diff --git a/app/Models/Course.ts b/app/Models/Course.ts
index 7007864..10ada89 100644
--- a/app/Models/Course.ts
+++ b/app/Models/Course.ts
@@ -32,10 +32,10 @@ export default class Course extends BaseModel {
   @column()
   public description: string;
 
-  @column()
+  @column({ serializeAs: null })
   public teacher_id: string;
 
-  @column()
+  @column({ serializeAs: null })
   public category_id: string;
 
   @column({ serializeAs: null })
diff --git a/app/Repositories/CourseRepository.ts b/app/Repositories/CourseRepository.ts
index ef28045..13ea5e5 100644
--- a/app/Repositories/CourseRepository.ts
+++ b/app/Repositories/CourseRepository.ts
@@ -49,6 +49,7 @@ export default class CourseRepository {
       .preload('teacher')
       .preload('category')
       .preload('lessons')
+      .preload('students')
       .preload('image')
       .where('status', CourseStatusEnum.PUBLISHED);
     return courses;
diff --git a/database/factories/index.ts b/database/factories/index.ts
index 5f4422a..fb205db 100644
--- a/database/factories/index.ts
+++ b/database/factories/index.ts
@@ -27,7 +27,7 @@ export const UserFactory = Factory.define(User, ({ faker }) => {
     last_name: faker.name.lastName(),
     login: `${faker.lorem.word(6)}${faker.datatype.number(10)}`,
     email: faker.internet.exampleEmail(),
-    password: '12345',
+    password: '123456',
   };
 })
   .relation('contacts', () => ContactFactory)
diff --git a/database/seeders/User.ts b/database/seeders/User.ts
index 89c7cf2..06e066a 100644
--- a/database/seeders/User.ts
+++ b/database/seeders/User.ts
@@ -22,7 +22,7 @@ export default class UserSeeder extends BaseSeeder {
       first_name: 'John',
       last_name: 'Doe',
       login: 'admin',
-      password: '12345',
+      password: '123456',
       email: 'example.email@mail.com',
     });
     await userAdmin.related('roles').attach([roles.admin.id]);