Allow negative stock

Author: soundstorm

.env.example

@@ -30,6 +30,9 @@ BASE_URL=http://localhost:8000 # Also adjust this to your production url
 # (restricts user creation endpoint to these devices)
 CHECKOUT_BOX_SLUGS=nfckasse
 
+# Optional: allow purchases when stock is 0 (stock goes negative, default: false)
+# ALLOW_NEGATIVE_STOCK=false
+
 # Currency symbol appended to all monetary amounts in API messages and PDF statements (default: €)
 CURRENCY=€
 

app/api/v1/products.py

@@ -11,6 +11,7 @@
     require_checkout_device,
     require_product_manager_user,
 )
+from app.config import settings
 from app.auth.oidc import is_product_manager
 from app.database import get_db
 from app.models.machine import Machine
@@ -345,7 +346,7 @@ def purchase_product(
     product = _resolve_product(ean, db)
     if not product.active:
         raise HTTPException(status_code=400, detail="Product is not active")
-    if product.stock <= 0:
+    if product.stock <= 0 and not settings.ALLOW_NEGATIVE_STOCK:
         raise HTTPException(status_code=400, detail="Product out of stock")
 
     user = db.execute(

app/config.py

@@ -27,6 +27,9 @@ class Settings(BaseSettings):
     # Devices
     CHECKOUT_BOX_SLUGS: str = ""
 
+    # Allow purchases when stock is 0 (stock goes negative)
+    ALLOW_NEGATIVE_STOCK: bool = False
+
     # PDF statement generation (typst)
     # Directory containing extra fonts (e.g. albertsans.ttf). Leave empty to use system fonts only.
     TYPST_FONT_DIR: str = ""