Has-many-through in Laravel - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

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

Laravel

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

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

AhasManyThrough

BbelongsToMany

ChasOneThrough

DbelongsTo

Attempts:

3 left

💡 Hint

Common Mistakes

Using belongsToMany instead of hasManyThrough

Using hasOneThrough which is for one-to-one relationships

Using belongsTo which is for inverse one-to-one or many-to-one

The hasManyThrough method defines a has-many-through relationship in Laravel.

2fill in blank

medium

Complete the code to specify the foreign key on the intermediate model in a has-many-through relationship.

Laravel

return $this->hasManyThrough(Post::class, Country::class, '[1]');

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

Aid

Buser_id

Cpost_id

Dcountry_id

Attempts:

3 left

💡 Hint

Common Mistakes

Using the foreign key of the final model instead of the intermediate model

Using the primary key 'id' instead of a foreign key

The third parameter in hasManyThrough is the foreign key on the intermediate model.

3fill in blank

hard

Fix the error in the has-many-through relationship by completing the foreign key on the final model.

Laravel

return $this->hasManyThrough(Post::class, Country::class, 'country_id', '[1]');

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

Acountry_id

Buser_id

Cpost_id

Did

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same foreign key as the intermediate model

Using the primary key 'id' instead of a foreign key

The fourth parameter is the foreign key on the final model that links to the intermediate model.

4fill in blank

hard

Fill both blanks to complete the has-many-through relationship with custom local keys.

Laravel

return $this->hasManyThrough(Post::class, Country::class, '[1]', '[2]', 'id', 'id');

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

Acountry_id

Buser_id

Cpost_id

Dauthor_id

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of foreign keys

Using primary keys instead of foreign keys

The third and fourth parameters are the foreign keys on the intermediate and final models respectively.

5fill in blank

hard

Fill all three blanks to complete the has-many-through relationship with all custom keys.

Laravel

return $this->hasManyThrough(Post::class, Country::class, '[1]', '[2]', '[3]');

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

Acountry_id

Buser_id

Cid

Dauthor_id

Attempts:

3 left

💡 Hint

Common Mistakes

Using default keys without specifying when custom keys are needed

Mixing up the order of parameters

The third and fourth parameters are foreign keys on intermediate and final models, the fifth is the local key on the parent model.