Backend Models

Eloquent relationships like hasMany, belongsTo, and belongsToMany let you connect models intuitively. Define them as methods in your model class to establish data connections—for example, a User hasMany Posts, and each Post belongsTo a User, enabling chainable queries across related data.

Enforce data integrity through multiple layers: define correct data types and database constraints in migrations, use mass-assignment protection with fillable or guarded properties, apply attribute casting for type safety, and add validation logic to reject invalid input before persistence.

Use the fillable property to whitelist attributes users can mass-assign, or use guarded to blacklist specific attributes. This prevents unauthorized fields from being set through assignment, protecting sensitive columns like admin flags or encrypted data from unintended modification.

Yes. Accessors retrieve and transform attribute values when accessed, while mutators modify values before storage. Use them to format dates, hash passwords, encrypt sensitive data, or compute derived properties without altering the underlying database column.

Yes. Eloquent relationships define application-level connections, but database constraints (foreign keys, unique, not null) enforce data integrity at the database layer, preventing orphaned records and invalid states that application logic alone cannot protect.

Factories generate fake model instances with realistic test data; seeders populate your database in bulk. Define factory attributes in database/factories, then use seeders to call factories and insert records, enabling consistent, repeatable test environments without manual record creation.