Active Storage Setup
Configures Active Storage for file uploads with variants and direct uploads.
Install
npx skills add ThibautBaissac/rails_ai_agents --skill active-storage-setup -g -a claude-code -y- Repository
- ThibautBaissac/rails_ai_agents671
- Category
- Data and ML
- Updated
- 5mo ago
- License
- MIT
- Context cost
- Lightabout 1,027 tokens
- Runs scripts
- No, instructions only
What it does
Configures Active Storage for file uploads with variants and direct uploads. Use when adding file uploads, image attachments, document storage, generating thumbnails, or when user mentions Active Storage, file upload, attachments, or image processing. WHEN NOT: Storing data in database columns, external URL references, static assets in the asset pipeline, or simple text/JSON storage.
Active Storage Setup for Rails 8
Overview
Active Storage handles file uploads in Rails:
- Cloud storage (S3, GCS, Azure) or local disk
- Image variants (thumbnails, resizing)
- Direct uploads from browser
- Polymorphic attachments
Quick Start
# Install Active Storage (if not already)
bin/rails active_storage:install
bin/rails db:migrate
# Add image processing
bundle add image_processing
Configuration
Storage Services
# config/storage.yml
local:
service: Disk
root: <%= Rails.root.join("storage") %>
test:
service: Disk
root: <%= Rails.root.join("tmp/storage") %>
amazon:
service: S3
access_key_id: <%= Rails.application.credentials.dig(:aws, :access_key_id) %>
secret_access_key: <%= Rails.application.credentials.dig(:aws, :secret_access_key) %>
region: eu-west-1
bucket: <%= Rails.application.credentials.dig(:aws, :bucket) %>
google:
service: GCS
credentials: <%= Rails.root.join("config/gcs-credentials.json") %>
project: my-project
bucket: my-bucket
Environment Config
# config/environments/development.rb
config.active_storage.service = :local
# config/environments/production.rb
config.active_storage.service = :amazon
Model Attachments
Single Attachment
# app/models/user.rb
class User < ApplicationRecord
has_one_attached :avatar
# With variant defaults
has_one_attached :avatar do |attachable|
attachable.variant :thumb, resize_to_limit: [100, 100]
attachable.variant :medium, resize_to_limit: [300, 300]
end
end
Multiple Attachments
# app/models/event.rb
class Event < ApplicationRecord
has_many_attached :photos
has_many_attached :documents do |attachable|
attachable.variant :preview, resize_to_limit: [200, 200]
end
end
