如何在過濾數據時在django過濾器中設置選項'All'

Question

我正在開發一個django應用程序，可以根據食譜過濾配料。我使用Django過濾器來給我的用戶過濾選項。我的過濾下拉菜單工作得很好，但我想添加一個選項'全部'，提交時應列出所有配料，而不管其配方如何。

這裏是我的代碼：

#models.py 

class Recipe(models.Model): 
    user = models.ForeignKey('auth.User') 
    title = models.CharField(max_length=500) 
    description = models.TextField(max_length=500) 
    rules = models.TextField(max_length=500,blank=True) 
    def __str__(self): 
      return self.title 
class Ingredient(models.Model): 
    user = models.ForeignKey('auth.User') 
    recipe_id = models.ForeignKey(Recipe, on_delete=models.CASCADE) 
    title = models.CharField(max_length=500) 
    instructions = models.CharField(max_length=500) 
    rules = models.TextField(max_length=500,blank=True) 
    primal = models.CharField(default='0',max_length=500,blank=True) 
    def __str__(self): 
      return self.title 

#forms.py 

class RecipeFilter(django_filters.FilterSet): 
    class Meta: 
     model = Ingredient 
     fields = ['recipe_id'] 

#views.py 

def ingredient_list(request): 
    ingredientfilter = IngredientFilter(queryset=Recipe.objects.filter(user = request.user)) 
    if request.method == 'GET' and 'recipe_id' in request.GET: 
     recipe_id=request.GET['recipe_id']; 
     ingredients = Ingredient.objects.filter(recipe_id= recipe_id) 
     selected_combo_value = Recipe.objects.get(pk=recipe_id) 
     return render(request, 'ingredient_list.html',{'ingredients':ingredients, 'ingredientfilter': ingredientfilter,'selected_combo_value':selected_combo_value }) 
    else: 
     ingredients = Ingredient.objects.filter(user = request.user) 
    return render(request, 'ingredient_list.html',{'ingredients':ingredients, 'ingredientfilter': ingredientfilter }) 

任何想法，該怎麼辦呢？

Answer 1

這是一個已知issue。解決方法是重寫篩選器的選項。

class RecipeFilter(django_filters.FilterSet): 
    def __init__(self, *args, **kwargs): 
     super(RecipeFilter, self).__init__(*args, **kwargs) 
     self.filters['recipe_id'].field.choices.insert(0, ('', u'---------'))