feat(diary): make create comment interactor

apps/diaries/interactors.py

@@ -7,7 +7,7 @@
 
 from rp2.business_logic import COMMIT_MIN_LENGTH
 
-from .models import Diary, DiaryCommit
+from .models import Diary, DiaryCommit, DiaryComment
 from .signals import diary_commit_created
 
 
@@ -59,3 +59,42 @@ def create_commit(request, diary_id: int):
     diary_commit_created.send(sender=DiaryCommit, instance=diary_commit)
 
     return redirect("diaries:detail_view", diary.id)
+
+
+@login_required
+def create_comment(request, diary_id: int):
+
+    # ===== DTO
+
+    body = request.POST.get("body", "").strip()
+    diary = Diary.objects.get(id=diary_id)
+
+    # ===== VALIDATION
+
+    if (
+        DiaryComment.objects
+        .filter(
+            diary=diary,
+            body=body,
+            created_datetime__date=datetime.date.today()
+        )
+        .exists()
+    ):
+        messages.error(request, message="this message already exists for today")
+        return redirect(
+            f"{reverse(viewname='diaries:detail_view', kwargs={'id': diary.id})}"
+            f"?body={body}"
+        )
+
+    # ===== PROCESS
+
+    diary_comment = DiaryComment()
+    diary_comment.diary = diary
+    diary_comment.author = request.user.account
+    diary_comment.body = body
+    diary_comment.save()
+
+    diary.comments_last_read_by = request.user.account
+    diary.save(update_fields=["comments_last_read_by"])
+
+    return redirect("diaries:detail_view", diary.id)

apps/diaries/migrations/0005_diary_comments_last_read_by_alter_diarycomment_diary.py

@@ -0,0 +1,25 @@
+# Generated by Django 4.2.6 on 2023-12-26 16:59
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('accounts', '0005_delete_xp'),
+        ('diaries', '0004_alter_diary_account'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='diary',
+            name='comments_last_read_by',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='accounts.account'),
+        ),
+        migrations.AlterField(
+            model_name='diarycomment',
+            name='diary',
+            field=models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='comments', to='diaries.diary'),
+        ),
+    ]

apps/diaries/models.py

@@ -9,6 +9,7 @@
 class Diary(models.Model):
 
     account = models.ForeignKey(Account, on_delete=models.CASCADE, related_name="diaries")
+    comments_last_read_by = models.ForeignKey(Account, on_delete=models.CASCADE, blank=True, null=True)
     created_date = models.DateField(default=timezone.now)
 
     class Meta:
@@ -37,7 +38,7 @@ def __str__(self):
 
 class DiaryComment(models.Model):
 
-    diary = models.ForeignKey(Diary, on_delete=models.CASCADE)
+    diary = models.ForeignKey(Diary, on_delete=models.CASCADE, related_name="comments")
     author = models.ForeignKey(Account, on_delete=models.CASCADE)
     body = models.TextField()
     created_datetime = models.DateTimeField(default=timezone.now)