我使用 swr firestore 从 firestore 获取数据:
这是我的代码:
import { Divider } from '@ui-kitten/components';
import React, { useEffect, useState } from 'react';
import { ScrollView, StyleSheet, Text } from 'react-native';
import { useCollection } from '@nandorojo/swr-firestore'
import { NavigationBar } from '../common';
import { SafeAreaView } from 'react-native-safe-area-context';
import { GetCurrentMerchantId } from '../../data/storage';
import { FoodMenuListTemplate } from "../templates";
export default function FoodMenuSelector({ navigation, route }) {
const [merchantId, setMerchantId] = useState('');
const [data, setData] = useState([]);
const { data: dataFromServer, error } = useCollection(`FoodMenus`, {
where: ['merchantId', '==', merchantId],
listen: true
})
if (error) return <Text>Error!</Text>
if (!dataFromServer) return <Text>Loading...</Text>
useEffect(() => {
const setMerchantById = async () => {
const currentMerchantId = await GetCurrentMerchantId();
setMerchantId(currentMerchantId);
}
setMerchantById();
}, []);
setData(dataFromServer);
const onItemPress = (selectedItem) => {
selectedItem.selected = !selectedItem.selected;
const filtered = data.filter(item => item.id != selectedItem.id);
filtered.push(selectedItem);
setData(filtered);
}
return (
<SafeAreaView
insets='top'>
<NavigationBar
title={'Food Menu'}
subtitle={'Select food menu'}
hasBack={true}
onSave={() => {
route.params.onMenusSelected(data.filter(item => item.selected));
navigation.goBack();
}} />
<Divider />
<ScrollView style={styles.container}>
{data.length == 0 ?
<Text style={{ textAlign: 'center', marginTop: 50 }}>No Food Menu Found, Create one ...</Text>
: <FoodMenuListTemplate data={data} onItemPress={onItemPress} />}
</ScrollView>
</SafeAreaView>
)
}
const styles = StyleSheet.create({
container: {
margin: 10
}
});
但出现错误:Rendered more hooks than during the previous render
这个想法是我想从 firestore use swr firestore 获取数据并将该数据设置为 setData
,这样我就可以在发生任何事件和更改时操作数据。
但在此之前,我必须从 asyncstorage 获取当前商家。
如何解决这个问题?我仍然困惑如何正确使用钩子