使用数组解析外部 JSON 并保存

Question

我有一个 drupal 网站，在该网站上创建文章，然后以 JSON 格式输出到特定链接。我目前正在尝试解析 JSON 并保存 Parse Core 上文章的标题、正文等。 JSON 输出示例：

[
  {
    "vid": "2",
    "uid": "1",
    "title": "Post 2",
    "log": "",
    "status": "1",
    "comment": "0",
    "promote": "1",
    "sticky": "0",
    "nid": "2",
    "type": "article",
    "language": "und",
    "created": "1435932743",
    "changed": "1436089990",
    "tnid": "0",
    "translate": "0",
    "revision_timestamp": "1436089990",
    "revision_uid": "1",
    "body": {
      "und": [
        {
          "value": "Integer at mi blandit ipsum malesuada consectetur...",
          "summary": "",
          "format": "plain_text",
          "safe_value": "<p>Integer at mi blandit ipsum malesuada consectetur...</p>\n",
          "safe_summary": ""
        }
      ]
    },
    "field_tags": [],
    "field_image": [],
    "name": "uknj",
    "picture": "0",
    "data": "b:0;"
  },
  {
    "vid": "1",
    "uid": "1",
    "title": "Sample Post",
    "log": "",
    "status": "1",
    "comment": "0",
    "promote": "1",
    "sticky": "0",
    "nid": "1",
    "type": "article",
    "language": "und",
    "created": "1435931896",
    "changed": "1436090000",
    "tnid": "0",
    "translate": "0",
    "revision_timestamp": "1436090000",
    "revision_uid": "1",
    "body": {
      "und": [
        {
          "value": "Lorem ipsum dolor sit amet...",
          "summary": "",
          "format": "plain_text",
          "safe_value": "<p>Lorem ipsum dolor sit amet...</p>\n",
          "safe_summary": ""
        }
      ]
    },
    "field_tags": [],
    "field_image": [],
    "name": "uknj",
    "picture": "0",
    "data": "b:0;"
  }
]

我的代码部分基于this github。但是，由于 body 对象包含一个数组，我无法进一步解析它，并且包含我想要的文本的直接 body-value 无法保存。

我查看了this Stackoverflow question 仍然无法解决问题。正在返回错误 Cannot read property 'length' of undefined。值得注意的是，vid和title都保存成功了。

此外，仅记录了其中一个帖子，带有"vid" : "2" 的帖子，不知道为什么它不存储另一个帖子。

我的 main.js 代码：

var _ = require("underscore");
Parse.initialize('xyz', '123');
var Articles = Parse.Object.extend("Articles");
var article = new Articles();

Parse.Cloud.job("ArticleFeed", function(request, response) {
  Parse.Cloud.httpRequest({
        method: 'GET',
        url: 'URL HERE',
        success: function(httpResponse) {
         var data= JSON.parse(httpResponse.text);
           for (var i = 0; i < data[i].body.und.length; i++) {
        article = new Articles(),
        content = data[i];
        article.set("body", content.body.und[0].value);
        article.set("vid", content.vid);
        article.set("title", content.title);
        var epochTime = content.created;
        var newDate = moment.utc(1234567890000);
        article.set("date_created", newDate);

        articles.push(article);
      }

          article.save();

            response.success(httpResponse.text); // This will respond with the contents of the http response
        },
        error: function(httpResponse) {
            console.error('Request failed with response code ' + httpResponse.status);
            response.error('Request failed with response code ' + httpResponse.status);
        }
    });

});

编辑：这是正确的代码摘录，替换了上面不正确的 for 循环：

  for (var i = 0; i < data[i].body.und.length; i++) {
            article = new Articles(),
            content = data[i];
            article.set("body", content.body.und[0].value);
            article.set("vid", content.vid);
            article.set("title", content.title);

            articles.push(article);
      }

Answer 1

您的 JSON 输出是一个对象数组。

因此，如果您的 JSON 数据包含在变量中，例如“jsonData”，那么您可以从“jsonData”到达“body”，如下所示，

jsonData[0].body

然后要在 body 中获取数组，您应该像这样，

jsonData[0].body.und

在您的代码中，您没有正确访问数组，因此您会收到长度未定义的错误。