laravel:eloquent-relationships

Fix the N+1 query problem in Laravel Eloquent by using eager loading methods like `with` and `load` to fetch related models in a single database query instead of issuing separate queries per model.

Define one-to-many and many-to-many relationships in Laravel by declaring association methods within Eloquent models, which allows you to clearly express structural links and safely manage pivot tables using `sync` and `syncWithoutDetaching`.

Load counts and sums from related models in Laravel without extra queries by utilizing aggregate loading methods like `withCount` and `withSum`, which efficiently retrieve aggregate data alongside your primary Eloquent models.

Process large Laravel datasets efficiently without running out of memory by using the `lazy()` chunking method, which enables memory-friendly iteration over extensive Eloquent records by loading data in chunks.

Apply constraints to eager loaded relationships in Laravel by utilizing constrained eager loading, allowing you to filter and limit related data fetched via `with` to optimize database performance and retrieve only necessary records.