Django 기반 웹 개발(4)

레시피를 수정할 때, 이미 등록된 재료를 수정하거나 삭제하는 기능 구현

재료 수정

ingredient_names = request.POST.getlist('ingredient_name[]')
ingredient_quantities = request.POST.getlist('ingredient_quantity[]')
ingredient_units = request.POST.getlist('ingredient_unit[]')

for name, quantity, unit in zip(ingredient_names, ingredient_quantities, ingredient_units):
    ingredient, created = Ingredient.objects.get_or_create(name=name)
    defaults = {
        'quantity': quantity,
        'unit': unit
    }
    RecipeIngredient.objects.update_or_create(
        recipe=recipe,
        ingredient=ingredient,
        defaults=defaults
    )

RecipeIngredient.objects.update_or_create()에서 recipe와 ingredient 기준으로 데이터를 확인하여 이미 데이터베이스에 존재하면 default로 업데이터하고 존재하지 않으면 새로 생성한다.

update_or_create 문서

재료 삭제

ingredient_names = request.POST.getlist('ingredient_name[]')
ingredient_quantities = request.POST.getlist('ingredient_quantity[]')
ingredient_units = request.POST.getlist('ingredient_unit[]')

ingredients = []
for name, quantity, unit in zip(ingredient_names, ingredient_quantities, ingredient_units):
    # 재료 수정 생략
    ingredients.append(ingredient)

recipe_ingredient_to_delete = RecipeIngredient.objects.filter(
    recipe=recipe
).exclude(
    Q(ingredient__in=ingredients)
)
recipe_ingredient_to_delete.delete()

exclude 문서
Q 문서

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