Detect changes in list

usr338

Hi
I have a form with list in it. CRUD operation can be done on list. how can I detect change in list inside container form?
i need to recalculate some field value based on values inside list.

gabriel

Hello,

List fields currently only support one operation directly: deletion. All other operations are done within separate forms, either as floating sub forms or inline.

There is currently no way to detect or react to changes in list fields. It is possible to check the backend for changes in relevant records via backend calls (eg. regularly pulling for changes) - but this is a lot of effort.

Unfortunately, as lists are not currently designed for direct data manipulation (besides bulk deletion), they are not easily usable in the way you are asking for.

usr338

Thank you for response.
So in this case, it seems that I should focus my attention on the relations to solve the problem.
May be I use triggers to recalculate my custom value on changing list records. Although it may cause inefficient performance. I also don't know if the form will refresh if one of the field values changes dynamically.
(It would be good if the REI3 also supported the postgresql generated columns to make calculation based on columns in same relation.)

gabriel

You can achieve something like "generated columns" via trigger functions. But yes, currently you need to extra attributes for this.

usr338

gabriel Thanks for response.