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node.js - Node + Mongoose：填充 ref 对象数组

问题描述

我需要根据他们的 ID 填充评论，这些 ID 作为评论数组保存在另一个模式 == Project中。

项目

const projectSchema = new mongoose.Schema({
    user: { type: mongoose.Schema.Types.ObjectId, required: true, ref: 'User' },
    title: { type: String, required: true },
    description: { type: String, required: true, minLength: 200, maxlength: 500 },
    // comments: { type: Array, default: [], ref: 'Comment' },
    comments: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Comment' }],
})

评论：

const commentSchema = new mongoose.Schema({
    comment: { type: String, required: true },
    project: { type: String, required: true, ref: 'Project' },
    user: { type: String, required: true, ref: 'User' }
)}

我想要什么？

我想对特定项目进行填充和评论。这就是我正在做的事情，它返回 null：

router.get('/:projectId', currentUser, authenticate, async (req: Request, res: Response) => {
    // search the project 
    const project = await Project.findById(req.params.projectId).populate('comment')
    // return the populated comments 
    console.log('THE LIST OF PROJECT', project)  // <-------- null
    res.send(project)
})

标签： node.jsmongodbexpressmongoose

解决方案

试试这个项目架构

  const projectSchema = new mongoose.Schema({
      user: { type: mongoose.Schema.Types.ObjectId, required: true, ref: 'User' },
      title: { type: String, required: true },
      description: { type: String, required: true, minLength: 200, maxlength: 500 },
      comments: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Comment' }]
    });

并在填充时使用“评论”

const project = await Project.findById(new mongoose.Types.ObjectId(req.params.projectId)).populate('comments')

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