Javascript:具有多个查询参数的嵌套JSON api请求

时间:2016-02-13 12:04:09

标签: javascript json node.js api express

我尝试为我的下一个网站制作API,但我很难在快递应用中使用相同的网址获取多个查询结果。

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,我如何嵌套结果?现在,如果我执行此操作,则会忽略tag个网址,只有category个请求生效。

感谢您的帮助!

2 个答案:

答案 0 :(得分:1)

问题在这里>>

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

第一个return语句将停止函数内的进一步操作 所以你需要if ... elsecase或帮助函数

答案 1 :(得分:1)

您需要重写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,否则你只会在第一个条件下进行测试,永远不会到达另一个语句。

如果请求属于类别&f; foo'并标记' bar':



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>');
&#13;
&#13;
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查看它与最后一个条目的匹配程度。