Question

问题：

我正在创建具有Firebase集成的EXPO应用程序。在其中，我创建了一个配置文件以与数据库连接。这就是它的样子。

import Firebase from 'firebase';
 let config = {
    apiKey: "mykey",
    authDomain: "mytrain-5beba.firebaseapp.com",
    databaseURL: "https://mytain-5beba.firebaseio.com",
    projectId: "mytain-5beba",
    storageBucket: "mytain-5beba.appspot.com",
    messagingSenderId: "myid"
  };
let app = Firebase.initializeApp(config);
export const db = app.database();

在服务文件夹中，我已经创建了一个服务文件来处理诸如此类的操作。这样看起来。

从'../config/db'导入{db};

export const addItem =（item）=> { db.ref（'/ tains'）。push（{ 名称：物品 }）; }

在我的组件中，在componentDidMount方法中，我已经做了类似的事情来测试天气数据库连接是否正常工作。

import React, { Component } from "react";
import {
  StyleSheet,
  Text,
  TextInput,
  View,
  TouchableOpacity,
  Dimensions,
  Picker,
  ListView
} from "react-native";

import {
  Ionicons,
  Foundation,
  Entypo,
  MaterialCommunityIcons,
  FontAwesome,
  MaterialIcons
} from "@expo/vector-icons";

import { Autocomplete } from "react-native-autocomplete-input";

import { addItem } from '../../services/stationService';

const { height, width } = Dimensions.get("window");
const box_width = width / 2 + 40;

export default class TicketForm extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      name: ""
    };
  }

  static navigationOptions = {
    title: "",
    headerStyle: {
      backgroundColor: "#2b78fe"
    },
    headerTintColor: "#fff",
    headerTitleStyle: {
      color: "#ffff"
    }
  };

  componentDidMount() {
    const name = "Tharindu";
    addItem(name);
  }




  render() {
    return (
      <View>
        <Text>Haiii</Text>
      </View>
    );
  }
}


});

当我运行expo时，请启动--android。它向我显示了一些这样的警告。

[15:52:56] [2018-11-05T10:22:51.070Z]  @firebase/database:, FIREBASE WARNING: set at /station/-LQYOMpnDzgdkj25XUDQ failed: permission_denied
- node_modules\react-native\Libraries\ReactNative\YellowBox.js:80:15 in warn
- node_modules\expo\src\Expo.js:26:41 in warn
- ... 20 more stack frames from framework internals

[15:53:01] [Unhandled promise rejection: Error: PERMISSION_DENIED: Permission denied]
- node_modules\@firebase\database\dist\index.cjs.js:13076:45 in <unknown>
- node_modules\@firebase\database\dist\index.cjs.js:690:8 in exceptionGuard
- ... 18 more stack frames from framework internals

[15:53:04] Setting a timer for a long period of time, i.e. multiple minutes, is a performance and correctness issue on Android as it keeps the timer module awake, and timers can only be called when the app is in the foreground. See https://github.com/facebook/react-native/issues/12981 for more info.
(Saw setTimeout with duration 360595ms)
- node_modules\react-native\Libraries\ReactNative\YellowBox.js:80:15 in warn
- node_modules\expo\src\Expo.js:26:41 in warn
- ... 11 more stack frames from framework internals

[15:59:03] Setting a timer for a long period of time, i.e. multiple minutes, is a performance and correctness issue on Android as it keeps the timer module awake, and timers can only be called when the app is in the foreground. See https://github.com/facebook/react-native/issues/12981 for more info.
(Saw setTimeout with duration 92226ms)
- node_modules\react-native\Libraries\ReactNative\YellowBox.js:80:15 in warn
- node_modules\expo\src\Expo.js:26:41 in warn
- ... 11 more stack frames from framework internals

我对这些本机和firebase东西很陌生。有人可以帮我解决这个问题。谢谢！

Answer 1

打开firebase，在左侧选择数据库。现在，在右侧，从下拉列表中选择[实时数据库]，然后将规则更改为：

{
"rules": {
".read": true,
".write": true
}
}

有效.. !!

在Firebase中写入数据数据库时拒绝acces

1 个答案: