獨立於__str__返回ModelChoiceField的多個值

Question

我有models.py作為：

class FoodCategory(models.Model):
    category = models.CharField(max_length = 50)
    content = models.CharField(max_length= 50, null = True,blank=True)
    preparation = models.CharField(max_length= 50, null=True, blank=True)
    time = models.CharField(max_length=50,null=True, blank=True)
    def __str__(self):
        return '%s %s %s %s' % (self.category, self.content, self.preparation, self.time)

現在我已經從django管理站點中填寫了FoodCategory的一些值，並且需要將這些值顯示為下拉字段，即類別的下拉字段，內容的另一個下拉字段以及用於准備和時間的類似字段。

我的forms.py如下：

class FoodForm(forms.ModelForm):
    category = forms.ModelChoiceField(queryset=Category.objects.all())
    time = forms.ModelChoiceField(queryset=Category.objects.all())
    preparation = forms.ModelChoiceField(queryset=Category.objects.all())
    content = forms.ModelChoiceField(queryset=Category.objects.all())
    class Meta:
        model = FoodItems
        fields = ('name','time', 'category', 'content', 'preparation', 'comment',)

但是現在所有下拉字段都顯示為：

我需要將Starter-Soup，Veg，American，Breakfast分別分類為類別，內容，准備，時間

所以我認為問題在於__str__的返回值。 如何單獨退還？

Answer 1

您可以通過創建自定義modelchoice字段來實現：

class CategoryModelChoiceField(ModelChoiceField):
    def label_from_instance(self, obj):
        return obj.category

class TimeModelChoiceField(ModelChoiceField):
    def label_from_instance(self, obj):
        return obj.time

class PreparationModelChoiceField(ModelChoiceField):
    def label_from_instance(self, obj):
        return obj.preparation

class ContentModelChoiceField(ModelChoiceField):
    def label_from_instance(self, obj):
        return obj.content

form.py：

class FoodForm(forms.ModelForm):
    category = CategoryModelChoiceField(queryset=Category.objects.all())
    time = TimeModelChoiceField(queryset=Category.objects.all())
    preparation = PreparationModelChoiceField(queryset=Category.objects.all())
    content = ContentModelChoiceField(queryset=Category.objects.all())
    class Meta:
        model = FoodItems
        fields = ('name','time', 'category', 'content', 'preparation', 'comment',)