Minimum length validation ListBLock

It often occurs when content editors fill in StreamField blocks with invalid content, even the form is submitted correctly. A good example is a Carousel Block. They add a CarouselBlock, but it’s not clear they have to add one ore more Slides and why the frontend seems broken. Another scenario would be adding Q/A’s for a FAQ, except you don’t want empty Categories (so at least one Q/A is required).

From this perspective it would be nice to have an optional min_length field for a ListBlock.

class CarouselSlideBlock(blocks.StructBlock):
    caption = blocks.CharBlock(max_length=64)
    image = ImageChooserBlock()


class CarouselBlock(blocks.StructBlock):
    slides = blocks.ListBlock(CarouselSlideBlock, min_length=1)

[CuriousLearner]

Hello,

Thank you for all your hard work on this. It is a much-needed feature. Is there an expected timeline for its release?

[BertrandBordage]

@thibaudcolas I confirm.