54 lines
1.5 KiB
Python
54 lines
1.5 KiB
Python
from __future__ import annotations
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from typing import List, Set
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from persons import Person
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from meals.db import Meal
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def get_duplicates(items: List[Person]) -> Set[str]:
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"""Return the set of duplicate person names based on repeated ids."""
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seen: set[int] = set()
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duplicates: set[str] = set()
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for item in items:
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if item.id in seen:
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duplicates.add(item.name)
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seen.add(item.id)
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return duplicates
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def validate_meal(meal: Meal) -> str | None:
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"""Validate a Meal domain model.
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Returns:
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None if valid, otherwise a human-readable error message.
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"""
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if not meal.chefs:
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return "Meal must have at least one chef"
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if not meal.cleanup:
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return "Meal must have at least one cleanup person"
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if not meal.consumers:
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return "Meal must have at least one consumer"
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if len(meal.recipes) == 0 and len(meal.extra_ingredients) == 0:
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return "Meal must have at least one recipe or ingredient"
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duplicates = get_duplicates(meal.chefs)
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if duplicates:
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return f"Duplicate chef: {', '.join(duplicates)}"
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duplicates = get_duplicates(meal.cleanup)
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if duplicates:
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return f"Duplicate cleanup person: {', '.join(duplicates)}"
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duplicates = get_duplicates(meal.consumers)
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if duplicates:
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return f"Duplicate consumer: {', '.join(duplicates)}"
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zero_servings = [r for r in meal.recipes if r.servings == 0]
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if zero_servings:
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return "Recipe servings must be greater than 0"
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return None
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