better drink dependency

drink_ingredient has name and cost_per_volume
Flaschengeist/flaschengeist-pricelist#2

flaschengeist/plugins/pricelist/models.py

@@ -76,16 +76,17 @@ class DrinkIngredient(db.Model, ModelSerializeMixin):
     id: int = db.Column("id", db.Integer, primary_key=True)
     volume: float = db.Column(db.Numeric(precision=5, scale=2, asdecimal=False), nullable=False)
     ingredient_id: int = db.Column(db.Integer, db.ForeignKey("drink.id"))
-    #    drink_ingredient: Drink = db.relationship("Drink")
-    # price: float = 0
+    cost_per_volume: float
+    name: str
+    _drink_ingredient: Drink = db.relationship("Drink")
 
+    @property
+    def cost_per_volume(self):
+        return self._drink_ingredient.cost_per_volume if self._drink_ingredient else None
 
-#    @property
-#    def price(self):
-#        try:
-#            return self.drink_ingredient.cost_price_pro_volume * self.volume
-#        except AttributeError:
-#            pass
+    @property
+    def name(self):
+        return self._drink_ingredient.name if self._drink_ingredient else None
 
 
 class Ingredient(db.Model, ModelSerializeMixin):

flaschengeist/plugins/pricelist/pricelist_controller.py

@@ -315,6 +315,10 @@ def delete_price(identifier):
 def set_drink_ingredient(data):
     allowed_keys = DrinkIngredient().serialize().keys()
     values = {key: value for key, value in data.items() if key in allowed_keys}
+    if "cost_per_volume" in values:
+        values.pop("cost_per_volume")
+    if "name" in values:
+        values.pop("name")
     ingredient_id = values.pop("id", -1)
     if ingredient_id < 0:
         drink_ingredient = DrinkIngredient(**values)