Define allowed inner blocks in register of block type

[spacedmonkey]

As detailed in #13955 there is currently no way to filter the allowed block in a inner block area. Allowed blocks are stored in a none filterable array variable. See these examples.

• Columns block
• Media & text block
• Cover

Even finding which blocks are available requires you to dig through code.

Describe the solution you'd like
The allowed inner block should be defined when the block is registered. A new children or innerBlocks field could be added when a block is registered. This would mean, that this information would be available to all parts of gutenberg. This data could be exposed in the up coming blocks api, as this data would be useful to the mobile team.

Following the naming pattern of children would match with existing parent field for child block, already found in gutenberg.

[spacedmonkey]

I spent on sometime today. What I worked on was the following.

Added a new field called innerBlocks in the block.json file for cover, media + text and columns.

In the edit function, I type to get the block type so I could read the innerBlock values and as attributes to Innerblocks. However, it didn't work, as blockType was not yet defined. I wanted to blocks.registerBlockType to make the innerblock values filterable.

Next port of call, is to make the args to innerblock type filterable. But I don't love this solution.

[chriscasper]

Any update to this?

[skorasaurus]

Any update to this?

@chriscasper this is being worked on at #58262

[jsnajdr]

Reading @spacedmonkey's notes from 5 years ago, it's notable how much Gutenberg has changed since then. Today it was a very straightforward addition, there's no problem accessing blockType.children everywhere I need it.

[skorasaurus]

This has been merged into trunk with #58262 ; documentation for this is available at https://github.com/WordPress/gutenberg/blob/b48d66e231193dc11978ce6b71f882ee93313ad9/docs/how-to-guides/block-tutorial/nested-blocks-inner-blocks.md#defining-a-children-block-relationship