App gets stuck if optionfield becomes invalid in dynamic array

Need help? Ask here!
1

Eventhough a dynamic array isn’t ment to contain loads of rows. Due to the lack of multi select list in Table we could have a Dynamic Array of 100+ rows.
If there is an OptoinField of which the stored data is invalid with the values the platform gets stuck or might even crash:

image

The amount of warnings go through the roof which prevent the site from operating.

To reproduce:
Create a set params button to fill a dynamic array with values stored. Change the option list so the data becomes invalid.
Wait for the site to get stuck.

2

Hi Johan,

thanks for bringing this up, we are diving into it!

Will let you know when we have a solution.

3

Hi Johan,

We have tried to reproduce the error, see the code below.

“Unfortunately” the app doesn’t break (even with 3000 items in the dynamic array. You do get indeed a lot of error messages but the editor remains working (getting less responsive off course). With 200 items it’s still very responsive.

Could you provide more information, or ideally a code snippet with which we can reproduce this? How many other parameters do you have in your dynamic array and parametrization?

import viktor as vkt
import random

def get_options(params, **kwargs):
        # Dynamically get options from the TextField
        return params.options.split(',') if params.options else []

class Parametrization(vkt.Parametrization):
    options = vkt.TextField("Options (comma-separated)", default="A,B,C,D,E")

    fill_button = vkt.SetParamsButton("Fill Array", method="fill_array")
    change_options_button = vkt.SetParamsButton("Change Options", method="change_options")
    
    items = vkt.DynamicArray("Items")
    items.value = vkt.OptionField("Value", options=get_options)
    
    
class Controller(vkt.Controller):
    label = "Error Reproduction App"
    parametrization = Parametrization

    def fill_array(self, params, **kwargs):
        # Generate rows with random values from current options
        current_options = get_options(params)
        new_items = [{"value": random.choice(current_options)} for _ in range(3000)]
        return vkt.SetParamsResult({"items": new_items})

    def change_options(self, params, **kwargs):
        # Change the options to make stored data potentially invalid
        new_options = "X,Y,Z"
        return vkt.SetParamsResult({"options": new_options})
4

Okay, maybe due to our parametrization being bigger and maybe as we use that input for new OptionLists also.

Maybe just a clear all wanings button instead :slight_smile: