Nested Relationship Forms

[falterkofler]

I have the following table structure

• Order
• OrderPart
• OrderPost

An order consists of several orderParts and each orderPart has several OrderPosts

I would like to create a fully laid out relation within the same form using relationship with subfields

I have tried something like this in my OrderCrudController.php:

CRUD::field([
        'name'          => 'parts',
        'type'          => "relationship",
        'subfields'   => [
            [
                'name' => 'supplier',
                'type' => 'relationship',
                'attribute' => 'name',
                'label' => 'Lieferant',
            ],
            [
                'name' => 'posts',
                'type' => 'relationship',
                'subfields' => [
                    [
                        'name' => 'product',
                        'type' => 'relationship',
                        'attribute' => 'name',
                        'label' => 'Produkt',
                    ],
                    [
                        'name' => 'amount',
                        'type' => 'number',
                        'label' => 'Menge',
                    ],
                   
                ],
            ],
        ]
    ]);

As soon as I add another 'type' => 'relationship' with 'subfields' I get Javascript errors and it is not working.

Can this be done or could it be done in the future maybe? :)

[backpack-ai-bot[bot]]

Based on the knowledge sources, it appears that nesting relationship fields with subfields inside other relationship fields with subfields is not currently supported in Backpack.

The documentation and GitHub issues show that Backpack supports using the relationship field type with subfields for managing related entries in the same form, but there's no indication that these can be nested multiple levels deep as you're trying to do.

From the Backpack documentation on relationship fields, we can see that you can use the relationship field with subfields to manage related entries (like your OrderParts) within the same form. However, there's no mention of nesting these structures.

The GitHub issues also discuss various aspects of the relationship field with subfields, but none of them demonstrate or mention the ability to nest relationship fields with their own subfields inside other relationship fields.

When you try to nest a relationship field with subfields inside another relationship field's subfields, you're encountering JavaScript errors because this particular structure isn't supported in the current implementation.

For your specific case, you might need to consider alternative approaches:

1. Create separate forms/interfaces for each level of your data structure
2. Use a flatter structure in your form design
3. Consider using a custom field type that could handle this specific nested structure

If this feature is important for your use case, you might want to submit a feature request to the Backpack GitHub repository, as it could be a valuable addition for complex data structures like yours.

ℹ️ Please note our AI Bot does not reply to follow-ups, this will be the only AI answer in this thread. If the AI helped you find the answer, please mark it as answered or write details below so it can learn. Then close the conversation. If not, please give more information for when a human reads this. ℹ️

Relevant sources:

Fields|Manage related entries in the same form (create, update, delete) Part 1
Github Issue (closed): [Feature Request] subcolumns on relationship column, just like we have subfields for the relationship field
Github Issue (closed): [Feature Request] Add InlineCreate to relationship field when there are subfields
Github Issue (closed): [4.2][Bug] Relationships don't get saved for subfields
Github Issue (closed): [v5][Summary] Not all fields work as subfields inside relationship
Github Issue (closed): CRUD : Adding Multiple Child Records (1-n relationships) on related CRUD form?
Github Issue (closed): [Bug] Error when trying to save a subfield in a relationship field
FAQs for CRUDs|What field should I use for a relationship? Part 1
Github Issue (closed): [Feature or Documentation Request] - CrudField JavaScript Library with relationship/subfield fields