Assigning a new model won't update the custom field model

[JorgeSolFerreira]

I'm submitting a ... (check one with "x")

[ ] bug report => search github for a similar issue or PR before submitting
[ ] feature request
[ x] support request

Current behavior
When changing the form model by assigning it to a new object the custom fields won't update its values while the default fields will.
If the model is updated by changing a model property it will updated in the custom fields but not in the default fields.

Expected behavior
Model in custom field should update when assigning a new model.

Minimal reproduction of the problem with instructions

https://stackblitz.com/edit/ngx-formly-ui-bootstrap-2at8wq?file=app/app.component.ts

Please tell us about your environment:
Windows 10, Microsoft Visual Code, yarn

• Angular version: 5.2.7

• Browser: [all]

• Language: [all]

• Node (for AoT issues): node --version = 9.2.1

[aitboudad]

it's an expected behavior since angular doesn't track change of property values in case of object but instead it rely on it's reference.
to change a property, we often use spread operator:

    this.model = {
      ...this.model,
     email: 'email',
    }

[JorgeSolFerreira]

Is there a way to change a property twice? After changing the value for the first time the custom field loses the reference to the model.

https://stackblitz.com/edit/ngx-formly-ui-bootstrap-aj18js?embed=1&file=app/app.component.ts

[aitboudad]

that's a bug 😃

[aitboudad]

fixed in 4.4.3

[krish-ram]

Hi @aitboudad
Is it possible to have this fix in Angular 5 too? 3.x versions?

[aitboudad]

@krish-ram we currently only support one version (which is the latest one), sorry 🙏

[adrigardi90]

@krish-ram I had the same problem using Angular 5.
Every time I wanted to update the model I had to reset the formGroup too, apart from updating the required field in the model object