# ActiveStorage (Ruby on Rails)

> Upload file, lampiran, has_one_attached, has_many_attached, S3, variants, previews

- 20 pertanyaan wawancara
- Mid-Level
- [Pertanyaan Wawancara: Ruby on Rails](https://sharpskill.dev/id/technologies/ruby-on-rails/pertanyaan-wawancara.md)

## 1. Perintah mana yang harus digunakan untuk menginstal ActiveStorage di aplikasi Rails?

**Jawaban**

Perintah rails active_storage:install menghasilkan migrasi yang diperlukan untuk membuat tabel active_storage_blobs dan active_storage_attachments. Tabel-tabel ini menyimpan metadata tentang file yang diunggah. Setelah instalasi, jalankan rails db:migrate untuk menerapkan migrasi ke database.

## 2. Makro mana yang harus digunakan untuk melampirkan satu file (avatar) ke model User?

**Jawaban**

Makro has_one_attached memungkinkan melampirkan satu file ke sebuah model. Makro ini secara otomatis membuat metode avatar, avatar=, avatar.attach, avatar.attached?, dan avatar.purge. Untuk beberapa file, gunakan has_many_attached.

## 3. Makro mana yang harus digunakan untuk melampirkan beberapa file (documents) ke model Project?

**Jawaban**

Makro has_many_attached memungkinkan melampirkan beberapa file ke sebuah model. Makro ini membuat metode documents, documents.attach, documents.attached?, dan documents.purge. File disimpan dalam sebuah koleksi dan dapat ditambahkan atau dihapus secara individual.

## 17 pertanyaan lagi tersedia

- Metode mana yang harus digunakan untuk memeriksa apakah sebuah file sudah dilampirkan ke sebuah record?
- Di file konfigurasi mana layanan penyimpanan default (local, S3, dll.) harus didefinisikan?

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