Alireza Alireza - 1 month ago 16
Node.js Question

loopback - Upload files from another model

I have two models:

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

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'}
}
);
};


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.

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

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
?

(my node version is 6.7.0 and loopback 2)

Answer

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

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

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