从远程方法访问另一个环回模型的数据时返回未定义？

Question

    var loopback = require('loopback');
    var serviceOffering = loopback.getModelByType('ServiceOffering');
    var app = require('../../server/server.js');

    module.exports = function (serviceOffering) {

        serviceOffering.GetAllOfferings = function (options,category,callback) {
            var filter = JSON.parse(JSON.stringify(category));
             var arry=[];
             var getOrgFil={where:{or:[]}};
             var uniqOrList=[];

             serviceOffering.find(options,filter, function (err, result) {
     
               for(var i = 0; i < result.length; i++) {
                    var obj = result[i];
                   if (arry.indexOf(result[i]._createdBy) === -1) {
                     arry.push(obj._createdBy);
                     getOrgFil.where.or.push({UserName:obj._createdBy});
                    }
                }
                console.log(getOrgFil);
                serviceOffering.app.models.Realm.find(options,getOrgFil, function (err, resl) {
                console.log(resl);
                          return callback(null, resl); 
                });
            });
             
        };

        serviceOffering.remoteMethod(
            'GetAllOfferings', {
                http: { path: '/GetAllOfferings', verb: 'get' },
                accepts: { arg: 'category', type: 'object',http: { source: 'query' }  },
                returns: { type: 'array', root: true }
            });
    }

我正在从我的“ServiceOffering”模型的远程方法调用“Realm”模型来过滤和获取一些数据。但是我得到的响应是“未定义的”。我是环回新手，对如何调试的想法非常有限。我能够打印“结果”、“getOrgFil”，但“resp”是“未定义”。有人可以帮我理解为什么我在尝试通过远程方法获取 resp 的值时会得到“未定义”吗？

 I get output as mentioned below   

result = [ { SeriviceCategory: 'SCCER',
             AssetType: List [ 'ATCOF', 'ATHUS', 'ATMLK' ],
             ServiceType: List [ 'STQCR' ],
             Identity: null,
             _type: 'ServiceOffering',
             _createdBy: 'admin',
             _modifiedBy: 'admin',
             _createdOn: 2018-01-01T09:21:48.638Z,
             _modifiedOn: 2018-01-01T09:21:48.638Z,
             _scope: List [ 'tenantId:default' ],
             _autoScope: { tenantId: 'default' },
             _isDeleted: false,
             _version: '536c3db2-2323-4004-afb6-2a9e7995aeca',
            id: 5a49fdac28a2bd802d8206ba } ]

getOrgFil =  { where: { or: [ [Object] ] } }
stringified getOrgFil =  {"where":{"or":[{"UserName":"admin"}]}}

resl =   undefined

Realm 和 ServiceOffering 模型之间没有关系。

Answer 1

会是这样的

var app = require('../../server/server');

app.models.Realm.find(options,getOrgFil, function (err, resl) { // this instead of serviceOffering.app.models
                          return callback(null, resl); 
                });