How do factories handle relationships between models differently than seeders

Factories

Factories are used to generate fake data for testing purposes. They are particularly useful for creating related models. Factories can leverage the `->has()` and `->for()` methods to define relationships between models:

- `->has()` is used when you want to create multiple related models for each instance of the main model. For example, creating a category with multiple associated posts.
- `->for()` is used when you want to associate a single related model with each instance of the main model. For example, creating a post and associating it with a specific category.

This allows you to easily generate complex, related data structures for testing without having to manually set up all the relationships.

Seeders

Seeders, on the other hand, are used to populate the database with initial data, often for development and testing purposes. Seeders typically use factories to generate the data, but the focus is on setting up a consistent state for the application, not just creating random test data.

With seeders, you would typically use relationships more explicitly, such as:

- Creating a user, then creating posts associated with that user.
- Creating a category, then creating posts and associating them with that category.

The goal with seeders is to create a meaningful, realistic dataset, rather than just random data. Seeders allow you to control the relationships between models and ensure the data makes sense for your application.

In summary, factories are better suited for generating random, related data for testing, while seeders are more focused on setting up a consistent, meaningful dataset for development and testing purposes. Factories leverage the `->has()` and `->for()` methods to define relationships, while seeders tend to create relationships more explicitly.