如何使用ajax和jquery向嵌套json数组添加多个对象

我需要使用jquery和ajax将多个对象插入到mongodb json数组中。我只想更新mealReviews数组。同时保持其他一切不变。但当我使用PUT方法时，它会用新输入的信息替换现有代码

 {
"_id": {
    "$oid": "57afc7636"
},
"mealIDa": "ACT",
"mealIDb": "TMNT2",
"genre": "Action",
"title": "Teenage Mutant Ninja Turtles 2 The Secret of the Ooze",
"description": "The Teenage Mutant Ninja Turtles (Mark Caso, Michelan Sisti, Leif Tilden, Kenn Troum) again battle their archenemy, the rogue ninja Shredder (Francois Chau). Shredder attempts revenge by obtaining the same radioactive ooze that created the Turtles and unleashing two new monstrous mutants: Tokka, an oversized snapping turtle, and Rahzar, a fearsome wolf-like creature. When Shredder plans to use the remaining ooze on himself, the Turtles must harness their ninja fighting skills to stop him.",
"poster": "TMNT2.jpg",
"mealPoster": "tmnt2.jpg",
"mealSrc": "02 Teenage Mutant Ninja Turtles II The Secret of the Ooze.mp4",
"releaseDate": "March 22, 1991",
"language": "English",
"subtitle": false,
"srt": "Teenage Mutant Ninja Turtles II The Secret of the Ooze.srt",
"director": "Michael Pressman",
"actors": "Paige Turco \"April O'Neil\", Vanilla Ice, Michelan Sisti \"Michelangelo, Soho Man\", Robbie Rist \"Michelangelo\", Kevin Clash \"Splinter\"",
"studio": "Golden Harvest Company, New Line Cinema, Northshore Investments Ltd.",
"hrs": 1,
"mins": 28,
"ratings": "PG \u2013 Parents Cautioned",
"dateAdded": "2017-07-18T20:59:17.473Z",
    "mealReviews": [
    {
        "username": "user1",
        "accountType": "viewer",
        "subject": "Great movie!",
        "rating": "4",
        "review": "the best of the time",
        "reviewDate": "2017-07-24T21:03:00.786Z"
       }
      ]
     }

   var mealReviews = [];
   var mealData = ({
       "username": mealUsername,
       "accountType": mealAccountType,
       "subject": mealSubject,
       "rating": mealRating,
       "review": mealReview,
       "reviewDate": reviewDate
   });


    mealReviews.push(new Object(mealData));

然后我使用ajaxput方法更新mongodb，在更新数组时这正确吗

      $.ajax( { url: 'https://api.mlab.com/api/1/databases/movie_meals/collections/meals/'+ meal_id + '?apiKey=JVUavJ75zT7u4s2_0Ihmzjn6sS9TEEpn',
      data: JSON.stringify({
        "mealReviews": mealReviews
      }),
          type: "PUT",
          contentType: "application/json; charset=utf-8",
          dataType: "json",
          success:function(data){
            $('#mealDetails').hide();
            $('#admin').hide();
            $('#meals').show();
          },
          error:function(xhr,status,err){
            console.log(err);
          }
        });

---

您需要使用changed

mealReviews

property发回以前检索到的整个对象

var meal = // do whatever magic to get your meal object from Mongo
meal.mealReviews = mealReviews;
// save your 'meal' object in the way you described