How to call in django admin "Field is required"?

Question

Django

Hello!
How in django admin to cause a situation similar to when we try to save an instance in the admin without filling in a field that is required?

Answer 1

The most correct way is to redefine the form and check the necessary condition in it:

class SomeForm(forms.ModelForm):
    class Meta:
        model = SomeModel
        fields = ['some_field', 'another_field', 'one_more_field']

    def clean(self):
        if проверка условия:
            raise forms.ValidationError('Существует инстанс модели с некоторыми параметрами!')


class SomeInline(admin.TabularInline):
    model = Book
    form = SomeForm

Or you can perform the same operation in ModelAdmin.save_formset() :

class AnotherModel(admin.ModelAdmin):
    ...

    def save_formset(self, request, form, formset, change):
        instances = formset.save(commit=False)
        for instance in instances:
            if  проверка условия:
                raise forms.ValidationError('Существует инстанс модели с некоторыми параметрами!')
        ...

But not recommended.