Django管理表单验证

Question

In my django app, I want to add a validation to the automatically generated admin form of a model. I want to raise a ValidationError if the attribute title equals "test". I have tried the following in admin.py , but nothing happens if the title is "test". Could anyone help, please?

from django.contrib import admin
from django.forms import ModelForm, ValidationError

from .models import MyModel

class MyModelAdminForm(ModelForm):
    class Meta:
        model = MyModel
        fields = '__all__'

    def clean(self):
        cleaned_data = super().clean()
        title = cleaned_data.get('title')
        if title == 'test':
            raise forms.ValidationError('invalid!')
        return cleaned_data

class MyModelAdmin(admin.ModelAdmin):
    form = MyModelAdminForm

admin.site.register(MyModel)

Answer 1

You have not register the MyModel model with the MyModelAdmin class. You do that with:

admin.site.register(MyModel, MyModelAdmin)

Also, because the clean method checks only one field ( title ), you should use the method clean_title and raise the ValidationError inside there. No need for clean() .

Example:

def clean_title(self):
    title = self.cleaned_data['title']
    if title == 'test':
        raise forms.ValidationError('invalid!')
    return title