igmarin/rails-database-seeding
rails-database-seeding/SKILL.md
Manage development and test data in Rails. Covers fixtures vs seeds, seeding strategies for different environments, test data factories, and production-like data generation. Trigger words: seeds, fixtures, seeding, database seed, test data, development data, db:seed.
$ install --global
skillsauthnpx skillsauth add igmarin/rails-agent-skills rails-database-seedingInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: Apr 30, 2026, 4:48 PM5.4s1 file scanned
SKILL.md
- name:
- rails-database-seeding
- license:
- MIT
- description:
- >
- and production-like data generation. Trigger words:
- seeds, fixtures,
- seeding, database seed, test data, development data, db:
- seed.
Rails Database Seeding
Manage development and test data effectively.
Files: SKILL.md · EXAMPLES.md · references/workflow.md
HARD-GATE
NEVER commit production data to seeds
ALWAYS use factories for test-specific scenarios
ALWAYS make seeds idempotent (can run multiple times safely)
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 |
Seeding Workflow
- 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.
See references/workflow.md for the complete seeding workflow.
Idempotent Seeds
# db/seeds.rb
admin = User.find_or_create_by!(email: '[email protected]') do |u|
u.password = 'password'
u.admin = true
end
Environment-Specific Seeds
# db/seeds.rb
if Rails.env.development?
require Rails.root.join('db/seeds/development')
elsif Rails.env.test?
require Rails.root.join('db/seeds/test')
end
# db/seeds/development.rb
10.times do
User.find_or_create_by!(email: Faker::Internet.unique.email) do |u|
u.password = 'password'
end
end
FactoryBot Factory Example
# spec/factories/users.rb
FactoryBot.define do
factory :user do
email { Faker::Internet.unique.email }
password { 'password' }
trait :admin do
admin { true }
end
end
end
# Usage in specs
create(:user, :admin)
Examples
See EXAMPLES.md for complete examples including:
- Environment-specific seed structure
- FactoryBot factories with traits
- Idempotent seed patterns
- Troubleshooting common issues
External References
- FactoryBot documentation
- Faker gem
- Rails Seeding Guide
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