up

app/Filament/Resources/TelaResource.php

@@ -44,7 +44,7 @@ class TelaResource extends Resource
             ColorPicker::make('color')->default('#000000'),
 
             Select::make('proveedor_id')
-                ->relationship('proveedor', 'nombre', fn(\Illuminate\Database\Eloquent\Builder $q) => $q->where('categoria', 'telas'))
+                ->options(fn() => \App\Models\Proveedor::where('categoria', 'telas')->pluck('nombre', 'id')->toArray())
                 ->searchable()
                 ->preload()
                 ->required(),

scripts/test_proveedor_query.php

@@ -0,0 +1,18 @@
+<?php
+require __DIR__ . '/../vendor/autoload.php';
+$app = require_once __DIR__ . '/../bootstrap/app.php';
+$kernel = $app->make(Illuminate\Contracts\Console\Kernel::class);
+$kernel->bootstrap();
+
+use App\Models\Proveedor;
+
+try {
+    $rows = Proveedor::where('categoria', 'telas')->get();
+    echo "Found " . $rows->count() . " proveedores with categoria=telas\n";
+    foreach ($rows as $r) {
+        echo "- {$r->id}: {$r->nombre} ({$r->categoria})\n";
+    }
+} catch (Throwable $e) {
+    echo "Error: " . get_class($e) . " - " . $e->getMessage() . "\n";
+    echo $e->getTraceAsString();
+}