环回 - 从另一个模型上传文件 [英] loopback - Upload files from another model

问题描述

我有两个模型:

容器:处理文件上传并在环回资源管理器中正常工作.

container: handles file uploading and works fine in loopback explorer.

爬虫:有多个属性.其中一个属性是 script，用户可以将脚本文件上传到此模型.

Crawler: have multiple properties. one of the properties is script that user can upload a script file to this model.

crawler.json:

{
  "name": "Crawler",
  "base": "PersistedModel",
  "idInjection": true,
  "options": {
    "validateUpsert": true
  },
  "properties": {
    "name": {
      "type": "string",
      "required": true
    },
    "script": {
      "type": "string"
    },
    "startCount": {
      "type": "number",
      "default": 0
    },
    "created_at": {
      "type": "date"
    },
    "updated_at": {
      "type": "date"
    }
  },
  "validations": [],
  "relations": {},
  "acls": [],
  "methods": {}
}

crawler.js:

module.exports = function(Crawler) {
  Crawler.upload = function (id,req,res,cb) {
    var container = Crawler.app.models.container;
    container.getContainers(function(er,containers){
      console.log(containers);
      if (containers.some(function(e){return e.name == 'script';})) {
        container.upload(req,res,{container:"script"},cb);
      }else{
        container.createContainer({name: "script"}, function(er,c){
          container.upload(req,res,{container: "script"},cb);
        });
      }
    });
  Crawler.remoteMethod(
    'upload',
    {
      description: 'Uploads a script',
      accepts: [
        { arg: 'id', type: 'string', http: {source: 'path'}},
        { arg: 'req', type: 'object', http: { source:'req' } },
        { arg: 'res', type: 'object', http:{ source: 'res'} }
      ],
      returns: {
        arg: 'crawler', type: 'Crawler', root: true
      },
      http: {path: '/:id/script',verb: 'post'}
    }
  );
};

但问题是当我运行POST/Crawlers/:id/script时，程序在container.upload(...) 函数并且不返回任何内容.一段时间后，请求将因超时而中止.

but the problem is when I run POST /Crawlers/:id/script, program freeze on container.upload(...) function and does not return anything. after a while, the request will be aborted due to timeout.

我在 StackOverflow 上找到了这个解决方案，但是同样的问题也发生在那里.

I found this solution on StackOverflow but the same problem happens there too.

upload 功能会发生什么?传递给 upload 的参数是否正确?有什么解决方法吗?除了loopback-component-storage，还有其他上传文件的解决方案吗?

What happens to upload function? are the parameters passed to upload correct? is there any workaround? is there any solution for uploading files other than loopback-component-storage?

(我的节点版本是 6.7.0 和环回 2)

(my node version is 6.7.0 and loopback 2)

推荐答案

首先，你应该像这样使用 body-parser 中间件:

first of all, you should use body-parser middleware like this:

"parse": {
    "body-parser#json": {},
    "body-parser#urlencoded": {"params": { "extended": true }}
}

BTW 文件以这样的数组发送:fileObject.files[null]

BTW files are sent in an array like this: fileObject.files[null]

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