Lazy loading and N+1 prevention in Laravel - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to eager load the 'posts' relationship for all users.

Laravel

$users = User::[1]('posts')->get();

Drag options to blanks, or click blank then click option'

Awith

Bload

Cselect

Dfind

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'load' instead of 'with' on the query builder causes errors.

Using 'select' only chooses columns, not relationships.

Using with('posts') tells Laravel to eager load the posts relationship, preventing N+1 queries.

2fill in blank

medium

Complete the code to lazy load the 'comments' relationship on an existing $post model.

Laravel

$post->[1]('comments');

Drag options to blanks, or click blank then click option'

Aload

Bwith

CeagerLoad

Dfetch

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'with' on a model instance instead of a query builder.

Using non-existent methods like 'eagerLoad' or 'fetch'.

The load method is used on an existing model instance to lazy load relationships.

3fill in blank

hard

Fix the error in the code to prevent N+1 queries when accessing each user's posts count.

Laravel

foreach ($users as $user) {
    echo $user->posts->count();
}

// Fix by eager loading posts count:
$users = User::[1]('posts')->get();

Drag options to blanks, or click blank then click option'

AloadCount

BwithCount

CcountWith

DwithPostsCount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'loadCount' which is a method on model instances, not query builder.

Using made-up methods like 'countWith' or 'withPostsCount'.

The withCount method eager loads the count of related models, preventing N+1 queries when counting posts.

4fill in blank

hard

Fill both blanks to eager load 'comments' and 'author' relationships for posts.

Laravel

$posts = Post::[1](['comments', [2]])->get();

Drag options to blanks, or click blank then click option'

Awith

Bload

C'author'

D'user'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'load' instead of 'with' on the query builder.

Using 'user' instead of 'author' if the relationship is named 'author'.

Use with to eager load multiple relationships. The 'author' relationship is commonly named for the user who wrote the post.

5fill in blank

hard

Fill all three blanks to eager load 'tags', count 'comments', and filter posts with more than 5 comments.

Laravel

$posts = Post::[1]('tags')->[2]('comments')->having('[3]', '>', 5)->get();

Drag options to blanks, or click blank then click option'

Awith

BwithCount

Ccomments_count

Dload

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'load' instead of 'with' on the query builder.

Using 'comments' instead of 'comments_count' in having clause.

Use with('tags') to eager load tags, withCount('comments') to get comments count, and filter with having('comments_count', '>', 5).