Move the primary allocation when it is removed from a server

tests/Filament/Admin/ServerCrudTest.php

@@ -3,6 +3,7 @@
 use App\Enums\RolePermissionModels;
 use App\Filament\Admin\Resources\Servers\Pages\CreateServer;
 use App\Filament\Admin\Resources\Servers\Pages\EditServer;
+use App\Filament\Admin\Resources\Servers\RelationManagers\AllocationsRelationManager;
 use App\Models\Allocation;
 use App\Models\Egg;
 use App\Models\Node;
@@ -88,6 +89,45 @@ it('can delete a server', function () {
     $this->assertDatabaseMissing('servers', ['id' => $server->id]);
 });
 
+it('moves the primary allocation when it is removed from a server', function () {
+    $server = createServerModel();
+    $primary = $server->allocation;
+    $other = Allocation::factory()->forServer($server)->create();
+
+    livewire(AllocationsRelationManager::class, ['ownerRecord' => $server, 'pageClass' => EditServer::class])
+        ->callAction(TestAction::make('dissociate')->table($primary));
+
+    expect($primary->refresh()->server_id)->toBeNull()
+        ->and($server->refresh()->allocation_id)->toBe($other->id);
+});
+
+it('clears the primary allocation when the last allocation is removed from a server', function () {
+    $server = createServerModel();
+    $primary = $server->allocation;
+
+    livewire(AllocationsRelationManager::class, ['ownerRecord' => $server, 'pageClass' => EditServer::class])
+        ->callAction(TestAction::make('dissociate')->table($primary));
+
+    $server->refresh();
+
+    expect($server->allocation_id)->toBeNull()
+        ->and(json_encode($server->getAllocationMappings()))->toBe('{"":[]}');
+});
+
+it('moves the primary allocation when it is removed from a server in bulk', function () {
+    $server = createServerModel();
+    $primary = $server->allocation;
+    [$removed, $kept] = Allocation::factory()->count(2)->forServer($server)->create();
+
+    livewire(AllocationsRelationManager::class, ['ownerRecord' => $server, 'pageClass' => EditServer::class])
+        ->selectTableRecords([$primary->id, $removed->id])
+        ->callAction(TestAction::make('dissociate')->table()->bulk());
+
+    expect($primary->refresh()->server_id)->toBeNull()
+        ->and($removed->refresh()->server_id)->toBeNull()
+        ->and($server->refresh()->allocation_id)->toBe($kept->id);
+});
+
 it('non root admin without permission cannot create servers', function () {
     $role = Role::factory()->create(['name' => 'Egg Viewer', 'guard_name' => 'web']);
     // Egg permission is on purpose, we check the wrong permissions.