我正在执行从前端到后端的PUT请求,后端功能将更新我的Firestore数据库。该函数本身可以正常工作(可以通过邮递员等调用),但不能从前端调用,因为req.body始终是一个空对象。我当然检查了许多其他类似的情况,添加了一堆标题和其他内容,但是没有一个解决我的问题。这是我的后端代码:
router.put('/:id/results', async (req, res) => {
try {
console.log("Updating results...") //THIS IS LOGGED
console.log(req.body) // THIS LOGS {}
let hamsters = []
console.log(req.params.id) //LOGS ID
let snapShots = await db.collection('hamsters').where("id", "==", parseInt(req.params.id)).get()
snapShots.forEach(doc => {
hamsters.push(doc.data())
})
if (req.body.wins == 1) {
hamsters[0].wins++
res.send(`${hamsters[0].name} now has ${hamsters[0].wins} wins!`)
} else if (req.body.defeats == 1) {
hamsters[0].defeats++
res.send(`${hamsters[0].name} now has ${hamsters[0].defeats} defeats!`)
} else {
throw ("You must either increase wins or defeats by 1") //THIS IS LOGGED
}
hamsters[0].games++
db.collection('hamsters').doc(req.params.id).set(hamsters[0])
}
catch (err) {
console.error(err)
}
})
我的前端函数根据结果参数有两种不同的方法,现在它们看起来略有不同,只是说明我写请求的方式似乎无关紧要。该函数目前不返回任何内容,因为它只需要更新数据库。
export async function putBattleStats(hamsterID, outcome) {
try {
if (outcome === "win") {
const response = await fetch(`/hamsters/${hamsterID}/results`,
{
method: 'PUT', headers: { "Content-Type": "application/json/x-www-form-urlencoded" }, body: {
"hamsterID": JSON.stringify(hamsterID),
"wins": +1
}
})
} else if (outcome === "defeat") {
const response = await fetch(`/hamsters/${hamsterID}/results`,
{
method: 'PUT', body: {
"hamsterID": hamsterID,
"defeats": +1
}
})
}
}
catch (e) {
console.error('Fetch failed because', e)
return null
}
}
就像我说的那样,我已经尝试过各种头文件,已经安装了node-fetch,并且还将这些行放在了server.js文件中:
const bodyParser = require('body-parser')
server.use(bodyParser.urlencoded({ extended: true }));
server.use(bodyParser.json())
server.use(function(req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
next();
});
我只是希望我缺少明显的东西。
答案 0 :(得分:0)
可能是因为您没有对整个身体进行细化处理。
尝试一下:
const response = await fetch(`/hamsters/${hamsterID}/results`,
// change this URL
{
method: 'PUT',
headers: { 'Content-Type': 'application/json' },
// this can just be 'application/json' in your case
body: JSON.stringify({
hamsterID: hamsterID,
wins: 1
})
})