[英]Querying a nested array in MongoDB
这是我在MongoDB中posting
文档:
{
"_id": {
"$oid": "5b4e60ab24210138f5746402"
},
"type": [
"full",
"temp"
],
"applications": [
{
"_id": {
"$oid": "5b52113d1123631744fa9f39"
},
"applicationDate": {
"date": 20,
"day": 5,
"hours": 18,
"minutes": 43,
"month": 6,
"seconds": 41,
"time": 1532105021753,
"timezoneOffset": -120,
"year": 2018
},
"userId": {
"$oid": "5b51fb6f9686430cee31a0d9"
},
"resume": {
"fieldname": "resume",
"originalname": "resume_acc.pdf",
"encoding": "7bit",
"mimetype": "application/pdf",
"destination": "./public/resumes/",
"filename": "765d650b9014cc3ddadb801d10d495a5",
"path": "public/resumes/765d650b9014cc3ddadb801d10d495a5",
"size": 8
},
"coverLetter": {
"fieldname": "docs",
"originalname": "cover letter.pdf",
"encoding": "7bit",
"mimetype": "application/pdf",
"destination": "./public/resumes/",
"filename": "e5892869b24f3fc5e72d3e057b4dd61d",
"path": "public/resumes/e5892869b24f3fc5e72d3e057b4dd61d",
"size": 5
}
}
],
"creatorId": {
"$oid": "5b4b95cc16778c325010a55d"
},
"title": "Developer",
"salary": "50/h",
"timeLine": "One year",
"description": "You'll be building apps",
"duties": "Building apps",
"experience": "2 years",
"province": "ON",
"visible": true,
"__v": 0
}
Postings是一系列的posting
,看起来像上面的文档。 applications
是每个posting
中都有一个数组。 我想搜索所有postings.applications
以查看获得用户应用到的所有帖子。 现在,我试图这样做:
var Posting = require('../models/posting');
var postings = await Posting
.find({'visible': true});
console.log('posts', postings);
var applications = await Posting
.find({'visible': true})
.where(postings
.map(posting => posting.applications
.map(application => application.userId.equals(req.user._id)))
);
但是显然这失败了。
我也尝试过这个:
var postings = await Posting
.find({'visible': true, 'applications[$].userId': req.user._id});
要么
var postings = await Posting
.find({'visible': true, 'applications.$.userId': req.user._id});
但是没有运气。 它们都返回一个空数组。
过帐模型:
var mongoose = require('mongoose');
jobPostingSchema = mongoose.Schema({
"creatorId": mongoose.Schema.Types.ObjectId, //ObjectID('aaaa'), // ID of the User or Account
"eventId": {'type': mongoose.Schema.Types.ObjectId, 'default': undefined},
"title": String,
"type": [], //"Full", // What this means? I did not understand.
"salary": String,
"timeLine": String, // What this means? I did not understand.
"description": String,
"duties": String,
"experience": String,
"province": String, // Employer will post job postings based on the province and region
// Applications means, how many people applied for this job post?
"applications": [
// {
// ObjectID: cccc,
// userId: dddd,
// Resume: {},
// coverLetter: String,
// },
],
"visible": Boolean,
});
module.exports = mongoose.model('posting', jobPostingSchema);
那么,如何获得userId
等于req.user._id
所有applications
?
Posting.find({
'visibile:': true,
'applications': {
$elemMatch: { userId: req.user._id }
}
});
$elemMatch
是您可能需要的mongo运算符。 希望能有所帮助。
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