[collector] can now collect Teile and list them

If a newly entered Teil already exists, we ignore that and do nothing.

"name" could become a primary key...

collector/views.py

@@ -1,5 +1,6 @@
-from django.http import HttpRequest, HttpResponse
+from django.http import HttpRequest, HttpResponse, HttpResponseRedirect
 from django.shortcuts import get_object_or_404, render
+from django.urls import reverse
 
 from .models import Teil
 
@@ -12,6 +13,20 @@ def index(request: HttpRequest) -> HttpResponse:
     return render(request, "collector/index.html", context)
 
 
+def list_all(request: HttpRequest) -> HttpResponse:
+    teile_list = Teil.objects.order_by("-modified")
+    return render(request, "collector/index.html", {"teile_list": teile_list})
+
+
 def detail(request: HttpRequest, teil_id) -> HttpResponse:
     teil = get_object_or_404(Teil, pk=teil_id)
     return render(request, "collector/detail.html", {"teil": teil})
+
+
+def enter(request: HttpRequest) -> HttpResponse:
+    try:
+        Teil.objects.create(name=request.POST["new_name"])
+    except Exception:
+        pass
+
+    return HttpResponseRedirect(reverse("collector:index"))