Firebase iOS - 使用复合键的一部分查询

Question

在我的Firebase数据库中，我使用复合键作为以按照字典顺序排列的以下格式“UID1_UID2”中的一对一对话的ID。

当我想通过iOS客户端为特定用户（UID1）加载所有对话时，如何在复合键由两个组合用户ID组成的情况下查询Firebase。

Answer 1

queryStartingAt("UID1_").queryEndingAt("UID1_") 

将返回所有对话UID1_开始。

您应该构建您的数据

conversation: UID1_UID2 

Answer 2

复合键都没有很大的想法。请参考this part of the documentation，它解释了如何最佳建模聊天/对话结构。

相关摘录演示了如何构造数据，聊天记录：

{ 
    // Chats contains only meta info about each conversation 
    // stored under the chats's unique ID 
    "chats": { 
    "one": { 
     "title": "Historical Tech Pioneers", 
     "lastMessage": "ghopper: Relay malfunction found. Cause: moth.", 
     "timestamp": 1459361875666 
    }, 
    "two": { ... }, 
    "three": { ... } 
    }, 

    // Conversation members are easily accessible 
    // and stored by chat conversation ID 
    "members": { 
    // we'll talk about indices like this below 
    "one": { 
     "ghopper": true, 
     "alovelace": true, 
     "eclarke": true 
    }, 
    "two": { ... }, 
    "three": { ... } 
    }, 

    // Messages are separate from data we may want to iterate quickly 
    // but still easily paginated and queried, and organized by chat 
    // conversation ID 
    "messages": { 
    "one": { 
     "m1": { 
     "name": "eclarke", 
     "message": "The relay seems to be malfunctioning.", 
     "timestamp": 1459361875337 
     }, 
     "m2": { ... }, 
     "m3": { ... } 
    }, 
    "two": { ... }, 
    "three": { ... } 
    } 
}