Javascript:具有多个查询参数的嵌套 JSON api 请求

Question

我尝试为我的下一个网站制作 API，但在 Express 应用程序中无法使用相同的 url 获取多个查询结果。

虚拟数据:

var data = [{
    articles : [{
        id : '0',
        url : 'foo',
        title : 'Foo',
        body : 'some foo bar',
        category : 'foo',
        tags : [
            'foo'
        ]
    }, {
        id : '1',
        url : 'foo-bar',
        title : 'Foo bar',
        body : 'more foo bar',
        category : 'foo',
        tags : [
            'foo', 'bar'
        ]
    }, {
        id : '2',
        url : 'foo-bar-baz',
        title : 'Foo bar baz',
        body : 'more foo bar baz',
        category : 'foo',
        tags : [
            'foo',
            'bar',
            'baz'
        ]
    }]
}, {
    users : [{
        name: 'Admin'
    }, {
        name: 'User'
    }]
}];

路由器:

// Grabs articles by categories and tags
// http://127.0.0.1:3000/api/articles/category/foo/tag/bar
router.get('/articles/category/:cat/tag/:tag', function(req, res) {
  var articles = data[0].articles;
  var q = articles.filter(function (article) {
    return article.category === req.params.cat;
    return article.tags.some(function(tagId) { return tagId === req.params.tag;});
  });
  res.json(q);
});

如果我请求 http://127.0.0.1:3000/api/articles/category/foo/tag/bar 网址，如何嵌套结果？现在，如果我这样做，tag url 将被忽略，只有 category 请求有效。

感谢您的帮助!

Answer 1

您需要重写您的 return 语句，如下所示:

return article.category === req.params.cat &&
       article.tags.some(function(tagId) {
           return tagId === req.params.tag;
       });

...使用&& operator ，否则您将仅测试第一个条件，而永远不会达到其他语句。

这是请求针对类别“foo”和标记“bar”时的测试:

var data =
[
  { articles:
    [
      { id: '0', url: 'audrey-hepburn', title: 'Audrey Hepburn', body: 'Nothing is impossible, the word itself says \'I\'m possible\'!', category: 'foo', tags: [ 'foo' ] },
      { id: '1', url: 'walt-disney', title: 'Walt Disney', body: 'You may not realize it when it happens, but a kick in the teeth may be the best thing in the world for you.', category: 'foo', tags: [ 'foo', 'bar' ] },
      { id: '2', url: 'unknown', title: 'Unknown', body: 'Even the greatest was once a beginner. Don\'t be afraid to take that first step.', category: 'bar', tags: [ 'foo', 'bar', 'baz' ] },
      { id: '3', url: 'neale-donald-walsch', title: 'Neale Donald Walsch', body: 'You are afraid to die, and you\'re afraid to live. What a way to exist.', category: 'bar', tags: [ 'foo', 'bar', 'baz' ] }
    ]
  },
  { users:
    [
      { name: 'Admin' },
      { name: 'User' }
    ]
  }
];

req = {params: {cat: 'foo', tag: 'bar'}};

var articles = data[0].articles;
var q = articles.filter(function (article) {
    return article.category === req.params.cat &&
           article.tags.some(function(tagId) { 
               return tagId === req.params.tag;
           });
});

document.write('<pre>', JSON.stringify(q, null, 4), '</pre>');

查看它与最后一个条目的匹配情况。