Raise validation error in inline field Django

问题

I have a model that contains a TabularInline, and I want to raise a validation error when a condition is not valid. My parent model:

@admin.register(Even)
class EventAdmin(admin.ModelAdmin):
    list_display = ['id', 'title']
    list_display_links = ['id', 'title]
    inlines = [EventSpecialPriceInline]

And my TabularInline:

class EventSpecialPriceInline(admin.TabularInline):
    model = EventSpecialPrice
    extra = 0
    can_delete = True

The error I want to raise is when a price of a row is negative EventSpecialPrice.price < 0

回答1:

You could use MinValueValidator for your model field

class EventSpecialPrice(models.Model)
    price = models.FloatField(validators=[MinValueValidator(0)])

回答2:

I've added a BaseInlineFormSet and used form.clean:

from django.core.exceptions import ValidationError
from django.forms.models import BaseInlineFormSet

class EventSpecialPriceInlineFormSet(BaseInlineFormSet):
    def clean(self):
        super(EventSpecialPriceInlineFormSet, self).clean()
        for form in self.forms:
            if form.cleaned_data and not form.cleaned_data.get('DELETE', False):
                if form.cleaned_data.get('price') < 0:
                    raise ValidationError('Price should be positive')

And in my TabularInline I've defined a formset:

class EventSpecialPriceInline(admin.TabularInline):
    model = EventSpecialPrice
    formset = EventSpecialPriceInlineFormSet
    extra = 0
    can_delete = True

来源：https://stackoverflow.com/questions/53535051/raise-validation-error-in-inline-field-django