TypeScript how to format array of object to array of json

Question

I have posted data like _attachments variable:

I want to prepare that data to insert as the following structure:

"_attachments": [
  {
    "container": "string",
    "fileName": "string",
    "name": "string",
    "mime": "string",
    "size": 0
  }
]

But what i have done:

for(let key in _attachments) {
  job._attachments[key]['container']  = _attachments[key]['container'];
  job._attachments[key]['fileName']  = _attachments[key]['fileName'];
  job._attachments[key]['name']      = _attachments[key]['name'];
  job._attachments[key]['mime']      = _attachments[key]['mime'];
  job._attachments[key]['size']      = _attachments[key]['size'];
}

give this error:

 Unprocessable Entity

Note: I'm using loopback.

@Aravind When i post data to api for inserting this error occurre. — jones
– jones, Commented Mar 9, 2017 at 7:30
have you checked it by setting job._attachments = _attachments directly ? As per your object keys, i think you don't need to loop through all '_attachments' — ranakrunal9
– ranakrunal9, Commented Mar 9, 2017 at 7:36

Mobasher Fasihy · Accepted Answer · 2017-03-11 09:44:14Z

4

+50

Just add this to your attachment.josn:

"id": {
  "type": "string",
  "id": true,
  "defaultFn": "uuid"
}

and no need to loop the data.

answered Mar 11, 2017 at 9:44

Mobasher Fasihy

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Comments

Bruno Grieder · Accepted Answer · 2017-03-11 10:02:38Z

3

From the screen shot _attachments seems to be an array; if that is that case you should not use for...in to iterate over it but for..of. for..in will return all enumerable properties including potentially "unwanted" ones

See the bottom of this excellent MDN resource for details (for..of is available in Typescript)

for (let index of _attachments) {
...
}

Even better, use a map

const result  = _attachments.map( att => ...)

Also the structure you map to seem identical to the original structure, why not use a direct assignment ?

answered Mar 11, 2017 at 10:02

Bruno Grieder

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Comments

wuno · Accepted Answer · 2017-03-09 08:40:42Z

0

You need to Stringify it.

Code

data = { 
    container: "Stuff"
}

var jsonString = JSON.stringify(data); 

console.log(jsonString);

Before

After

This is more what your data looks like,

edited Mar 9, 2017 at 8:40

answered Mar 9, 2017 at 8:24

wuno

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2 Comments

jones Over a year ago

Still shows the same problem when i want to insert data

jones Over a year ago

But if i upload single file, my insertion is working.

Mayank Bansal · Accepted Answer · 2017-03-15 10:29:09Z

0

JSON.stringify will help you to get object in json format and JSON.parse will convert back from JSON to object.

answered Mar 15, 2017 at 10:29

Mayank Bansal

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