javascript - 如何在我的 Node.js Web 服务中包含另一个参数？

Question

抱歉，如果这是一个乏味的问题，我才刚刚开始了解 JS/node.js 如何处理 post/get 消息。

我正在编写一个 Web 服务，根据用户的纬度/经度和距离从 mongodb 数据库查询数据。我在前端代码中编写了以下函数:

// Take query parameters and incorporate into a JSON queryBody
    $scope.queryUsersFromLast24Hours = function(){

        // Assemble Query Body
        queryBody = {
            longitude: parseFloat($scope.formData.longitude),
            latitude: parseFloat($scope.formData.latitude),
            distance: parseFloat($scope.formData.distance)
        };


        // Post the queryBody to the /query POST route to retrieve the filtered results
        $http.post('/queryUsersFromLast24Hours', queryBody)

            // Store the filtered results in queryResults
            .success(function(queryResults){

                console.log(JSON.stringify(queryBody));

                // Pass the filtered results to the Google Map Service and refresh the map
                gservice.refresh(queryBody.latitude, queryBody.longitude, queryResults);

                // Count the number of records retrieved for the panel-footer
                $scope.queryCount = queryResults.length;
            })
            .error(function(queryResults){
                console.log('Error ' + queryResults);
            })
    };

它从我的支持代码中调用方法/queryUsersFromLast24Hours，如下所示:

// Retrieves JSON records for all users who meet a certain set of query conditions
    app.post('/queryUsersFromLast24Hours/', function(req, res){

        // Grab all of the query parameters from the body.
        var lat             = req.body.latitude;
        var long            = req.body.longitude;
        var distance        = req.body.distance;
        var dateNow           = new Date(); //right now



        // Opens a generic Mongoose Query. Depending on the post body we will...
        var query = User.find({});

        // ...include filter by Max Distance (converting miles to meters)
        if(distance){

            // Using MongoDB's geospatial querying features. (Note how coordinates are set [long, lat]
            query = query.where('location').near({ center: {type: 'Point', coordinates: [long, lat]},

                // Converting meters to miles. Specifying spherical geometry (for globe)
                maxDistance: distance * 1609.34, spherical: true});
        }
            console.log(dateNow);
            dateNow.setHours(dateNow.getHours()-24); //24 hours from now
            console.log(dateNow);
            query = query.where('created_at').gte(dateNow); //gte - greater then equal


        // Execute Query and Return the Query Results
        query.exec(function(err, users){
            if(err)
                res.send(err);

            // If no errors, respond with a JSON of all users that meet the criteria
            res.json(users);
        });
    });

但是现在，如果我想让它更加通用，返回的数据不是过去24小时的数据，而是用户给出的最后xx小时的数据，我应该如何修改？

我想创建一个 Web 服务，它不仅可以获取纬度/经度/距离数据，还可以获取小时数作为 POST 消息，并返回包含正确数据的 json。那么我应该如何修改我的前端/后端代码以包含此更改？

另外，现在我从 GUI 中调用它，如下所示:

<button type="button" class="btn btn-danger" ng-click="queryUsersFromLast24Hours()">Show data from last hour</button>

那么我如何修改它以传递将包含在后端查询搜索中的特定小时数？

非常感谢您的帮助!

Answer 1

快速回答:

前端:

// Take query parameters and incorporate into a JSON queryBody
$scope.queryUsers = function(){

    // Assemble Query Body
    queryBody = {
        longitude: parseFloat($scope.formData.longitude),
        latitude: parseFloat($scope.formData.latitude),
        distance: parseFloat($scope.formData.distance)
        hours : Number($scope.formData.hours)
    };


    // Post the queryBody to the /query POST route to retrieve the filtered results
    $http.post('/queryUsers', queryBody)

        // Store the filtered results in queryResults
        .success(function(queryResults){

            console.log(JSON.stringify(queryBody));

            // Pass the filtered results to the Google Map Service and refresh the map
            gservice.refresh(queryBody.latitude, queryBody.longitude, queryResults);

            // Count the number of records retrieved for the panel-footer
            $scope.queryCount = queryResults.length;
        })
        .error(function(queryResults){
            console.log('Error ' + queryResults);
        })
};

后端:

// Retrieves JSON records for all users who meet a certain set of query conditions
app.post('/queryUsers/', function(req, res){

    // Grab all of the query parameters from the body.
    var lat             = req.body.latitude;
    var long            = req.body.longitude;
    var distance        = req.body.distance;
    var hours           = req.body.hours
    var dateNow         = new Date(); //right now



    // Opens a generic Mongoose Query. Depending on the post body we will...
    var query = User.find({});

    // ...include filter by Max Distance (converting miles to meters)
    if(distance){

        // Using MongoDB's geospatial querying features. (Note how coordinates are set [long, lat]
        query = query.where('location').near({ center: {type: 'Point', coordinates: [long, lat]},

            // Converting meters to miles. Specifying spherical geometry (for globe)
            maxDistance: distance * 1609.34, spherical: true});
    }
        console.log(dateNow);
        dateNow.setHours(dateNow.getHours()- hours); // XX hours from now
        console.log(dateNow);
        query = query.where('created_at').gte(dateNow); //gte - greater then equal


    // Execute Query and Return the Query Results
    query.exec(function(err, users){
        if(err)
            res.send(err);

        // If no errors, respond with a JSON of all users that meet the criteria
        res.json(users);
    });
});

很抱歉，如果我误解了您的问题，但我只是想给您一些提示，此查询看起来像 GET 而不是 POST，您可以使用查询参数或路径参数。