Resolves #32 - A guest or an authenticated user can list answers of a question

domains/Discussions/Controllers/QuestionsGetAnswersController.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace Domains\Discussions\Controllers;
+
+use Illuminate\Http\Request;
+use App\Http\Controllers\Controller;
+use Domains\Discussions\Models\Question;
+use  Illuminate\Database\Eloquent\Builder;
+use Illuminate\Contracts\Auth\Factory as Auth;
+use Illuminate\Contracts\Pagination\Paginator;
+
+class QuestionsGetAnswersController extends Controller
+{
+private Question $question;
+
+    public function __construct(Auth $auth, Question $question)
+    {
+        if ($auth->guest()) {
+            $this->middleware('throttle:30,1');
+        }
+
+        $this->question = $question;
+    }
+
+    public function __invoke(int $id, Request $request): Paginator
+    {
+        $this->validate($request, [
+            'author' => 'sometimes|integer|exists:users,id',
+            'created' => 'sometimes|array|size:2',
+            'created.from' => 'required_with:created|date',
+            'created.to' => 'required_with:created|date|afterOrEqual:created.from'
+        ]);
+
+        return $this->question
+            ->findOrFail($id)
+            ->answers()
+            ->when($authorId = $request->input('author'),
+                static fn(Builder $answers, int $authorId) => $answers->whereAuthorId($authorId))
+            ->when($created = $request->input('created'),
+                static fn(Builder $answers, array $created) => $answers->whereBetween('created_at', [$created['from'], $created['to']]))
+            ->latest()
+        ->simplePaginate(15);
+    }
+}

domains/Discussions/Models/Question.php

@@ -6,6 +6,7 @@
 use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\SoftDeletes;
 
 class Question extends Model
@@ -22,6 +23,11 @@ public function author(): BelongsTo
             ->withTrashed();
     }
 
+    public function answers(): HasMany
+    {
+        return $this->hasMany(Answer::class);
+    }
+
     public function scopeFindByAuthorId(Builder $query, int $term): Builder
     {
         return $query->where('author_id', $term);

domains/Discussions/Tests/Feature/QuestionsGetAnswersTest.php

@@ -0,0 +1,115 @@
+<?php
+
+namespace Domains\Discussions\Tests\Feature;
+
+use Carbon\Carbon;
+use Faker\Factory;
+use Tests\TestCase;
+use Faker\Generator;
+use Illuminate\Http\Response;
+use Domains\Accounts\Models\User;
+use Domains\Discussions\Models\Answer;
+use Domains\Discussions\Models\Question;
+use Laravel\Lumen\Testing\DatabaseMigrations;
+use Domains\Accounts\Database\Factories\UserFactory;
+use Domains\Discussions\Database\Factories\AnswerFactory;
+use Domains\Discussions\Database\Factories\QuestionFactory;
+
+class QuestionsGetAnswersTest extends TestCase
+{
+    use DatabaseMigrations;
+
+    private User $user;
+    private User $secondUser;
+    private Question $question;
+    private Answer $answer;
+    private Answer $secondAnswer;
+    private Answer $thirdAnswer;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->user = UserFactory::new()->create();
+        $this->secondUser = UserFactory::new()->create();
+
+        $this->question = QuestionFactory::new([
+            'author_id' => $this->user->id
+        ])->create();
+
+        $this->answer = AnswerFactory::new([
+            'question_id' => $this->question->id,
+            'author_id' => $this->user->id,
+            'created_at' => Carbon::now()->subWeek()->toDateTimeString()
+        ])->create();
+
+        $this->secondAnswer = AnswerFactory::new([
+            'question_id' => $this->question->id,
+            'author_id' => $this->secondUser->id,
+            'created_at' => Carbon::now()->toDateTimeString()
+        ])->create();
+
+        $this->thirdAnswer = AnswerFactory::new([
+            'question_id' => $this->question->id,
+            'author_id' => $this->user->id,
+            'created_at' => Carbon::now()->subWeek()->toDateTimeString()
+        ])->create();
+    }
+
+    /** @test */
+    public function it_gets_paginated_answers_for_a_question(): void
+    {
+        $this->get(route('discussions.questions.answersList', ['id' => $this->question->id]))
+            ->seeJson([
+                "id" => $this->answer->id,
+                "question_id" => '' . $this->question->id
+            ])
+            ->seeJson([
+                "id" => $this->secondAnswer->id,
+                "question_id" => '' . $this->question->id
+            ]);
+    }
+
+    /** @test */
+    public function it_gets_paginated_answers_for_a_question_from_a_particular_author(): void
+    {
+        $this->get(route('discussions.questions.answersList', ['id' => $this->question->id, 'author' => $this->user->id]))
+            ->seeJson(['id' => $this->answer->id])
+            ->dontSeeJson(['id' => $this->secondAnswer->id]);
+    }
+
+    /** @test */
+    public function it_gets_paginated_answers_for_a_question_from_a_particular_time_frame(): void
+    {
+        $aWeekAgo = Carbon::now()->subDays(8);
+        $yesterday = Carbon::yesterday();
+
+        $this->get(route('discussions.questions.answersList', ['id' => $this->question->id]) . '?created[from]=' . $aWeekAgo->format('Y-m-d') . '&created[to]=' . $yesterday->format('Y-m-d'))
+            ->seeJson([
+                "id" => $this->answer->id,
+                "question_id" => '' . $this->question->id
+            ])
+            ->dontSeeJson([
+                "id" => $this->secondAnswer->id
+            ]);
+    }
+
+    /** @test */
+    public function it_gets_paginated_answers_for_a_question_from_a_particular_time_frame_and_user(): void
+    {
+        $aWeekAgo = Carbon::now()->subDays(8);
+        $yesterday = Carbon::yesterday();
+
+        $this->get(route('discussions.questions.answersList', ['id' => $this->question->id]) . '?created[from]=' . $aWeekAgo->format('Y-m-d') . '&created[to]=' . $yesterday->format('Y-m-d') . '&author=1')
+            ->seeJson([
+                "id" => $this->answer->id,
+                "question_id" => '' . $this->question->id
+            ])
+            ->seeJson([
+                "id" => $this->thirdAnswer->id,
+            ])
+            ->dontSeeJson([
+                "id" => $this->secondAnswer->id
+            ]);
+    }
+}

domains/Discussions/routes.php

@@ -1,6 +1,7 @@
 <?php
 
 use Domains\Discussions\Controllers\AnswersStoreController;
+use Domains\Discussions\Controllers\QuestionsGetAnswersController;
 use Domains\Discussions\Controllers\QuestionsDeleteController;
 use Domains\Discussions\Controllers\QuestionsIndexController;
 use Domains\Discussions\Controllers\QuestionsStoreController;
@@ -39,3 +40,8 @@
     'as' => 'questions.view',
     'uses' => QuestionsViewController::class,
 ]);
+
+Route::get('/questions/{id}/answers', [
+    'as' => 'questions.answersList',
+    'uses' => QuestionsGetAnswersController::class
+]);