Why relationships model real data in Laravel - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a one-to-many relationship in a Laravel model.

Laravel

public function posts() {
    return $this->[1](Post::class);
}

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

AhasMany

BbelongsTo

ChasOne

DbelongsToMany

Attempts:

3 left

💡 Hint

Common Mistakes

Using belongsTo instead of hasMany

Using hasOne which defines a one-to-one relationship

In Laravel, a one-to-many relationship is defined using the hasMany method.

2fill in blank

medium

Complete the code to define the inverse of a one-to-many relationship in a Laravel model.

Laravel

public function user() {
    return $this->[1](User::class);
}

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

AhasMany

BbelongsToMany

ChasOne

DbelongsTo

Attempts:

3 left

💡 Hint

Common Mistakes

Using hasMany instead of belongsTo

Confusing belongsToMany with belongsTo

The inverse of a one-to-many relationship is defined with belongsTo in Laravel.

3fill in blank

hard

Fix the error in the code to correctly define a many-to-many relationship in a Laravel model.

Laravel

public function roles() {
    return $this->[1](Role::class);
}

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

AhasMany

BbelongsTo

CbelongsToMany

DhasOne

Attempts:

3 left

💡 Hint

Common Mistakes

Using hasMany which is for one-to-many

Using belongsTo which is for inverse one-to-many

Many-to-many relationships in Laravel use the belongsToMany method.

4fill in blank

hard

Fill both blanks to define a one-to-one relationship and access the related model's attribute.

Laravel

public function profile() {
    return $this->[1](Profile::class);
}

$name = $user->profile->[2];

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

AhasOne

BbelongsTo

Cname

Demail

Attempts:

3 left

💡 Hint

Common Mistakes

Using belongsTo instead of hasOne

Accessing an attribute that does not exist

A one-to-one relationship uses hasOne. Accessing the related model's name attribute shows the user's profile name.

5fill in blank

hard

Fill all three blanks to create a dictionary of post titles and their authors' emails for posts with more than 100 likes.

Laravel

return collect($posts)->filter(fn($post) => $post->likes > [1])
    ->mapWithKeys(fn($post) => [
        $post->[2] => $post->user->[3]
    ]);

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

A100

Btitle

Cemail

Dlikes

Attempts:

3 left

💡 Hint

Common Mistakes

Using likes as key instead of title

Using user name instead of email

This code filters posts with more than 100 likes, then creates a dictionary with post titles as keys and authors' emails as values.