無法使用Express NodeJS和MongoDB從API檢索數據，正在加載

Question

我正在嘗試使用Node.js，Express和MongoDB創建Rest API。我目前在我的本地主機上運行：3000。當我嘗試重新啓動並運行服務器時，我正在使用路由http://localhost:3000/drinks

我使用Postman發送HTTP請求。 https://chrome.google.com/webstore/detail/postman/fhbjgbiflinjbdggehcddcbncdddomop?hl=en

嘗試發送上述路由時，它不檢索任何信息。它只是繼續加載。

這是我第一次創建一個REST API，我不確定它爲什麼不檢索數據。下面是我的代碼。提前致謝！

server.js

var express = require('express'), 
    drink = require('./routes/drinks'); 

var app = express(); 

app.configure(function() { 
     app.use(express.logger('dev'));  /* 'default', 'short', 'tiny', 'dev' */ 
     app.use(express.bodyParser()); 
    }); 

app.get('/drinks', drink.findAll); 
app.get('/drinks/:id', drink.findById);                  

app.listen(3000); 
console.log('Listening on port 3000...'); 

drinks.js

var mongo = require('mongodb'); 

var Server = mongo.Server, 
    Db = mongo.Db, 
    BSON = mongo.BSONPure; 

var server = new Server('localhost', 27017, {auto_reconnect: true}); 
db = new Db('drinkdb', server); 

db.open(function(err, db) { 
     if(!err) { 
      console.log("Connected to 'drinkdb' database"); 
      db.collection('drinks', {strict:true}, function(err, collection) { 
        if (err) { 
         console.log("The 'drinks' collection doesn't exist. Creating it with sample data..."); 
         populateDB(); 
        } 
       }); 
     } 
    }); 

exports.findById = function(req, res) { 
    var id = req.params.id; 
    console.log('Retrieving drink: ' + id); 
    db.collection('drinks', function(err, collection) { 
      collection.findOne({'_id':new BSON.ObjectID(id)}, function(err, item) { 
        res.send(item); 
       }); 
     }); 
}; 

exports.findAll = function(req, res) { 
    db.collection('drinks', function(err, collection) { 
      collection.find().toArray(function(err, drinks) { 
        res.send(drinks); 
       }); 
     }); 
}; 
/*---------------------------------------------------------------------------------------------------------------*/ 
// Populate database with sample data -- Only used once: the first time the application is started.     
// You'd typically not find this code in a real-life app, since the database would already exist.      
var populateDB = function() { 

    var drinks = [ 
    { 
      id: "1", 
      name: "Margarita", 
      ingredients: ["Tequila","Lime juice","Triple Sec","Lime","Salt","Ice"], 
      measurements: ["2 oz","1 oz","1 oz","1","optional","optional"], 
      directions: "Shake the other ingredients with ice, then carefully pour into the glass. Served: On the roc\ 
ks; poured over ice. Optional: Salt the rim of the glass by rubbing lime on it so it sticks." 
    }, 
    { 
      id: "2", 
      name: "Strawberry Margarita", 
      ingredients: ["Tequila", "Lime juice","Triple Sec","Strawberries","Lime","Salt", "Ice"], 
      measurements: ["2 oz","1 oz", "1 oz", "3 1/2 cups", "1", "optional", "optional"], 
      directions: "Combine strawberries, ice, tequila, lime juice, and triple sec in a blender, and process unt\ 
il the mixture is smooth. Carefully pour into the glass. Served: On the rocks; poured over ice. Optional: Salt the ri\ 
m of the glass by rubbing lime on it so it sticks." 
    }]; 

    db.collection('drinks', function(err, collection) { 
      collection.insert(drinks, {safe:true}, function(err, result) {}); 
     }); 
}; 

警告是：

express deprecated app.configure: Check app.get('env') in an if statement server.js:6:5 
connect deprecated multipart: use parser (multiparty, busboy, formidable) npm module instead node_modules/express/node_modules/connect/lib/middleware/bodyParser.js:56:20 
connect deprecated limit: Restrict request size at location of read node_modules/express/node_modules/connect/lib/middleware/multipart.js:86:15 

Answer 1

你的模型（drinks.js）接受兩個參數（REQ & RES），但在你的路線上，你不會傳入任何參數。

嘗試以下操作：

app.get('/drinks', function(req, res) { 
    drink.findAll(req, res); 
}); 

app.get('/drinks/:id', function(req, res){ 
    drink.findById(req, res); 
}); 

或者，你可以實現一個基於回調結構相同：

server.js

...

app.get('/drinks', function(req, res) { 
    drink.findAll(function(err, drinks){ 
     res.send(drinks) 
    }); 
}); 

。 ..

drinks.js

...（所需的錯誤處理）

exports.findAll = function(callback) { 
    db.collection('drinks', function(err, collection) { 
      collection.find().toArray(function(err, drinks) { 
        callback(err, drinks) 
       }); 
     }); 
}; 

...

Answer 2

我認爲阿什利是在正確的軌道上。但是，爲了更清楚問題出在哪裏發生了嘗試使用此作爲指南： http://expressjs.com/en/guide/routing.html

app.get('/drinks', function (req, res) { 
    drink.findAll(req, res); 
}); 

然後你就可以添加此調用之間，並在你的函數findAll登錄。