igmarin/seed-database
skills/infrastructure/seed-database/SKILL.md
Use when managing development and test data in Rails — must write idempotent seeds using find_or_create_by!, run seeds with rails db:seed or rails db:setup, verify data by opening rails console and spot-checking records, use ENV variables or SecureRandom for non-production data without committing secrets in code, and use rails credentials:edit for production secrets. Trigger words: seeds, fixtures, seeding, db:seed, test data.
$ install --global
skillsauthnpx skillsauth add igmarin/rails-agent-skills seed-databaseInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- seed-database
- type:
- atomic
- license:
- MIT
- description:
- >
- Use when managing development and test data in Rails — must write idempotent seeds using find_or_create_by!, run seeds with rails db:
- seed or rails db:setup, verify data by opening rails console and spot-checking records, use ENV variables or SecureRandom for non-production data without committing secrets in code, and use rails credentials:edit for production secrets. Trigger words: seeds, fixtures, seeding, db:seed, test data.
- version:
- 1.0.0
- user-invocable:
- true
Seed Database
Manage development and test data effectively.
Quick Reference
| Use | Solution |
|-----|----------|
| Static reference data | db/seeds.rb with find_or_create_by! |
| Test scenarios | FactoryBot in spec/factories/ |
| Complex relationships | Both combined |
HARD-GATE
NEVER commit production data to seeds
ALWAYS use factories for test-specific scenarios
ALWAYS make seeds idempotent (can run multiple times safely)
NEVER hardcode credentials (passwords, API keys, secrets) in seeds, factories, or examples
- Use ENV variables (e.g., ENV.fetch('DEFAULT_SEED_PASSWORD')) or SecureRandom.hex(16) for non-production data
- Use `rails credentials:edit` to manage production secrets, never commit them in code
Core Process
- Write idempotent seeds — use
find_or_create_by!so re-runs are safe. - Scope by environment — guard non-production data with
Rails.envchecks. - Run seeds — execute
rails db:seed(orrails db:setupfor a fresh database). - Validate idempotency — run
rails db:seeda second time and confirm no duplicates or errors. - Verify data — open
rails consoleand spot-check expected records exist with correct attributes.
Minimal Inline Example
A copy-paste ready db/seeds.rb covering idempotency, environment scoping, and safe credentials:
# db/seeds.rb
# Static reference data — safe to run repeatedly
Role.find_or_create_by!(name: 'admin') do |r|
r.description = 'Full system access'
end
Role.find_or_create_by!(name: 'member') do |r|
r.description = 'Standard user access'
end
# Development-only seed data — never runs in production
if Rails.env.development?
User.find_or_create_by!(email: '[email protected]') do |u|
u.role = Role.find_by!(name: 'admin')
u.password = ENV.fetch('DEFAULT_SEED_PASSWORD', SecureRandom.hex(16))
end
end
For FactoryBot factory definitions and more complex relationship patterns, see EXAMPLES.md.
Extended Resources (Progressive Disclosure)
Load these files only when their specific content is needed:
- EXAMPLES.md — Use when you need complete seeding examples with environment-specific patterns and FactoryBot factory definitions
- references/workflow.md — Use when implementing complex seeding workflows or migration-dependent seed data
Reference Links
- FactoryBot documentation
- Faker gem
- Rails Seeding Guide
Output Style
- Use idiomatic Rails seeding patterns.
- Structure factories clearly.
- Follow the credential and idempotency rules in HARD-GATE without exception.
- Include verification commands:
rails db:seed, a second idempotency run, and arails consolespot-check. - Language — Must be in English unless explicitly requested otherwise.
Integration
| Skill | When to chain | |-------|---------------| | write-tests | When setting up test scenarios | | review-migration | When ensuring DB schema is aligned |
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