Adds new GroupedUser relation with mandatory relation to groups + tests

tests/Concerns/ToModelTest.php

@@ -10,6 +10,7 @@
 use Maatwebsite\Excel\Concerns\PersistRelations;
 use Maatwebsite\Excel\Concerns\ToModel;
 use Maatwebsite\Excel\Tests\Data\Stubs\Database\Group;
+use Maatwebsite\Excel\Tests\Data\Stubs\Database\GroupedUser;
 use Maatwebsite\Excel\Tests\Data\Stubs\Database\User;
 use Maatwebsite\Excel\Tests\TestCase;
 
@@ -260,4 +261,47 @@ public function model(array $row)
         $this->assertEquals(2, Group::count());
         DB::connection()->disableQueryLog();
     }
+
+    public function test_can_import_models_with_non_nullable_belongs_to_many_relations()
+    {
+        Group::query()->truncate();
+        GroupedUser::query()->truncate();
+
+        DB::connection()->enableQueryLog();
+
+        $import = new class implements ToModel, PersistRelations
+        {
+            use Importable;
+
+            /**
+             * @param  array  $row
+             * @return GroupedUser
+             */
+            public function model(array $row): GroupedUser
+            {
+                $groupedUser = new GroupedUser([
+                    'name'     => $row[0],
+                    'email'    => $row[1],
+                    'password' => 'secret',
+                ]);
+
+                $groupedUser->setRelation('group', new Group(['name' => $row[0]]));
+
+                return $groupedUser;
+            }
+        };
+
+        $import->import('import-users.xlsx');
+
+        $this->assertCount(6, DB::getQueryLog());
+
+        $users = GroupedUser::all();
+        $users->each(function (GroupedUser $groupedUser) {
+            $this->assertInstanceOf(Group::class, $groupedUser->group);
+        });
+
+        $this->assertCount(2, $users);
+        $this->assertEquals(2, Group::count());
+        DB::connection()->disableQueryLog();
+    }
 }

tests/Data/Stubs/Database/GroupedUser.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Maatwebsite\Excel\Tests\Data\Stubs\Database;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class GroupedUser extends Model
+{
+    protected $fillable = [
+        'name',
+        'email',
+        'password',
+    ];
+
+    public function group(): BelongsTo
+    {
+        return $this->belongsTo(Group::class);
+    }
+}

tests/Data/Stubs/Database/Migrations/0000_00_00_000003_create_grouped_users_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateGroupedUsersTable extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up()
+    {
+        Schema::create('grouped_users', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('name');
+            $table->string('email');
+            $table->string('password');
+            $table->unsignedInteger('group_id')->index();
+
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down()
+    {
+        Schema::dropIfExists('grouped_users');
+    }
+}