Fix cross-DB query: market app cart_items via data endpoint

market_context() was querying CartItem directly via g.s (db_market),
but cart_items lives in db_cart. Replace with fetch_data("cart",
"cart-items") and add the corresponding data endpoint.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cart/bp/data/routes.py

@@ -80,4 +80,36 @@ def register() -> Blueprint:
 
     _handlers["page-config-ensure"] = _page_config_ensure
 
+    # --- cart-items (product slugs + quantities for template rendering) ---
+    async def _cart_items():
+        from sqlalchemy import select
+        from sqlalchemy.orm import selectinload
+        from shared.models.market import CartItem
+
+        user_id = request.args.get("user_id", type=int)
+        session_id = request.args.get("session_id")
+
+        filters = [CartItem.deleted_at.is_(None)]
+        if user_id is not None:
+            filters.append(CartItem.user_id == user_id)
+        elif session_id is not None:
+            filters.append(CartItem.session_id == session_id)
+        else:
+            return []
+
+        result = await g.s.execute(
+            select(CartItem).where(*filters).options(selectinload(CartItem.product))
+        )
+        items = result.scalars().all()
+        return [
+            {
+                "product_id": item.product_id,
+                "product_slug": item.product.slug if item.product else None,
+                "quantity": item.quantity,
+            }
+            for item in items
+        ]
+
+    _handlers["cart-items"] = _cart_items
+
     return bp

market/app.py

@@ -26,8 +26,6 @@ async def market_context() -> dict:
     from shared.infrastructure.fragments import fetch_fragments
     from shared.infrastructure.data_client import fetch_data
     from shared.contracts.dtos import CartSummaryDTO, dto_from_dict
-    from shared.models.market import CartItem
-    from sqlalchemy.orm import selectinload
 
     ctx = await base_context()
 
@@ -64,20 +62,21 @@ async def market_context() -> dict:
     ctx["auth_menu_html"] = auth_menu_html
     ctx["nav_tree_html"] = nav_tree_html
 
-    # ORM cart items for product templates (need .product relationship)
-    filters = [CartItem.deleted_at.is_(None)]
-    if ident["user_id"] is not None:
-        filters.append(CartItem.user_id == ident["user_id"])
-    elif ident["session_id"] is not None:
-        filters.append(CartItem.session_id == ident["session_id"])
+    # Cart items for product templates — fetched via internal data endpoint
+    # (cart_items table lives in db_cart, not db_market)
+    cart_items_raw = await fetch_data("cart", "cart-items", params=summary_params, required=False)
+    if cart_items_raw:
+        # Wrap as namespace objects so Jinja selectattr("product.slug", ...) works
+        from types import SimpleNamespace
+        ctx["cart"] = [
+            SimpleNamespace(
+                product=SimpleNamespace(slug=item["product_slug"]),
+                quantity=item["quantity"],
+            )
+            for item in cart_items_raw
+        ]
     else:
         ctx["cart"] = []
-        return ctx
-
-    result = await g.s.execute(
-        select(CartItem).where(*filters).options(selectinload(CartItem.product))
-    )
-    ctx["cart"] = list(result.scalars().all())
 
     return ctx