working 3 tier approach

backend/app/api/tiers.py

@@ -0,0 +1,66 @@
+from typing import Optional
+
+from fastapi import APIRouter, Depends
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.database import get_session
+from app.models import DonationTier
+from app.schemas import TierCreate, TierUpdate, TierResponse
+
+router = APIRouter()
+
+
+@router.get("/", response_model=list[TierResponse])
+async def list_tiers(session: AsyncSession = Depends(get_session)):
+    result = await session.execute(
+        select(DonationTier).order_by(DonationTier.display_order)
+    )
+    return list(result.scalars().all())
+
+
+@router.get("/{tier_id}", response_model=TierResponse)
+async def get_tier(tier_id: int, session: AsyncSession = Depends(get_session)):
+    result = await session.execute(select(DonationTier).where(DonationTier.id == tier_id))
+    tier = result.scalar_one_or_none()
+    if not tier:
+        return {"error": "Tier not found"}
+    return tier
+
+
+@router.post("/", response_model=TierResponse, status_code=201)
+async def create_tier(
+    payload: TierCreate, session: AsyncSession = Depends(get_session)
+):
+    tier = DonationTier(**payload.model_dump())
+    session.add(tier)
+    await session.commit()
+    await session.refresh(tier)
+    return tier
+
+
+@router.put("/{tier_id}", response_model=TierResponse)
+async def update_tier(
+    tier_id: int,
+    payload: TierUpdate,
+    session: AsyncSession = Depends(get_session),
+):
+    result = await session.execute(select(DonationTier).where(DonationTier.id == tier_id))
+    tier = result.scalar_one_or_none()
+    if not tier:
+        return {"error": "Tier not found"}
+    for key, value in payload.model_dump(exclude_unset=True).items():
+        setattr(tier, key, value)
+    await session.commit()
+    await session.refresh(tier)
+    return tier
+
+
+@router.delete("/{tier_id}", status_code=204)
+async def delete_tier(tier_id: int, session: AsyncSession = Depends(get_session)):
+    result = await session.execute(select(DonationTier).where(DonationTier.id == tier_id))
+    tier = result.scalar_one_or_none()
+    if not tier:
+        return {"error": "Tier not found"}
+    await session.delete(tier)
+    await session.commit()