feat(v2): add household-scoped GET /shopping/{listId} with tests

api/shopping_v2.py

@@ -3,11 +3,17 @@ from __future__ import annotations
 from typing import Dict
 
 import aiosqlite
-from fastapi import APIRouter, Depends
+from fastapi import APIRouter, Depends, Request, Response
 
 import shopping
-from api.deps import get_db, get_household_from_slug
-from api.shopping import CurrentShoppingList, _to_ingredient_item, _to_meal_item, _to_shopping_list_out
+from api.deps import error_response, get_db, get_household_from_slug
+from api.shopping import (
+    CurrentShoppingList,
+    PurchasedShoppingList,
+    _to_ingredient_item,
+    _to_meal_item,
+    _to_shopping_list_out,
+)
 
 router = APIRouter(prefix="/households/{householdSlug}/shopping", tags=["shopping-v2"])
 
@@ -57,3 +63,31 @@ async def get_current_shopping_list_scoped(
         ingredients_lookup=ingredients_lookup,
         recipes_lookup=recipes_lookup,
     )
+
+
+@router.get(
+    "/{list_id}",
+    response_model=PurchasedShoppingList,
+    operation_id="getShoppingListV2",
+    summary="Get a purchased shopping list by id (scoped)",
+)
+async def get_shopping_list_scoped(
+    list_id: int,
+    request: Request,
+    household=Depends(get_household_from_slug),
+    conn: aiosqlite.Connection = Depends(get_db),
+) -> PurchasedShoppingList | Response:
+    hid = household["id"]
+    shopping_list = await shopping.load_shopping_list_scoped(conn, list_id, hid)
+    if not shopping_list:
+        return error_response(request, 404, "Shopping list not found")
+
+    meals_lookup, recipes_lookup, ingredients_lookup = await shopping.to_lookups(
+        conn, shopping_list.items
+    )
+    return PurchasedShoppingList(
+        list=_to_shopping_list_out(shopping_list),
+        meals_lookup=meals_lookup,
+        recipes_lookup=recipes_lookup,
+        ingredients_lookup=ingredients_lookup,
+    )

backend-spec.md

@@ -1,3 +1,6 @@
+## 0.4 Validated behaviors and invariants
+  - GET `/api/v1/households/{householdSlug}/shopping/{listId}` returning purchased list + lookups scoped to household; cross-household returns 404.
+  - Tests: `tests/test_shopping_household_v2.py` verifies isolation of outstanding items; `tests/test_shopping_list_by_id_v2.py` verifies list-by-id scoping (PASS).
 # Backend Specification: Household Multi-Tenancy (v2)
 
 This document has been validated against the current codebase (v1) to ensure the plan captures all required changes. It starts with a concise baseline of what exists today, then details the v2 multi-tenancy/auth refactor with concrete, file-scoped steps and acceptance criteria.

tests/test_shopping_list_by_id_v2.py

@@ -0,0 +1,116 @@
+import unittest
+from fastapi.testclient import TestClient
+
+import main
+from db import connect, create
+from scripts.migration_to_households import run_migration
+
+
+class TestShoppingListByIdV2(unittest.IsolatedAsyncioTestCase):
+    async def asyncSetUp(self):
+        self.conn = await connect(":memory:")
+        await create(self.conn)
+        await run_migration(self.conn)
+
+        async def override_get_db():
+            try:
+                yield self.conn
+            finally:
+                pass
+
+        main.app.dependency_overrides[main.get_db] = override_get_db
+        self.client = TestClient(main.app)
+
+        # Register a user and create two households
+        r = self.client.post(
+            "/api/v1/auth/register",
+            json={"email": "s@test.com", "password": "pw", "displayName": "S"},
+        )
+        assert r.status_code == 200, r.text
+        token = r.json()["accessToken"]
+        self.headers = {"Authorization": f"Bearer {token}"}
+
+        r = self.client.post("/api/v1/households", headers=self.headers, json={"name": "H1"})
+        assert r.status_code == 200, r.text
+        self.h1 = r.json()["slug"]
+        r = self.client.post("/api/v1/households", headers=self.headers, json={"name": "H2"})
+        assert r.status_code == 200, r.text
+        self.h2 = r.json()["slug"]
+
+        # Lookup household ids
+        async with self.conn.execute("SELECT id FROM Household WHERE slug = ?", (self.h1,)) as c:
+            row = await c.fetchone()
+            assert row is not None
+            self.h1_id = int(row[0])
+        async with self.conn.execute("SELECT id FROM Household WHERE slug = ?", (self.h2,)) as c:
+            row = await c.fetchone()
+            assert row is not None
+            self.h2_id = int(row[0])
+
+        # Seed a purchased shopping list in H1 with one item
+        await self.conn.execute(
+            "INSERT INTO ShoppingList (created_date, store_name, purchased_by_id, household_id) VALUES (datetime('now'), '', 1, ?)",
+            (self.h1_id,),
+        )
+        async with self.conn.execute("SELECT last_insert_rowid()") as c:
+            row = await c.fetchone()
+            assert row is not None
+            self.h1_list_id = int(row[0])
+        # Seed ingredient referenced by item
+        await self.conn.execute(
+            "INSERT INTO Ingredient (name, line, unit, quantity, recipe_id, meal_id, household_id) VALUES ('Milk', '1L milk', 'L', 1, NULL, NULL, ?)",
+            (self.h1_id,),
+        )
+        async with self.conn.execute("SELECT last_insert_rowid()") as c:
+            row = await c.fetchone()
+            assert row is not None
+            milk_id = int(row[0])
+        await self.conn.execute(
+            "INSERT INTO ShoppingListItem (ingredient_id, list_id, person_id, created_date, household_id) VALUES (?, ?, 1, datetime('now'), ?)",
+            (milk_id, self.h1_list_id, self.h1_id),
+        )
+
+        # Seed a purchased shopping list in H2 with one item
+        await self.conn.execute(
+            "INSERT INTO ShoppingList (created_date, store_name, purchased_by_id, household_id) VALUES (datetime('now'), '', 1, ?)",
+            (self.h2_id,),
+        )
+        async with self.conn.execute("SELECT last_insert_rowid()") as c:
+            row = await c.fetchone()
+            assert row is not None
+            self.h2_list_id = int(row[0])
+        await self.conn.execute(
+            "INSERT INTO Ingredient (name, line, unit, quantity, recipe_id, meal_id, household_id) VALUES ('Eggs', '12 eggs', 'dozen', 1, NULL, NULL, ?)",
+            (self.h2_id,),
+        )
+        async with self.conn.execute("SELECT last_insert_rowid()") as c:
+            row = await c.fetchone()
+            assert row is not None
+            eggs_id = int(row[0])
+        await self.conn.execute(
+            "INSERT INTO ShoppingListItem (ingredient_id, list_id, person_id, created_date, household_id) VALUES (?, ?, 1, datetime('now'), ?)",
+            (eggs_id, self.h2_list_id, self.h2_id),
+        )
+
+        await self.conn.commit()
+
+    async def asyncTearDown(self):
+        await self.conn.close()
+        main.app.dependency_overrides.clear()
+
+    def test_get_list_scoped_ok_and_404(self):
+        # In-scope fetch
+        resp_ok = self.client.get(
+            f"/api/v1/households/{self.h1}/shopping/{self.h1_list_id}", headers=self.headers
+        )
+        assert resp_ok.status_code == 200, resp_ok.text
+        body = resp_ok.json()
+        assert body["list"]["id"] == self.h1_list_id
+        assert len(body["list"]["items"]) == 1
+
+        # Cross-household should 404
+        resp_404 = self.client.get(
+            f"/api/v1/households/{self.h1}/shopping/{self.h2_list_id}", headers=self.headers
+        )
+        assert resp_404.status_code == 404, resp_404.text
+        assert "application/problem+json" in resp_404.headers.get("content-type", "")