我正在尝试在节点js中使用populate()。
好吧,我正在尝试将一个集合的objectId访问到另一个集合。
例如,我有一个名为Project和events的集合,
我有这样的架构。
项目架构:
const projectSchema = mongoose.Schema({
_id: mongoose.Schema.Types.ObjectId,
projectName: {
type: String,
required: true,
unique: true
},
dimensions: {
type: [],
required: false
},
events: {
[type: mongoose.Schema.Types.ObjectId],
ref: 'EnrichedEvent'
},
});
module.exports = mongoose.model('Project', projectSchema);
事件架构:
const enrichedEventSchema = mongoose.Schema({
_id: mongoose.Schema.Types.ObjectId,
projectId: {
type: mongoose.Schema.Types.ObjectId,
ref: 'Project',
required: true
},
name: {
type: String,
required: true
},
type: {
type: String,
enum: ["Enriched"],
required: true
},
source: {
type: String,
required: true
},
});
以及项目的路由代码到:
const express = require("express");
const router = express.Router();
const mongoose = require("mongoose");
const Project = require("../models/project");
router.get("/", (req, res, next) => {
Project.find()
.populate('source', 'EnrichedEvents') //When i use this populate method, I m not able to GET any events on to browser..
.exec()
.then(docs => {
const response = {
count: docs.length,
projects: docs.map(doc => {
return {
projectName: doc.projectName,
dimensions: doc.dimensions,
events: doc.events,
_id: doc._id
};
})
};
res.status(200).json(response);
})
.catch(err => {
console.log(err);
res.status(500).json({
error: err
});
});
});
router.post("/", (req, res, next) => {
const project = new Project({
_id: new mongoose.Types.ObjectId(),
projectName: req.body.projectName,
events: req.body.events
});
project
.save()
.then(result => {
console.log(result);
res.status(201).json({
message: "Created project successfully",
createdProject: {
projectName: result.projectName,
_id: result._id,
events: result.events,
}
});
})
.catch(err => {
console.log(err);
res.status(500).json({
error: err
});
});
});
module.exports = router;
我的问题是我无法在项目页面中自动填充丰富的
eventsId
。例如每当我更新事件时,它们都应出现在项目页面中。在事件页面中,我也没有得到相应的projectId。请指出正确的方向。
最佳答案
填充方法采用FIELD_TO_POPULATE
和FIELDS_TO_RETURN_FROM_POPULATED_DOC
,并且您以相反的方式传递它。同样在项目模式中,您将events
用作EnrichedEvent
,因此在填充时,请使用events
而不是EnrichedEvent
。
请尝试以下操作:
从:.populate('source', 'EnrichedEvents')
至:.populate('events', 'EnrichedEvent')
编辑:
更新EnrichedEvent
的架构:
events: [{
mongoose.Schema.Types.ObjectId,
ref: 'EnrichedEvent'
}]
现在应该可以工作了。
关于javascript - 在 Mongoose 中填充方法( Node js),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/50168755/