fix unique between attachment and topic

fet2020/intern/models.py

@@ -86,7 +86,7 @@ class Topic(models.Model):
 class Attachment(models.Model):
     title = models.CharField(verbose_name="Titel", max_length=128)
 
-    shortterm = models.CharField(max_length=10, unique=True)
+    shortterm = models.CharField(max_length=10)
     slug = models.SlugField(max_length=10)
 
     description = models.TextField(null=True, blank=True)

fet2020/intern/views.py

@@ -165,6 +165,7 @@ class TopicCreateView(LoginRequiredMixin, CreateView):
     def get_initial(self):
         self.slug = self.kwargs.get("topic_group")
 
+
 class TopicUpdateView(LoginRequiredMixin, UpdateView):
     model = Topic
     template_name = "intern/topic/topic_update.html"
@@ -232,7 +233,9 @@ class AttachmentUpdateView(LoginRequiredMixin, UpdateView):
         context["topic_slug"] = self.topic_slug
         context["slug"] = self.slug
 
-        attachment = Attachment.objects.filter(slug=self.slug).first()
+        attachment = Attachment.objects.filter(
+            Q(slug=self.slug) & Q(topic__slug=self.topic_slug)
+        ).first()
         context["attachment"] = attachment
         return context
 
@@ -266,7 +269,9 @@ class EtherpadCreateView(LoginRequiredMixin, CreateView):
         context["topic_slug"] = self.topic_slug
         context["slug"] = self.slug
 
-        attachment = Attachment.objects.filter(slug=self.slug).first()
+        attachment = Attachment.objects.filter(
+            Q(slug=self.slug) & Q(topic__slug=self.topic_slug)
+        ).first()
         context["attachment"] = attachment
 
         return context
@@ -298,7 +303,9 @@ class FileUploadCreateView(LoginRequiredMixin, CreateView):
         context["topic_slug"] = self.topic_slug
         context["slug"] = self.slug
 
-        attachment = Attachment.objects.filter(slug=self.kwargs.get("slug")).first()
+        attachment = Attachment.objects.filter(
+            Q(slug=self.slug) & Q(topic__slug=self.topic_slug)
+        ).first()
         context["attachment"] = attachment
 
         return context