Ask Claude to Generate Realistic Seed Data and Test Factories from Your Models

Random factory data hides bugs. When your test user is named "asdfgh" with email "test@test.com" and an order total of 0, you miss the real-world edge cases. Claude generates data that matches your domain.

"Read my models and create factory definitions with realistic data for all of them"

Claude reads your models, relationships, column types, and validation rules, then generates factories that produce data matching your domain:

// Instead of this:
'name' => fake()->word(),
'email' => fake()->email(),
'price' => fake()->randomFloat(),

// Claude generates this:
'name' => fake()->name(),
'email' => fake()->unique()->safeEmail(),
'price' => fake()->randomFloat(2, 9.99, 299.99),
'sku' => 'PRD-' . fake()->unique()->numerify('######'),
'status' => fake()->randomElement(['active', 'draft', 'archived']),

You can be specific about what you need:

# Seed data for demos and screenshots
"Create a database seeder with 50 realistic users, each with 2-5 orders
containing real-looking product names and prices for an e-commerce demo"

# Edge case factories
"Add factory states for edge cases — users with special characters in names,
extremely long emails, orders at price boundaries, and expired subscriptions"

# Relationship-aware data
"Generate seed data where orders reference real products and users,
reviews belong to users who actually purchased the product, and
inventory counts match the order history"

Claude handles the hard parts of test data:

• Relationships — ensures foreign keys point to existing records
• Realistic values — prices that look real, dates in sensible ranges, statuses that match your workflow
• Unique constraints — generates data that won't violate unique indexes
• Domain logic — a "shipped" order has a shipping date, a "trial" account expires in 14 days
• Factory states — named states for common scenarios like unverified(), expired(), withSubscription()

Good test data catches bugs that random data hides — Claude writes factories that exercise your code the way real users will.

via Claude Code