Firebase：如何爲嵌套字段添加索引？

Question

我有一個locations-orders表看起來像這樣：

{ 
    "0BW3H9T3R7HJB" : { 
    "orders" : { 
     "01750ea0-4980-4bc4-58b2-988c02324e671478636582396" : { 
     "created_at" : 1478636560000, 
     }, 
     "01750ea0-4980-4bc4-58b2-988c02324e671478636582483" : { 
     "created_at" : 1478636560000, 
     } 
    } 
} 

每個位置訂單節點有多個鍵/對象的orders節點。這些對象上有一個created_at字段。

我說這我的數據庫規則：

{ 
    "rules": { 
    ".read": true, 
    ".write": true, 
    "users": { 
     ".indexOn": "merchantId" 
    }, 
    "merchants": { 
     ".indexOn": "locations" 
    }, 
    "locations-orders": { 
     ".indexOn": ["orders/created_at"] 
    } 
    } 
} 

然而，火力地堡仍然抱怨說，我失去了一個索引：

Using an unspecified index. Consider adding ".indexOn": "created_at" at /locations-orders/1JS53G0TT5ZQD/orders to your security rules for better performance 

我應該運行的東西創建索引？還是它寫錯了？

=== UPDATE ===

我改變了我的文件來看看：

{ 
    "rules": { 
    ".read": true, 
    ".write": true, 
    "users": { 
     ".indexOn": "merchantId" 
    }, 
    "merchants": { 
     ".indexOn": "locations" 
    }, 
    "locations-orders": { 
     "$location_id": { 
     ".indexOn": ["orders/created_at", "orders/status_updated_at"] 
     } 
    } 
    } 
} 

，但我仍然得到同樣的警告：

Using an unspecified index. Consider adding ".indexOn": "created_at" at /locations-orders/1JS53G0TT5ZQD/orders to your security rules for better performance 

Answer 1

試試這個：

{ 
    "rules": { 
    ".read": true, 
    ".write": true, 
    "users": { 
     ".indexOn": "merchantId" 
    }, 
    "merchants": { 
     ".indexOn": "locations" 
    }, 
    "locations-orders": { 
     "orders": { 
     "$orderid": { 
      ".indexOn": "created_at" 
     } 
     } 
    } 
    } 
} 

Answer 2

如果你l在你的數據結構中，沒有orders/created_at在/location-order/$orderId下。

{ 
    "rules": { 
    ".read": true, 
    ".write": true, 
    "users": { 
     ".indexOn": "merchantId" 
    }, 
    "merchants": { 
     ".indexOn": "locations" 
    }, 
    "locations-orders": { 
     "$someid": { 
     ".indexOn": ["orders/created_at"] 
     } 
    } 
    } 
}