前言

為了讓使用者能評價bootcamp的好壞
藉此作為他們挑選課程的依據
我們要建立review model並reference bootcamp&user model
讓已註冊的使用者能對review進行CRUD functionality

Review Model

新增'./models/Review'
建立title, text, rating這三個type

const ReviewSchema = new mongoose.Schema({
  title: {
    type: String,
    trim: true,
    required: [true, 'Please add a title for the review'],
    maxlength: 100
  },
  text: {
    type: String,
    required: [true, 'Please add some text']
  },
  rating: {
    type: Number,
    min: 1,
    max: 10,
    required: [true, 'Please add a rating between 1 and 10']
  },
  createdAt: {
    type: Date,
    default: Date.now
  },
  bootcamp: {
    type: mongoose.Schema.ObjectId,
    ref: 'Bootcamp',
    required: true
  },
  user: {
    type: mongoose.Schema.ObjectId,
    ref: 'User',
    required: true
  }
});

GET Reviews

新增reviews controller
這邊要完成三種GET request：

• GET全部的reviews, 對應到的route為/api/v1/reviews
• GET特定bootcamp的review, 對應到的route為api/v1/bootcamps/:bootcampId/reviews
• GET指定id的review

第一種情況下，如果有輸入bootcampId, 回傳該bootcamp對應的reviews
第二種情況是回傳所有的reviews, 透過advancedResults middleware, 打包回傳的reviews(包含filtering, pagination等功能)

  if (req.params.bootcampId) {
    const reviews = await Review.find({ bootcamp: req.params.bootcampId});

    return res.status(200).json({
      success: true,
      count: reviews.length,
      data: reviews
    });
  } else {
    res.status(200).json(res.advancedResults);
  }

第三種情況是直接透過個別review的id從db尋找對應到的review

  const review = await Review.findById(req.params.id).populate({
    path: 'bootcamp',
    select: 'name description'
  });