Transform nested relationa

Author: pascalbaljet

app/app/Http/Controllers/FormComponentsController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers;
 
 use App\Models\Dummy;
+use App\Models\Project;
 use Illuminate\Http\Request;
 use Illuminate\Support\Arr;
 use Illuminate\Support\Fluent;
@@ -203,6 +204,15 @@ public function defaultUnguarded()
         ]]);
     }
 
+    public function relation()
+    {
+        $project = Project::first();
+
+        return view('form.components.relation', [
+            'project' => $project,
+        ]);
+    }
+
     public function submit(Request $request)
     {
         $request->validate([

app/resources/views/form/components/relation.blade.php

@@ -0,0 +1,14 @@
+@extends('layout')
+
+@section('content')
+
+FormComponents
+
+<div class="max-w-sm mx-auto px-4">
+    <x-splade-form class="space-y-4" :default="$project">
+        <x-splade-input dusk="name" name="name" label="Name" />
+        <x-splade-input dusk="city" name="organization.address.city" label="City" />
+    </x-splade-form>
+</div>
+
+@endsection

app/routes/web.php

@@ -130,6 +130,7 @@
     Route::post('form/components', [FormComponentsController::class, 'submit'])->name('form.components.submit');
     Route::get('form/components/submitValue/{approved?}', [FormComponentsController::class, 'submitValue'])->name('form.components.submitValue');
     Route::post('form/components/submitValue/{approved?}', [FormComponentsController::class, 'submitValueSubmit'])->name('form.components.submitValueSubmit');
+    Route::get('form/components/relation', [FormComponentsController::class, 'relation'])->name('form.components.relation');
 
     Route::get('form/relations/belongsToMany', [FormRelationsController::class, 'belongsToMany'])->name('form.relations.belongsToMany');
     Route::get('form/relations/belongsToMany/choices', [FormRelationsController::class, 'belongsToManyChoices'])->name('form.relations.belongsToManyChoices');

app/tests/Browser/Form/RelationsTest.php

@@ -3,13 +3,26 @@
 namespace Tests\Browser\Form;
 
 use App\Models\Keyword;
+use App\Models\Project;
 use App\Models\Tag;
 use App\Models\User;
 use Laravel\Dusk\Browser;
 use Tests\DuskTestCase;
 
 class RelationsTest extends DuskTestCase
 {
+    /** @test */
+    public function it_can_find_the_default_value_of_a_nested_relationship()
+    {
+        $this->browse(function (Browser $browser) {
+            $project = Project::first();
+            $browser->visit('form/components/relation')
+                ->waitForText('FormComponents')
+                ->assertValue('@name', $project->name)
+                ->assertValue('@city', $project->organization->address->city);
+        });
+    }
+
     /** @test */
     public function it_can_handle_a_belongs_to_many_relationship()
     {

src/Components/Form.php

@@ -239,18 +239,17 @@ private static function resourceShouldBeGuarded($resource): bool
     /**
      * Returns an array with all allowed attributes, sorted by their length.
      *
-     * @return array
+     * @return \Illuminate\Support\Collection
      */
-    private static function allowedAttributesSorted(): array
+    private static function allowedAttributesSorted(): Collection
     {
         return Collection::make(static::$allowedAttributes)
             ->filter()
             ->keys()
             ->sortBy(function ($key) {
                 return Str::substrCount($key, '.');
             })
-            ->values()
-            ->all();
+            ->values();
     }
 
     /**
@@ -275,13 +274,31 @@ private function guardedData(): ?object
         $guardedData = [];
 
         // Loop through all attributes, and add the data to the $guardedData when it exists.
-        foreach (static::allowedAttributesSorted() as $attribute) {
-            if (!Arr::has($rawData, $attribute)) {
-                continue;
+        static::allowedAttributesSorted()->each(function ($attribute) use ($rawData, &$guardedData) {
+            if (Arr::has($rawData, $attribute)) {
+                return data_set($guardedData, $attribute, data_get($rawData, $attribute));
             }
 
-            data_set($guardedData, $attribute, data_get($rawData, $attribute));
-        }
+            if (!$this->model) {
+                return;
+            }
+
+            $parts = explode('.', $attribute);
+
+            if (count($parts) < 2) {
+                return;
+            }
+
+            $column = array_pop($parts);
+
+            $relation = data_get($this->model, implode('.', $parts));
+
+            $relationAttributes = $relation->attributesToArray();
+
+            if (Arr::has($relationAttributes, $column)) {
+                data_set($guardedData, $attribute, data_get($relationAttributes, $column));
+            }
+        });
 
         if (!$this->model) {
             return (object) $guardedData;