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How do you manage relationships between DataObject classes in SilverStripe?

How do you manage relationships between DataObject classes in SilverStripe?

Answer: In SilverStripe, you manage relationships between DataObject classes using relationships defined in the class properties. Common relationship types include:

1. One-to-One: Use `has_one` and `belongs_to` to define a single related object.
2. One-to-Many: Use `has_many` on the parent class and `belongs_to` on the child class.
3. Many-to-Many: Use `many_many` to define a relationship where both classes can relate to multiple instances of each other, and create a pivot join table if needed with `many_many_extraFields`.

These relationships set up the appropriate database schema and allow for querying and managing related data efficiently using SilverStripe’s ORM.

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