Eager Load Nested Relationships with Dot Notation

Use dot-notation strings inside with() to eager load deeply nested relationships in single database query chains.

When fetching models that require multi-level relationships (e.g. Posts -> Comments -> Author), use dot-notation strings in with() to eager load all levels efficiently.

use App\Models\Post;

// Eager loads post author, comments, and comment authors
$posts = Post::with(['author', 'comments.author'])->get();

• Eager loads multi-level nested relationships cleanly in dot-notation strings
• Prevents cascading N+1 query problems across nested views
• Allows applying constraints to nested levels using array key closures