Fix create trade offer flow and other related bugs

cards/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 5.1.2 on 2025-03-20 00:08
+# Generated by Django 5.1.2 on 2025-03-22 04:08
 
 import django.db.models.deletion
 from django.db import migrations, models

cards/urls.py

@@ -1,5 +1,14 @@
 from django.urls import path
+from .views import (
+    CardDetailView,
+    TradeOfferHaveCardListView,
+    TradeOfferWantCardListView,
+)
 
+app_name = "cards"
 
 urlpatterns = [
+    path('<int:pk>/', CardDetailView.as_view(), name='card_detail'),
+    path('<int:pk>/trade-offers-have/', TradeOfferHaveCardListView.as_view(), name='card_trade_offer_have_list'),
+    path('<int:pk>/trade-offers-want/', TradeOfferWantCardListView.as_view(), name='card_trade_offer_want_list'),
 ]

cards/views.py

@@ -1,4 +1,64 @@
 from django.views.generic import TemplateView
 from django.urls import reverse_lazy
 from django.views.generic import UpdateView, DeleteView, CreateView, ListView, DetailView
+from cards.models import Card
+from trades.models import TradeOffer
+
+class CardDetailView(DetailView):
+    model = Card
+    template_name = "cards/card_detail.html"
+    context_object_name = "card"
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        card = self.get_object()
+        # Count of trade offers where the card appears as a "have" in a trade.
+        context['trade_offer_have_count'] = TradeOffer.objects.filter(
+            trade_offer_have_cards__card=card
+        ).distinct().count()
+        # Count of trade offers where the card appears as a "want" in a trade.
+        context['trade_offer_want_count'] = TradeOffer.objects.filter(
+            trade_offer_want_cards__card=card
+        ).distinct().count()
+        return context
+
+
+class TradeOfferHaveCardListView(ListView):
+    model = TradeOffer
+    template_name = "cards/_trade_offer_list.html"
+    context_object_name = "trade_offers"
+    paginate_by = 2
+
+    def get_queryset(self):
+        card_id = self.kwargs.get("pk")
+        order_param = self.request.GET.get("order", "newest")
+        ordering = "-updated_at" if order_param == "newest" else "updated_at"
+        return TradeOffer.objects.filter(
+            trade_offer_have_cards__card_id=card_id
+        ).order_by(ordering).distinct()
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context['side'] = 'have'
+        return context
+
+
+class TradeOfferWantCardListView(ListView):
+    model = TradeOffer
+    template_name = "cards/_trade_offer_list.html"
+    context_object_name = "trade_offers"
+    paginate_by = 2
+
+    def get_queryset(self):
+        card_id = self.kwargs.get("pk")
+        order_param = self.request.GET.get("order", "newest")
+        ordering = "-updated_at" if order_param == "newest" else "updated_at"
+        return TradeOffer.objects.filter(
+            trade_offer_want_cards__card_id=card_id
+        ).order_by(ordering).distinct()
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context['side'] = 'want'
+        return context