Question

我正在尝试将两个对象组合在一起并将它们保存到集合中。但由于我是Node.js / Express的新手，我觉得我错过了一些东西。欢迎提出所有建议！

提前获得宝贵的时间。

这是我一直困惑但不的工作：

app.post('/:collection', function(req, res) {
    var object = req.body;
    var collection = req.params.collection;
    geocoder.geocode(req.body.address.street + req.body.address.no + req.body.address.zip + req.body.address.city, function(req, res) {
    var gpslocation = ({"loc": [res[0].longitude, res[0].latitude]});
    mergedObject = JSON.parse((JSON.stringify(object) + JSON.stringify(gpslocation)).replace(/}{/g,","))
    console.log(mergedObject);
    });
    collectionDriver.save(collection, object, function(error,docs) {
          if (error) { res.send(400, error); }
          else { res.send(201, docs);} //B
   });
});

输出（console.log）但是实际保存工作但没有附加经度/纬度：

{ cat: 'Electrician6',
name: { first: 'John', last: 'Pipe', picture_ID: '23872' },
created_at: '2015-05-16T14:05:23.431Z',
_id: '55574ea3435c2d9c24d21572',
loc: [ 4.7261822, 50.9635574 ] }

但是当我编辑它时：

app.post('/:collection', function(req, res) { //A
    var object = req.body;
    var collection = req.params.collection;
    geocoder.geocode(req.body.address.street + req.body.address.no + req.body.address.zip + req.body.address.city, function(req, res) {
    var gpslocation = ({"loc": [res[0].longitude, res[0].latitude]});
    mergedObject = JSON.parse((JSON.stringify(object) + JSON.stringify(gpslocation)).replace(/}{/g,","))
    console.log(mergedObject);
    });
    collectionDriver.save(collection, mergedObject, function(error,docs) {
          if (error) { res.send(400, error); }
          else { res.send(201, docs);} //B
   });
});

输出：

ReferenceError: mergedObject is not defined
    at app.put.params (/app/testapp/index.js:92:39)
    at callbacks (/app/testapp/node_modules/express/lib/router/index.js:161:37)
    at param (/app/testapp/node_modules/express/lib/router/index.js:135:11)
    at param (/app/testapp/node_modules/express/lib/router/index.js:132:11)
    at pass (/app/testapp/node_modules/express/lib/router/index.js:142:5)
    at Router._dispatch (/app/testapp/node_modules/express/lib/router/index.js:170:5)
    at Object.router (/app/testapp/node_modules/express/lib/router/index.js:33:10)
    at next (/app/testapp/node_modules/express/node_modules/connect/lib/proto.js:190:15)
    at Object.staticMiddleware [as handle] (/app/testapp/node_modules/express/node_modules/connect/lib/middleware/static.js:55:61)
    at next (/app/testapp/node_modules/express/node_modules/connect/lib/proto.js:190:15)
    { cat: 'Electrician6',
    name: { first: 'John', last: 'Pipe', picture_ID: '23872' },
    loc: [ 4.7261822, 50.9635574 ] }

Answer 1

要合并，请使用lodash merge function，它可以解决问题

Answer 2

没有理由合并两个对象。只需添加＆＃34; loc＆＃34;属性到原始对象。你还需要在回调中调用collectionDriver.save，这样只有在geocoder.geocode完成后才会发生。

app.post('/:collection', function(req, response) {
    var object = req.body;
    var collection = req.params.collection;
    geocoder.geocode(object.address.street + object.address.no + object.address.zip + object.address.city, function(req, res) {
      object.loc = [res[0].longitude, res[0].latitude];
      console.log(object);
      collectionDriver.save(collection, object, function(error,docs) {
        if (error) { response.send(400, error); }
        else { response.send(201, docs);}
      });
    });
});

尝试组合2个变量但获取：mergedObject未定义

2 个答案: