是ArangoDB邊緣文件放置附加鍵值的正確位置嗎？

Question

在MySql中，我們創建了兩個模型用戶和友誼的簡單用戶友情數據庫。

模型友誼包含鍵：（REF鍵）

• ID
• 從（REF鍵）
• 到
• 創建
• 改性
• 批准（0,1 ）
• block（0,1）

在ArangoDB中製作相同的正確方法是什麼？ 有沒有添加關鍵值的「友誼」邊緣文檔？ 是否可以執行更新邊緣文檔？ 另外，執行請求後可能會顯示這些值嗎？

Answer 1

給我一個例子。

首先創建一個「用戶」集合和一個「友誼」集合。

arangosh [_system]> db._create("users"); 
[ArangoCollection 33746098, "users" (type document, status loaded)] 

arangosh [_system]> db._createEdgeCollection("friendship"); 
[ArangoCollection 33877170, "friendship" (type edge, status loaded)] 

創建兩個用戶

arangosh [_system]> db.users.save({_key: "you"}); 
{ 
    "_id" : "users/you", 
    "_rev" : "34598066", 
    "_key" : "you" 
} 

arangosh [_system]> db.users.save({_key: "me"}); 
{ 
    "_id" : "users/me", 
    "_rev" : "34794674", 
    "_key" : "me" 
} 

以及它們之間

arangosh [_system]> db.friendship.save("users/me", "users/you", {}); 
{ 
    "_id" : "friendship/35515570", 
    "_rev" : "35515570", 
    "_key" : "35515570" 
} 

檢查用戶

arangosh [_system]> db._query("FOR u IN users RETURN u").toArray() 
[ 
    { 
    "_id" : "users/me", 
    "_rev" : "34794674", 
    "_key" : "me" 
    }, 
    { 
    "_id" : "users/you", 
    "_rev" : "34598066", 
    "_key" : "you" 
    } 
] 

及其鄰國

的關係

arangosh [_system]> db._query("FOR u IN users RETURN { user: u, friends: NEIGHBORS(users, friendship, u, 'outbound') }").toArray() 
[ 
    { 
    "user" : { 
     "_id" : "users/me", 
     "_key" : "me", 
     "_rev" : "34794674" 
    }, 
    "friends" : [ 
     "users/you" 
    ] 
    }, 
    { 
    "user" : { 
     "_id" : "users/you", 
     "_key" : "you", 
     "_rev" : "34598066" 
    }, 
    "friends" : [ ] 
    } 
] 

附加 「塊」

arangosh [_system]> db._query("FOR f IN friendship FILTER f._from == 'users/me' and f._to == 'users/you' UPDATE f WITH { block: true } IN friendship RETURN { before: OLD, after: NEW }").toArray() 
[ 
    { 
    "before" : { 
     "_id" : "friendship/35515570", 
     "_rev" : "35515570", 
     "_key" : "35515570", 
     "_from" : "users/me", 
     "_to" : "users/you" 
    }, 
    "after" : { 
     "block" : true, 
     "_id" : "friendship/35515570", 
     "_rev" : "63892658", 
     "_key" : "35515570", 
     "_from" : "users/me", 
     "_to" : "users/you" 
    } 
    } 
] 

返回將返回整個文檔。您也可以只返回塊屬性

arangosh [_system]> db._query("FOR f IN friendship FILTER f._from == 'users/me' and f._to == 'users/you' UPDATE f WITH { block: false } IN friendship RETURN { before: OLD.block, after: NEW.block }").toArray() 
[ 
    { 
    "before" : true, 
    "after" : false 
    } 
]