fix(database): nullable belongsto relations

mago.toml

@@ -35,6 +35,7 @@ empty-line-after-opening-tag = false
 integrations = ["php-unit", "tempest"]
 
 [linter.rules]
+yoda-conditions = { enabled = false }
 interface-name = { psr = false }
 trait-name = { psr = false }
 class-name = { psr = false }

packages/console/src/Components/Renderers/TextInputRenderer.php

@@ -40,7 +40,6 @@ public function render(
         }
 
         // splits the text to an array so we can work with individual lines
-        // @mago-expect lint:no-nested-ternary
         $lines = str($buffer->text ?: ($placeholder ?: ''))
             ->explode("\n")
             ->flatMap(fn (string $line) => str($line)->chunk($this->maxLineCharacters)->toArray())

packages/database/src/Mappers/SelectModelMapper.php

@@ -54,18 +54,24 @@ private function values(ModelInspector $model, array $data): array
         foreach ($data as $key => $value) {
             $relation = $model->getRelation($key);
 
-            if (! $relation instanceof HasMany) {
+            if ($relation instanceof BelongsTo) {
+                if ($relation->property->isNullable() && array_filter($data[$relation->name] ?? []) === []) {
+                    $data[$relation->name] = null;
+                }
+
                 continue;
             }
 
-            $mapped = [];
-            $relationModel = inspect($relation);
+            if ($relation instanceof HasMany) {
+                $mapped = [];
+                $relationModel = inspect($relation);
 
-            foreach ($value as $item) {
-                $mapped[] = $this->values($relationModel, $item);
-            }
+                foreach ($value as $item) {
+                    $mapped[] = $this->values($relationModel, $item);
+                }
 
-            $data[$key] = $mapped;
+                $data[$key] = $mapped;
+            }
         }
 
         return $data;

packages/mapper/src/Mappers/ArrayToObjectMapper.php

@@ -154,6 +154,10 @@ public function resolveValue(PropertyReflector $property, mixed $value): mixed
     {
         $caster = $this->casterFactory->forProperty($property);
 
+        if ($property->isNullable() && $value === null) {
+            return null;
+        }
+
         if ($caster === null) {
             return $value;
         }

packages/support/src/Str/functions.php

@@ -63,6 +63,7 @@ function to_snake_case(Stringable|string $string, Stringable|string $delimiter =
 
         $string = preg_replace('/(?<=\p{Ll}|\p{N})(\p{Lu})/u', $delimiter . '$1', $string);
         $string = preg_replace('/(?<=\p{Lu})(\p{Lu}\p{Ll})/u', $delimiter . '$1', $string);
+        // @mago-expect lint:require-preg-quote-delimiter
         $string = preg_replace('![^' . preg_quote($delimiter) . '\pL\pN\s]+!u', $delimiter, mb_strtolower($string, 'UTF-8'));
         $string = preg_replace('/\s+/u', $delimiter, $string);
         $string = trim($string, $delimiter);

packages/view/src/Elements/PhpDataElement.php

@@ -42,7 +42,6 @@ public function compile(): string
             $localVariableName,
             $localVariableName,
             $isExpression
-                // @mago-expect lint:no-nested-ternary
                 ? ($value ?: 'null')
                 : var_export($value, return: true),
         );

tests/Integration/Database/Builder/IsDatabaseModelTest.php

@@ -617,6 +617,21 @@ public function test_delete_nonexistent_record(): void
 
         $this->assertNull(Foo::get($fooId));
     }
+
+    public function test_nullable_relations(): void
+    {
+        $this->migrate(
+            CreateMigrationsTable::class,
+            CreateBNullableTable::class,
+            CreateANullableTable::class,
+        );
+
+        $a = ANullableModel::create();
+
+        $a->load('b');
+
+        $this->assertNull($a->b);
+    }
 }
 
 final class Foo
@@ -963,3 +978,43 @@ public function up(): QueryStatement
             ->text('description');
     }
 }
+
+final class CreateANullableTable implements MigratesUp
+{
+    private(set) string $name = '100-create-a-nullable';
+
+    public function up(): QueryStatement
+    {
+        return new CreateTableStatement('a')
+            ->primary()
+            ->belongsTo('a.b_id', 'b.id', nullable: true);
+    }
+}
+
+final class CreateBNullableTable implements MigratesUp
+{
+    private(set) string $name = '100-create-b-nullable';
+
+    public function up(): QueryStatement
+    {
+        return new CreateTableStatement('b')
+            ->primary()
+            ->string('name');
+    }
+}
+
+#[Table('a')]
+final class ANullableModel
+{
+    use IsDatabaseModel;
+
+    public ?BNullableModel $b = null;
+}
+
+#[Table('b')]
+final class BNullableModel
+{
+    use IsDatabaseModel;
+
+    public string $name;
+}

tests/Integration/Database/MultiDatabaseTest.php

@@ -306,7 +306,7 @@ public function test_database_seed_on_selected_database(): void
 
         $this->assertSame(
             'Timeline Taxi',
-            query(Book::class)->select()->onDatabase('main')->first()->title,
+            query(Book::class)->select()->onDatabase('main')->where('title', 'Timeline Taxi')->first()->title,
         );
 
         $this->assertNull(
@@ -318,8 +318,7 @@ public function test_database_seed_on_selected_database(): void
             ->assertSuccess();
 
         /** @var Book $book */
-        /** @phpstan-ignore-next-line */
-        $book = query(Book::class)->select()->onDatabase('backup')->first();
+        $book = query(Book::class)->select()->onDatabase('backup')->where('title', 'Timeline Taxi')->first();
 
         $this->assertSame(
             'Timeline Taxi',
@@ -335,7 +334,7 @@ public function test_migrate_fresh_seed_on_selected_database(): void
 
         $this->assertSame(
             'Timeline Taxi',
-            query(Book::class)->select()->onDatabase('main')->first()->title,
+            query(Book::class)->select()->onDatabase('main')->where('title', 'Timeline Taxi')->first()->title,
         );
 
         $this->assertException(QueryWasInvalid::class, function (): void {
@@ -348,7 +347,7 @@ public function test_migrate_fresh_seed_on_selected_database(): void
 
         $this->assertSame(
             'Timeline Taxi',
-            query(Book::class)->select()->onDatabase('backup')->first()->title,
+            query(Book::class)->select()->onDatabase('backup')->where('title', 'Timeline Taxi')->first()->title,
         );
     }