如何使用ajax和jquery将多个对象添加到嵌套的json数组中

Question

我需要使用jquery & 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。但是当我使用PUT方法时，它会用新输入的信息替换我现有的代码。

 {
"_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AJAX PUT方法更新mongodb，在更新数组时这样做正确吗？

      $.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);
          }
        });

Answer 1

您需要使用更改后的mealReviews属性回发之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