删除外键选择字段中的所有元素 [英] Remove all the elements in a foreign key select field

问题描述

我有一个外键引用，该引用在客户端上显示为选择框，但已预先填充了值。我希望选择框在显示时为空，因为它将由Ajax调用填充。

I have a foreign key reference which shows up as a select box on the client but it is pre-populated with values. I want the select box to be empty when it shows because it will be populated by an Ajax call.

这是我的模型

class RecipeIngredient(models.Model):
    recipe = models.ForeignKey(Recipe)
    ingredient = models.ForeignKey(Ingredient)
    serving_size = models.ForeignKey(ServingSize)
    quantity = models.IntegerField()
    order = models.IntegerField()
    created = models.DateTimeField(auto_now_add = True)
    updated = models.DateTimeField(auto_now = True)

这是我的模型表格

class RecipeIngredientForm(forms.ModelForm):
    class Meta:
        model = RecipeIngredient
        fields = ('ingredient', 'quantity', 'serving_size')
        widgets  = {
            'ingredient': forms.TextInput(attrs={'class' : 'recipe_ingredient'}),
            'quantity': forms.TextInput(),
            'serving_size' : forms.ChoiceField(choices=PLEASE_SELECT, widget=forms.Select()),
        }

我希望 serving_size字段具有我指定的选择，而不是数据库中的任何数据。显然，我得到一个错误

I want the "serving_size" field to have the choices I specified and not any data from the database. Obviously, I get an error

AttributeError: 'ModelChoiceField' object has no attribute 'to_field_name'

有什么想法吗？

推荐答案

Don在字段中不包含 serving_size 。而是自己添加：

Don't include serving_size in fields. Instead add it yourself:

class RecipeIngredientForm(forms.ModelForm):
    serving_size = forms.ChoiceField(..)

尝试一下并告诉它是否可行。

Try this and tell, if it does the trick.

此外，我相信您不应该将 ChoiceField 放入 widgets 中，这不是小部件，

Furthermore, I believe you shouldn't put ChoiceField into widgets, this is not a widget, but a whole field.

EDIT

class RecipeIngredientForm(forms.ModelForm):
    serving_size = forms.ChoiceField(choices=PLEASE_SELECT, widget=forms.Select())

    class Meta:
        serving_size = forms.ChoiceField(choices=PLEASE_SELECT, widget=forms.Select())
        model = RecipeIngredient
        fields = ('ingredient', 'quantity', 'serving_size')
        widgets  = {
            'ingredient': forms.TextInput(attrs={'class' : 'recipe_ingredient'}),
            'quantity': forms.TextInput(),
        }

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