Interview question

What is lazy loading vs eager loading and when should you use each? Lazy loading और eager loading में क्या अंतर है, कब कौन-सा इस्तेमाल करें?

Answer

Approach	Behavior	Best when
Lazy loading	Related data loaded only when accessed	Related data isn't always needed
Eager loading	Related data loaded upfront in one query	You know you'll need related data for every record

// Lazy loading (default) - triggers query when accessed
$post = Post::find(1);
echo $post->author->name; // separate query fired here

// Eager loading - loads relationship upfront
$posts = Post::with('author')->get();
foreach ($posts as $post) {
    echo $post->author->name; // no extra queries
}

Rule of thumb: if you're looping over a collection and accessing a relationship inside the loop, eager load it to avoid N+1 queries.

Approach	व्यवहार	कब बेहतर
Lazy loading	सिर्फ access होने पर related data load होता है	Related data हमेशा ज़रूरी नहीं
Eager loading	Related data पहले से एक query में load	हर record के लिए related data चाहिए

$post = Post::find(1);
echo $post->author->name; // यहाँ query fire होती है

$posts = Post::with('author')->get();
foreach ($posts as $post) {
    echo $post->author->name; // कोई extra query नहीं
}

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