Python 如何根据模型选择创建选择字段

我有一个Django模型，如下所示：

class Property(models.Model):
    id = models.AutoField(unique=True, primary_key=True)
    name = models.CharField(max_length=500)
    desc = models.CharField(max_length=2000)
    residential = 'residential'
    commercial = 'commercial'
    outright = 'outright'
    lease = 'lease'
    empty = ''
    types = ((residential, 'residential'), (commercial, 'commercial'), (outright, 'outright'), (lease, 'lease'), (empty, ''))
    property_type = models.CharField(choices=types, default=empty, max_length=20)

我现在有一个模型，如下所示：

class PostForm(forms.ModelForm):
    name = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter name for Property'}), required=True)
    desc = forms.CharField(widget=forms.Textarea(attrs={'class': 'form-control input-area', 'placeholder': 'Enter a small description', 'rows': '5', 'style': 'resize:none;'}), required=True)
    property_type = forms.CharField(max_length=20, widget=forms.Select(types)) #This is where I want to add the choices available in the Property Model.

我试过这个方法

class PostForm(forms.ModelForm):
    name = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter name for Property'}), required=True)
    desc = forms.CharField(widget=forms.Textarea(attrs={'class': 'form-control input-area', 'placeholder': 'Enter a small description', 'rows': '5', 'style': 'resize:none;'}), required=True)
    residential = 'residential'
    commercial = 'commercial'
    outright = 'outright'
    lease = 'lease'
    empty = ''
    types = ((residential, 'residential'), (commercial, 'commercial'), (outright, 'outright'), (lease, 'lease'), (empty, ''))
    property_type = models.CharField(choices=types, default=empty, max_length=20)

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但是，这给了我一个“tuple”对象没有属性“copy”的错误。通过查看Django文档，我看到了一个解决方案，但我不确定它是如何工作的。如何解决此问题？

在表单中，字段

属性\u type

必须是

ChoiceField

而不是

CharField

查看：

class PostForm(forms.ModelForm):
    name = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control input-area', 'placeholder': 'Enter name for Property'}), required=True)
    desc = forms.CharField(widget=forms.Textarea(attrs={'class': 'form-control input-area', 'placeholder': 'Enter a small description', 'rows': '5', 'style': 'resize:none;'}), required=True)
    residential = 'residential'
    commercial = 'commercial'
    outright = 'outright'
    lease = 'lease'
    empty = ''
    types = ((residential, 'residential'), (commercial, 'commercial'), (outright, 'outright'), (lease, 'lease'), (empty, ''))
    property_type = models.ChoiceField(choices=types, default=empty, max_length=20)