missing data when using async deserializer and mobx observables

[sven-petersen]

Hello,

I am facing issues with an async deserialisation in combination with mobx observables. I have put together a small example: https://jsfiddle.net/w5rzm9t8/ . I would have expected the output to be the same in both samples. Unfortunately in the second example I am missing some values after deserialisation.

There seems to be an issue when using async deserialisation when combined with an mobx Observable. For example it starts to work when I change

const thingResolver = (v, ctx, old, cb) => {
  setTimeout(() => cb(null, v.map(id => new Thing(id))), 0);
};

to

const thingResolver = (v, ctx, old, cb) => {
 cb(null, v.map(id => new Thing(id)));
}

Can you advise if it is an error on my side, not supported, or unexpected behavior? Thanks!

[mweststrate]

This looks like a bug indeed, would you be interested in submitting a PR with unit test?

On Tue, Nov 19, 2019 at 3:39 PM Sven Petersen [email protected] wrote:

Hello,

I am facing issues with an async deserialisation in combination with mobx observables. I have put a small example: https://jsfiddle.net/dp64g9xa/4/ . I would have expected the output to be the same in both samples. Unfortunately in the second example I am missing values after deserialisation.

There seems to be an issue when using async deserialisation on an mobx Observable. For example it starts to work when I change

const thingResolver = (v, ctx, old, cb) => { setTimeout(() => cb(null, v.map(id => new Thing(id))), 0); };

to

const thingResolver = (v, ctx, old, cb) => { cb(null, v.map(id => new Thing(id))); }

Can you advise if it is an error on my side, not supported, or unexpected behavior? Thanks!

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[sven-petersen]

Hi @mweststrate , I have created the tests. Hope this helps..

[pyrogenic]

See test case fixes https://github.com/aktivalux/serializr/pull/1 — let me know if the same change fixes your actual problem as well.

[pyrogenic]

@mweststrate it seems MobX relies on field declarations (see class Person from the docs) but Node 10 (which tavis uses for this project) doesn't support them:

/home/travis/build/mobxjs/serializr/test/mobx.js:15
519        data = undefined
520             ^
521
522  SyntaxError: Unexpected token =

I can reproduce this locally using nvm to run Node 10 instead of 13 (stable):

$ nvm exec 10 yarn run coverage
. . .
/Users/josh/github/pyrogenic/serializr/test/mobx.js:15
        data = undefined
             ^

SyntaxError: Unexpected token =

$ nvm exec 13 yarn run coverage
. . .
1..226
# tests 226
# pass  226

# ok