Resources

Name: Resources Description: API resource classes that transform Eloquent models into JSON-ready arrays. Resources control exactly what is exposed in API responses and handle relationships, conditional attributes, and date formatting. Compatible Agents: general-purpose, backend Tags: app/Http/Resources/**/*.php, laravel, php, backend, api, resource, json, response

Rules

• Resource classes live in app/Http/Resources/
• Single resource: ModelResource → UserResource, PostResource
• Collection resource: ModelCollection → UserCollection, PostCollection
• Only expose what the API consumer needs — never blindly expose every model attribute
• Use whenLoaded() for related resources — never eager load inside the resource itself
• Use when(), whenHas(), or whenNotNull() for conditional attributes — not if statements in the array
• Use mergeWhen() for multiple attributes sharing the same condition
• Use UserResource::collection() for simple collections — only create a dedicated collection class when custom meta is needed
• Do not add pagination meta manually — pass a paginator directly and let Laravel append it

Examples

class UserResource extends JsonResource
{
    public function toArray(Request $request): array
    {
        return [
            'id'         => $this->id,
            'name'       => $this->name,
            'email'      => $this->email,
            'posts'      => PostResource::collection($this->whenLoaded('posts')),
            'secret'     => $this->when($request->user()->isAdmin(), $this->secret),
            'bio'        => $this->whenNotNull($this->bio),
            'created_at' => DateHelper::format($this->created_at),
        ];
    }
}

// Controller — eager load before passing to resource
return UserResource::collection(User::with('posts')->paginate());

// Dedicated collection — only when custom meta is needed
class UserCollection extends ResourceCollection
{
    public function toArray(Request $request): array
    {
        return [
            'data'  => $this->collection,
            'links' => ['self' => route('users.index')],
        ];
    }
}

Anti-Patterns

• Exposing all model attributes without whitelisting
• Eager loading relationships inside the resource's toArray() — load them in the controller
• Using if statements inside the response array instead of when(), whenLoaded(), whenNotNull()
• Creating a dedicated collection class just for a simple list (use UserResource::collection())
• Putting business logic or database queries in a resource
• Manually adding pagination meta that Laravel already provides automatically

References

• Laravel API Resources
• Related: Controllers/SKILL.md — eager loading is done in the controller
• Related: Helpers/SKILL.md — use DateHelper::format() for date formatting