Loopback -取回函数而不是值
Loopback -取回函数而不是值
提问于 2017-04-25 19:31:57
对于一些端点，我在调用时会得到一个函数，而不是实际的值(末尾的代码)。看起来它只出现在我的患者模型中的嵌套端点上。
例如，localhost:3000/api/Patients/{id}/MeasDescPatRels
然而，这样做很好：localhost:3000/api/Patients/{id}/MeasuredDataPoints
在我的webapp中，这并不是真正的问题，显然，返回的函数只是由JS调用，并为我提供了正确的数据。然而，我有一个android应用程序调用完全相同的端点。
编辑:我也不确定这种行为是什么时候开始的。有时就在创建患者模型之后，但有时它会工作几个小时，甚至几天。
返回函数：
function (condOrRefresh, options, cb) {
if (arguments.length === 0) {
if (typeof f.value === 'function') {
return f.value(self);
} else if (self.__cachedRelations) {
return self.__cachedRelations[name];
}
} else {
if (typeof condOrRefresh === 'function' &&
options === undefined && cb === undefined) {
// customer.orders(cb)
cb = condOrRefresh;
options = {};
condOrRefresh = undefined;
} else if (typeof options === 'function' && cb === undefined) {
// customer.orders(condOrRefresh, cb);
cb = options;
options = {};
}
options = options || {};
// Check if there is a through model
// see https://github.com/strongloop/loopback/issues/1076
if (f._scope.collect &&
condOrRefresh !== null && typeof condOrRefresh === 'object') {
//extract the paging filters to the through model
['limit', 'offset', 'skip', 'order'].forEach(function(pagerFilter) {
if (typeof(condOrRefresh[pagerFilter]) !== 'undefined') {
f._scope[pagerFilter] = condOrRefresh[pagerFilter];
delete condOrRefresh[pagerFilter];
}
});
// Adjust the include so that the condition will be applied to
// the target model
f._scope.include = {
relation: f._scope.collect,
scope: condOrRefresh,
};
condOrRefresh = {};
}
return definition.related(self, f._scope, condOrRefresh, options, cb);
}
}MeasDescPatRels模型(不工作)：
{
"name": "MeasDescPatRel",
"base": "PersistedModel",
"strict": false,
"idInjection": false,
"options": {
"validateUpsert": true
},
"properties": {
"reminderData": {
"type": "object"
},
"alarmData": {
"type": "object"
}
},
"validations": [],
"relations": {
"patient": {
"type": "belongsTo",
"model": "Patient",
"foreignKey": "patientId"
},
"measurementDescription": {
"type": "belongsTo",
"model": "MeasurementDescription",
"foreignKey": ""
}
},
"acls": [
{
"accessType": "*",
"principalType": "ROLE",
"principalId": "$everyone",
"permission": "ALLOW"
},
{
"accessType": "WRITE",
"principalType": "ROLE",
"principalId": "$everyone",
"permission": "ALLOW"
}
],
"methods": {}
}HomeGateway模型(不工作)：
{
"name": "HomeGateWay",
"base": "PersistedModel",
"idInjection": true,
"options": {
"validateUpsert": true
},
"properties": {
"model": {
"type": "string",
"required": true
},
"version": {
"type": "string",
"required": true
},
"onlineStatus": {
"type": "boolean",
"required": true
},
"macAdress": {
"type": "string",
"id": true,
"required": true
}
},
"validations": [],
"relations": {
"patient": {
"type": "belongsTo",
"model": "Patient",
"foreignKey": ""
}
},
"acls": [
{
"accessType": "*",
"principalType": "ROLE",
"principalId": "$everyone",
"permission": "ALLOW"
}
],
"methods": {}
}MeasuredDataPoint模型(工作中)：
{
"name": "MeasuredDataPoint",
"base": "PersistedModel",
"strict": false,
"idInjection": true,
"options": {
"validateUpsert": true
},
"properties": {
"created": {
"type": "date",
"required": false
},
"timestamp": {
"type": "date",
"required": false
},
"lastUpdated": {
"type": "date",
"required": false
}
},
"validations": [],
"relations": {
"measurementDescription": {
"type": "belongsTo",
"model": "MeasurementDescription",
"foreignKey": ""
},
"patient": {
"type": "belongsTo",
"model": "Patient",
"foreignKey": "patientId"
}
},
"acls": [
{
"accessType": "*",
"principalType": "ROLE",
"principalId": "$everyone",
"permission": "ALLOW"
}
],
"methods": {}
}回答 1
Stack Overflow用户
发布于 2018-07-08 03:05:07
我重现了这个错误：
SomeModel.find({ where: { userId: userId }, include : ['otherModel'] }, (err, response) => {
var someArray = response;
for (var x in someArray) {
var otherModel = someArray[x].otherModel;
console.log(otherModel);
}
});otherModel的控制台输出为：
function (condOrRefresh, options, cb) {
if (arguments.length === 0) {
if (typeof f.value === 'function') {
return f.value(self);
} else if (self.__cachedRelations) {
return self.__cachedRelations[name];
}
} else {
const condOrRefreshIsCallBack = typeof condOrRefresh === 'function' &&
options === undefined &&
cb === undefined;
if (condOrRefreshIsCallBack) {
// customer.orders(cb)
cb = condOrRefresh;
options = {};
condOrRefresh = undefined;
} else if (typeof options === 'function' && cb === undefined) {
// customer.orders(condOrRefresh, cb);
cb = options;
options = {};
}
options = options || {};
// Check if there is a through model
// see https://github.com/strongloop/loopback/issues/1076
if (f._scope.collect &&
condOrRefresh !== null && typeof condOrRefresh === 'object') {
f._scope.include = {
relation: f._scope.collect,
scope: condOrRefresh,
};
condOrRefresh = {};
}
return definition.related(self, f._scope, condOrRefresh, options, cb);
}
}因为otherModel的输出是一个函数。我尝试使用：var otherModel = batchArray[x].otherModel()作为函数而不是var otherModel = batchArray[x].otherModel来调用它。它会给出所需的输出。
此行为解释了include过滤器返回模型的一个函数，该函数被执行并作为对象传递到前端，但在后端它需要作为一个函数调用。
我仍然在试图弄清楚它如何将所需的对象返回到前端，以及如何将函数返回到后端。任何线索都会有帮助。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/43609499
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