client/modules/org/arangodb/arango-collection.js:1014:12) 
    at <shell command>:1:13 
arangosh [_system]> db.testuniq.save({uniqAttribute: "bar"}) 
arangosh [_system]> db.testuniq.save({uniqAttribute: "bar"}) 
JavaScript exception in file 'js/client/modules/org/arangodb/arangosh.js' at 106,13: ArangoError 1210: cannot create document, unique constraint violated 
!  throw error; 
!   ^
stacktrace: ArangoError: cannot create document, unique constraint violated 
    at Object.exports.checkRequestResult (js/client/modules/org/arangodb/arangosh.js:104:21) 
    at ArangoCollection.save.ArangoCollection.insert (js/client/modules/org/arangodb/arango-collection.js:1014:12) 
    at <shell command>:1:13