多階層ドキュメントのMongoDBによるデータ更新方法

{name: 'Island Coder', documents: ['Getting Started with Flutter and Hands-On', 'High Performance MySQL', 'MongoDB Pro Guide']}

db.author.update(
  {name: 'Island coder', documents: 'MongoDB Professional North' }, 
  {'$set': {'documents.$': 'MongoDB not pro north'}}
);

{
  name: 'Island Coder', 
  documents: [
    {name: 'Getting Started with Flutter', score: 80}, 
    {name: 'High Performance MySQL', score: 90}, 
    {name: 'MongoDB Professional Guide', score: 85}
  ]
}

db.author.update(
  {name: 'Island coder', 'documents.name': 'MongoDB Pro Guide'},
  {'$set': {
    	'documents.$.name': 'MongoDB Unprofessional North', 
    	'documents.$.score':88}
  }
);

{
  name: 'Island Coder', 
  scores: {
    view: 18800, 
    praise: 290, 
    followers: 105
	}
}

db.author.update(
  {name: 'Island coder'}, 
  {'$set': {'scores.praise': 291}}
);

{
  name: 'Island Coder', 
  scores: {
    view: 18800, 
    praise: 290, 
    followers: 105,
    platform: ['Nuggets', 'Public']
	}
}

db.author.update(
  {'name': 'Island Coder', 'scores.platform': 'Public' }
  {'$set': {'scores.platform.$': 'WeChat Public'}}
);

db.author.update(
  {name: 'Island Coder'}, 
  {$push: {homepage: 'https://juejin.cn/user/70787819648695'}}
);

db.author.update(
  {name: 'Island Coder'}, 
  {$pull: {homepage: 'https://juejin.cn/user/70787819648695'}}
);

{
  name: 'Island Coder',
	scores : {
		view: 18800,
		praise: 290,
		followers: 105,
		platform: ['Nuggets', 'Public', 'Other1', 'Other2']
	}
}

// Remove the first element
db.author.update({name: 'Island Coder'}, {$pop: {'scores.platform': -1}});
// Remove the last element
db.author.update({name: 'Island coder'}, {$pop: {'scores.platform': 1}});