Question

我有一个Angular应用程序需要能够从MongoDB集合中获取构造数据。我有两个来自flConstruct的HTTP API调用（“query”和“get”）来从服务器请求数据。 “查询”调用返回所有数据，似乎工作正常。当我尝试仅检索其中一个构造的数据时，我收到错误。在服务器端，我有一个route.js，它应该将调用路由到我的constructs.js脚本中的正确函数。 “get”调用应该路由到construct.getConstructById，但似乎是路由到constructs.getConstructs。谁能看到我可能做错了什么？

我得到的错误信息是“flCachedConstructs.queryID（...）。$ promise is undefined”但我认为这是一个误导性的消息，因为检索的（集合）与预期的不同（单个文档）。

//flCachedConstructs

angular.module('app').factory('flCachedConstructs', function(flConstruct,$http, $q) {
var constructList = null;  // temporarily set to null for testing purposes
var construct;

return {
    queryID: function(constructId) {
        console.log("flCachedConstruct - queryID function by ID - start");
        console.log("flCachedConstruct - queryID function by ID - parameter = constructId " + constructId);
        var deferred = $q.defer();
        flConstruct.get(constructId, function(data) {
            if (data) {
                deferred.resolve(data);
            }
            else {
                deferred.reject("Error getting Construct");
            }
        });
        return deferred.promise;
    },
    queryAll: function() {
        console.log("flCachedConstruct - queryAll function, no parameters - start");
        if(!constructList || constructList == null) {
            console.log("flCachedConstruct - querAlly function - if constructList is null or does not exits");
            constructList = flConstruct.query();
        }else
        {
            console.log("flCachedConstruct - queryAll function - if constructList is not null and does exits");
            console.log("constructList = " + constructList );
        }

        return constructList;
    },
    empty: function() {
        console.log("flCachedConstruct - empty function - start");
        constructList = null;
        console.log("flCachedConstruct - empty function - after setting constructList to null");
        return constructList;
    }

}
})


//flConstruct.js

angular.module('app').factory('flConstruct',function($resource){
var ConstructResource = $resource('/api/constructs/:id', {_id: "@id"}, {
    query: { method: 'GET', isArray: true },
    get: { method: 'GET', params: {id: '@id'} , isArray: false },
    create: { method: 'POST'},
    update: { method: 'PUT' },
    delete: { method: 'DELETE', params: {id: '@id'}}
});

return ConstructResource;
});


//routes.js

var constructs = require('../controllers/constructs'),

module.exports = function(app){


app.get('/api/constructs', constructs.getConstructs);
app.get('/api/constructs/:id', constructs.getConstructById);

app.post('/api/constructs', constructs.createConstruct);
app.put('/api/constructs', constructs.updateConstruct);
app.delete('/api/constructs/:id', constructs.deleteConstruct);


app.all('/api/*', function(req,res){
    res.sendStatus(404);
});

app.get('*', function ( req, res) {
    res.render('index', {
        bootstrappedUser: req.user
    });
});
}



// construct.js

var Construct = require('mongoose').model('Construct');

exports.getConstructs = function(req,res){
var constructData = req.body;
console.log("Get - constructs.getConstructs");
console.log("constructData.id " + constructData.id);
console.log("constructData " + constructData);
console.log("req.params.id " + req.params.id);
console.log("req.query.id " + req.query.id);
Construct.find({}).exec(function(err,collection){
    if (err){
        console.log("Error - No Construct Retrieved");
    }else
    {
        console.log("No Error - Construct Data Retrieved");
    }
    //console.log(collection);
    res.send(collection);
})
};

exports.getConstructById = function(req,res) {
console.log("Get - constructs.getConstructById")
console.log("req.params._id " + req.params._id)
console.log("req.query._id " + req.query._id)
Construct.findOne({_id:req.params.id}).exec(function(err,construct){
    if (err){
        console.log("Error - No Construct Retrieved");
    }else
    {
        console.log("No Error - Construct Data Retrieved");
    }
    res.send(construct);
})
};

Answer 1

我发现了自己的错误。它都在Angular代码中。在flCachedConstruct.js中对get进行的调用没有正确定义要传递的参数。我需要包含参数名称“id”以及参数值constructID。此函数调用中的“id”与我在flConstruct.js中调用的参数相匹配。

flConstruct.get({id: constructId }, function(data) {

Angular HTTP API获取请求未被路由到正确的Express服务器功能

1 个答案: