Required Block inside Blocks Field

The CMS Questions
1

Hey everyone,

I have a question regarding the Blocks Field. I have a blocks field that can contain a bunch of different blocks like image galleries, texts and so on. So far nothing special. But I do have one special block. That block should be present in every instance of the Blocks Field exactly once.

I wonder if there is some blueprint magic to configure the block builder in such a way or if I would have to do that myself using hooks. If it’s the latter would this strategy work? Sorry for the ugly pseudocode

page.create:after hook
	if (page contains block-field):
		specialblock = new Block('specialblock-content')
		blockfield.addBlock(specialblock)

page.update:before hook
	if (page contains block-field)
		if(page->blockfield->toBlocks()->filterBy("type", "specialblock")->count() !== 1)
			throw new Exception('block field needs to contain one specialblock')

Has anybody dealt with a similar situation and has a good solution?
Thanks for your help!

2

Where should this block appear (beginning, end)? Does it have to be visible in the Panel or just when rendering the page?

3

The blocks position isn’t fixed. In most cases it will be at position 2, but there might be exceptions. It definitely has to be visible in the panel.

4

Then using the hooks is your only option, I think. Although you will only need it at update, because at page creation you can set the special block as default: