我的测试模式:
var TestSchema = new Schema({
testName: String,
topic: {
topicTitle: String,
topicQuestion: [
{
questionTitle: String,
choice: [
{
name: String
age: Number
}
]
}
]
}
}, { collection: 'test' });
var Test = mongoose.model('test', TestSchema);
我想更新一个具有选择ID的 age ($ inc)值。
我可以具有测试ID , topicQuestion ID 和选择ID 。
如何在NodeJS中用猫鼬编写此查询?
通常我使用以下查询来更新值:
Test.findOneAndUpdate({ _id: testId }, { $inc: { ... } }, function (err, response) {
...
});
但是很难进入一个数组和另一个数组。谢谢
答案 0 :(得分:1)
您可以使用$[] positional operator更新嵌套数组。
router.put("/tests/:testId/:topicQuestionId/:choiceId", async (req, res) => {
const { testId, topicQuestionId, choiceId } = req.params;
const result = await Test.findByIdAndUpdate(
testId,
{
$inc: {
"topic.topicQuestion.$[i].choice.$[j].age": 1
}
},
{
arrayFilters: [{ "i._id": topicQuestionId }, { "j._id": choiceId }],
new: true
}
);
res.send(result);
});
假设我们有此现有文档:
{
"_id" : ObjectId("5e53e7d9bf65ac4f5cbf2116"),
"testName" : "Test 1",
"topic" : {
"topicTitle" : "Title",
"topicQuestion" : [
{
"_id" : ObjectId("5e53e7d9bf65ac4f5cbf211a"),
"questionTitle" : "Question 1 Title",
"choice" : [
{
"_id" : ObjectId("5e53e7d9bf65ac4f5cbf211c"),
"name" : "A",
"age" : 1
},
{
"_id" : ObjectId("5e53e7d9bf65ac4f5cbf211b"),
"name" : "B",
"age" : 2
}
]
},
{
"_id" : ObjectId("5e53e7d9bf65ac4f5cbf2117"),
"questionTitle" : "Question 2 Title",
"choice" : [
{
"_id" : ObjectId("5e53e7d9bf65ac4f5cbf2119"),
"name" : "C",
"age" : 3
},
{
"_id" : ObjectId("5e53e7d9bf65ac4f5cbf2118"),
"name" : "D",
"age" : 4
}
]
}
]
},
"__v" : 0
}
如果我们想增加给定选择的age
值,则使用类似PUT
的端点发送http://.../tests/5e53e7d9bf65ac4f5cbf2116/5e53e7d9bf65ac4f5cbf211a/5e53e7d9bf65ac4f5cbf211b
请求,其中
"testId": "5e53e7d9bf65ac4f5cbf2116"
"topicQuestionId": "5e53e7d9bf65ac4f5cbf211a"
"choiceId": "5e53e7d9bf65ac4f5cbf211b"
答案 1 :(得分:0)
您需要告知所需的选择,并且在更新部分,需要更改增量方式。
示例:
Test.findOneAndUpdate({ _id: testId, topicQuestion.choice._id: choiceId}, { 'topicQuestion.$.choice': {$inc: { age: <numberToIncrement> }}}, {new: true}, function (err, response) {
...
});