Add forRelation() to display related model custom fields in tables

[Copilot]

Enables displaying custom fields from related models in Filament tables. Previously, custom fields could only be displayed for the primary record model.

Changes

API Addition

• Added forRelation(string $relationName) to BaseBuilder for specifying relation path
• Returns $this for method chaining with only(), except(), etc.

State Resolution

• Column components navigate relations via data_get($record, $relationName) before resolving custom field values
• Added HasCustomFields type checking after relation navigation
• Graceful null handling when relation is unloaded

Querying

• Search: Uses nested whereHas() to query related model's custom field values
• Filters: Applies filter conditions through relation joins
• Sorting: Disabled for related fields (complexity of joining through custom_field_values)

Updated Components

• All column implementations (TextColumn, ColorColumn, DateTimeColumn, IconColumn, SingleChoiceColumn, MultiChoiceColumn)
• All filter implementations (TernaryFilter, SelectFilter)
• Factories, interfaces, and abstract base classes

Usage

// Display Member custom fields in Registration table
CustomFields::table()
    ->forModel(Member::class)
    ->forRelation('member')
    ->columns()

// In a RelationManager
public function table(Table $table): Table
{
    return $table
        ->columns([
            TextColumn::make('name'),
            ...CustomFields::table()
                ->forModel(Member::class)
                ->forRelation('member')
                ->only(['bio', 'phone'])
                ->columns(),
        ]);
}

Requirements: Related model must implement HasCustomFields and relation must be defined on primary model.

Limitation: Columns are non-sortable when using relations.

Warning

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Possibility to display custom fields on relation table</issue_title>
<issue_description>🚀 Feature Request: Support for displaying related model custom fields in relation managers

Hello 👋

I’m using Relaticle Custom Fields with Filament, and I have a scenario where I’d like to display custom fields of a related model inside a relation manager table.

Example use case

I have two models:

Registration — belongs to a Member

Member — has custom fields defined with Relaticle

In my RegistrationRelationManager, I’d like to display the custom fields of the related Member directly in the table.

Something like:

CustomFields::table()
    ->forModel(Member::class)
    ->forRelation('member')
    ->columns();

Currently, I’ve written a custom helper to make this work — it displays the fields correctly — but it also requires custom logic to make filters and sorting work, since the CustomFields columns expect the main record to be a HasCustomFields model.

💡 Feature idea

Would it be possible to extend the forModel() builder (or add a new method, e.g. forRelation('member')) so that the generated columns automatically:

Resolve the related model ($record->member) internally

Handle filters/sorting on related custom fields out of the box

This would make relation-based custom field displays much cleaner and more consistent with the rest of the API.

❤️ Thank you

Thanks for the great work on this package — it’s super powerful already!
This feature would make it even easier to integrate custom fields in more complex Filament setups.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Possibility to display custom fields on relation table #53

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