Lazy loading vs eager loading in laravel

In Laravel, “lazy loading” and “eager loading” relate to two distinct methods of loading model relationships.

To create a relationship with lazy loading in Laravel, specify the relationship on your model and then use the load method to load the relationship as needed.

Here’s an example of how to use lazy loading to establish a one-to-many relationship between a User model and a Post model:

class User extends Model { 
    public function posts() 
    { return $this->hasMany(Post::class); 
     } }

Lazy loading refers to the practice of loading relationships on demand, or “lazily.” This implies that the relationships are not loaded until the program need them. When a model has a high number of relationships, lazy loading is important because it allows you to defer loading all of the relationships at once, which can increase speed.

In Laravel, utilize the load method on a model instance to lazily load a relationship.To load the posts relationship for a specific user, use the load method as follows

$user = App\User::find(1);

// Load the user's posts relationship lazily
$posts = $user->load('posts');

This will run a second database query to obtain the user’s linked posts.

You can also use the with method to indicate which relationships should be loaded when the model is loaded from the database.

Eager loading,  is a method of loading all of the relationships for a model in a single query instead of running separate queries for each connection as needed. When you know you’ll need to access a model’s connections frequently and want to avoid the expense of running separate queries for each relationship, eager loading comes in handy.

In Laravel, you may eager load a relationship by using the with method on a query builder instance:

$users = App\User::with('posts')->get();
  foreach ($users as $user) {
 // The posts relationship will already be loaded for each user 
  $posts = $user->posts; 
  }

It is critical to examine which approach is most suited to your use case. When you only need to use a model's relationships on occasion, lazy loading can be more efficient since it eliminates the overhead of loading all of the relationships at once. When you know you'll need to access a model's connections frequently, eager loading can be more efficient since it saves the expense of running separate queries for each relationship.

Lazy loading has the advantage of reducing the number of queries required to get data since the relationships are only loaded when they are required. This is especially important when working with big and sophisticated models, as it can assist to minimize overall database load.
When you know you’ll need to use a connection frequently, eager loading can be more efficient since it saves the overhead of loading the relationship on demand.

In general, it is best to utilize lazy loading wherever feasible and eager loading only when essential for performance reasons.

I hope this was helpful! Please let me know if you have any more queries.

Please check out the link to learn more about eager loading.

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