Certainly! You're right: with a self-referential many-to-many relationship, a single "relatedContracts" relation will only return one side of the association based on how you set up the relationship. To show both sides (i.e., treat the relation as bidirectional), you have a couple of options.
Solution Overview:
- Define two relationships on your
Contractmodel: one for each direction. - Create a query that unions both, so you can easily fetch all "related" contracts regardless of the direction.
- For Filament, you can use a custom query in your
RelationManagerto fetch this union.
1. Setup on the Model
Assuming your pivot table is named contract_contract, with contract_id and related_contract_id fields:
class Contract extends Model
{
public function relatedContractsA()
{
return $this->belongsToMany(
Contract::class,
'contract_contract',
'contract_id',
'related_contract_id'
);
}
public function relatedContractsB()
{
return $this->belongsToMany(
Contract::class,
'contract_contract',
'related_contract_id',
'contract_id'
);
}
// Unified method to get all related contracts both ways
public function getAllRelatedContractsAttribute()
{
return $this->relatedContractsA->merge($this->relatedContractsB);
}
}
2. Filament Custom Relation Query
In your RelatedContractsRelationManager.php, instead of using the default relatedContractsA() or relatedContractsB(), you can override the query to return a union:
use Filament\Resources\RelationManagers\RelationManager;
class RelatedContractsRelationManager extends RelationManager
{
// ...
public static function getRelationshipQuery($ownerRecord)
{
$id = $ownerRecord->id;
// Get contracts where this contract is the "contract_id"
$a = \App\Models\Contract::query()
->whereHas('relatedContractsA', function($q) use ($id) {
$q->where('contracts.id', $id);
});
// Get contracts where this contract is the "related_contract_id"
$b = \App\Models\Contract::query()
->whereHas('relatedContractsB', function($q) use ($id) {
$q->where('contracts.id', $id);
});
// Union the two queries
return $a->union($b);
}
}
Note: Filament expects Eloquent Relations in relation managers, so you may need to use a custom widget, table, or override the resource's related list display if you can't directly inject a union in the RelationManager. Alternatively, you might create a view accessor and list contracts via a Card or Table on the contract's detail page, using $record->all_related_contracts.
3. Simpler Approach: Accessor + Custom Table
Instead of using a Relation Manager, you can display related contracts like this in your Filament resource:
// In your ContractResource/Pages/ViewContract.php
use Filament\Resources\Pages\Page;
use Filament\Tables;
use Filament\Tables\Columns\TextColumn;
class ViewContract extends Page implements Tables\Contracts\HasTable
{
use Tables\Concerns\InteractsWithTable;
// ...
protected function getTableQuery()
{
// $this->record is your current Contract model instance
$ids = $this->record->all_related_contracts->pluck('id')->unique();
return \App\Models\Contract::query()->whereIn('id', $ids);
}
protected function getTableColumns(): array
{
return [
TextColumn::make('name'),
// ... other columns
];
}
}
Summary
- Define both "directions" of the relationship.
- Use an accessor (
all_related_contracts) to merge both. - Display related contracts (using this accessor) in Filament via a table or a custom widget/page.
If RelationManager is a must:
You will need a custom RelationManager that can work with that unioned query, or consider using Polymorphic Relation Managers with custom queries as shown above.
Let me know if you need a more specific example for your Filament resource/page or further clarification!