Question

我正在使用react-native-gifted-chat（https://github.com/FaridSafi/react-native-gifted-chat）在我的应用程序上创建一个聊天界面，我想从数据库中加载消息。

我正在使用领域，并且能够加载数据，但是下面的代码仅加载数据的第一行。我希望能够从数据库中加载所有数据。

    let chatData = realmDatabase.objects(DatabaseTableNames.chatTable);

    let data=[];

    for (let message of chatData ){

      data =  [{
                        _id: message.chatUniqueID,
                        text: message.msgBody,
                        createdAt: (new Date()).getTime(),
                        user: {
                           _id: message.chatUniqueID,
                           name: message.senderName
                       }
                 } ]


    }



   console.log(data)

我希望能够从数据库中不仅加载第一行中的所有数据，如下面的示例一样。

   [
      {
        _id: Math.round(Math.random() * 1000000),
        text:
          "It uses the same design as React, letting you compose a rich mobile UI from declarative components https://facebook.github.io/react-native/",
        createdAt: new Date(Date.UTC(2016, 7, 31, 17, 20, 0)),
        user: {
          _id: 1,
          name: "Developer"
        },

      },

      {
        _id: Math.round(Math.random() * 1000000),
        text: "React Native lets you build mobile apps using only JavaScript",
        createdAt: new Date(Date.UTC(2016, 7, 30, 17, 20, 0)),
        sent: true,
        received: true,
        user: {
          _id: 2,
          name: "Developer"
      },

      }
    ];

Answer 1

在for循环中执行data = [{...}]，会将message的最后一个值分配给data。要获取所有值，需要push data数组中的项目。您可以这样做：

let chatData = realmDatabase.objects(DatabaseTableNames.chatTable);

let data=[];

for (let message of chatData ){
    data.push({
        _id: message.chatUniqueID,
        text: message.msgBody,
        createdAt: (new Date()).getTime(),
        user: {
            _id: message.chatUniqueID,
            name: message.senderName
        }
    });
}

console.log(data)

从本地数据库加载所有数据

1 个答案: