def all_ids_must_exist(cls, sub_meals):
ids = [meal for meal in sub_meals if isinstance(meal, int)]
meals = Meal.select().where(Meal.id.in_(ids))
existing_ids = {meal.id for meal in meals}
missing_ids = set(ids) - existing_ids
if len(meals) != len(ids):
raise ValueError(f"Meal ids {missing_ids} do not exist.")
for meal in meals:
# we need to make sure that sub-meals used in other meal-trees are not
# stolen from there, so we make a copy by removing the id.
meal.id = None
return meals
def get_meals():
return list(Meal.select())
