nestjs学习（六）

扩展学习 mongoose相关操作

1. 相关操作

   • Model.deleteMany()
   • Model.deleteOne()
   • Model.find()
   • Model.findById()
   • Model.findByIdAndDelete()
   • Model.findByIdAndRemove()
   • Model.findByIdAndUpdate()
   • Model.findOne()
   • Model.findOneAndDelete()
   • Model.findOneAndRemove()
   • Model.findOneAndUpdate()
   • Model.replaceOne()
   • Model.updateMany()
   • Model.updateOne()

2. query

    // With a JSON doc
    Person.
      find({
        occupation: /host/,
        'name.last': 'Ghost',
        age: { $gt: 17, $lt: 66 },
        likes: { $in: ['vaporizing', 'talking'] }
      }).
      limit(10).
      sort({ occupation: -1 }).
      select({ name: 1, occupation: 1 }).
      exec(callback);
   
    // Using query builder
    Person.
      find({ occupation: /host/ }).
      where('name.last').equals('Ghost').
      where('age').gt(17).lt(66).
      where('likes').in(['vaporizing', 'talking']).
      limit(10).
      sort('-occupation').
      select('name occupation').
      exec(callback);
   
    // Using populate  获取外码相关表
    User.
    findOne({ name: 'Val' }).
    populate({
      path: 'friends',
      // Get friends of friends - populate the 'friends' array for every friend
      populate: { path: 'friends' } // 获取外码的外码
    });