我有這個代碼 -
const getAllCourses = async (req, res) => {
const courses = await Course.find({});
try {
await courses.populate('professor')
res.send({ status: 200, data: { courses } });
} catch (err) {
res.status(500).send({ status: 500, message: "Internal server error." });
}
};
另外，這是我從郵遞員那里得到的回復-
{
"status": 200,
"data": {
"courses": [
{
"_id": "61dc47f58f88c1a7e9bd36b6",
"name": "Course1",
"professor": "61dc1299431cd669faad7d0f",
"students": [
{
"student": "61dc0b7f103b531f105e8e4c",
"_id": "61dc47f58f88c1a7e9bd36b7"
},
{
"student": "61dc220885886a9f1d8e94d0",
"_id": "61dc47f58f88c1a7e9bd36b8"
}
],
"createdAt": "2022-01-10T14:51:33.313Z",
"updatedAt": "2022-01-10T14:51:33.313Z",
"__v": 0
},
{
"_id": "61dc47fb8f88c1a7e9bd36bf",
"name": "Course2",
"professor": "61dc1299431cd669faad7d0f",
"students": [
{
"student": "61dc0b7f103b531f105e8e4c",
"_id": "61dc47fb8f88c1a7e9bd36c0"
},
{
"student": "61dc220885886a9f1d8e94d0",
"_id": "61dc47fb8f88c1a7e9bd36c1"
}
],
"createdAt": "2022-01-10T14:51:39.704Z",
"updatedAt": "2022-01-10T14:51:39.704Z",
"__v": 0
}
]
}
}
現在我想做的是填充教授和學生，但它似乎不起作用。
我嘗試填充“courses.professor”、“course.professor”、“professor”，但對我沒有任何幫助。
我錯過了什么？
uj5u.com熱心網友回復：
這是一個如何對帶有陣列的檔案執行此操作的示例friends：
User.
findOne({ name: 'Val' }).
populate({
path: 'friends',
// Get friends of friends - populate the 'friends' array for every friend
populate: { path: 'friends' }
});
uj5u.com熱心網友回復：
我只是通過在populate之后直接鏈接方法來解決它Course.find({})并且它只是作業，但我不知道為什么。
解決方案：
const getAllCourses = async (req, res) => {
const courses = await Course.find({}).populate('professor').populate('students.student');
try {
res.send({ status: 200, data: { courses } });
} catch (err) {
res.status(500).send({ status: 500, message: err.message });
}
};
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