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52 lines
1.7 KiB
52 lines
1.7 KiB
9 years ago
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# -*- coding: utf-8 -*-
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from __future__ import unicode_literals
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# Erik Stein <code@classlibrary.net>, 2016
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from django import forms
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from django.contrib import admin
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from django.utils.translation import ugettext_lazy as _
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# from http://stackoverflow.com/questions/877723/inline-form-validation-in-django#877920
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class MandatoryInlineFormSet(forms.models.BaseInlineFormSet):
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"""
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Make sure at least one inline form is valid.
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"""
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mandatory_error_message = _("Bitte mindestens %(min_num)s %(name)s angeben.")
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def is_valid(self):
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return super(MandatoryInlineFormSet, self).is_valid() and \
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not any([bool(e) for e in self.errors])
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def clean(self):
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# get forms that actually have valid data
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count = 0
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for form in self.forms:
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try:
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if form.cleaned_data and not form.cleaned_data.get('DELETE', False):
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count += 1
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except AttributeError:
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# annoyingly, if a subform is invalid Django explicity raises
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# an AttributeError for cleaned_data
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pass
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if count < self.min_num:
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if self.min_num > 1:
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name = self.model._meta.verbose_name_plural
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else:
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name = self.model._meta.verbose_name
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raise forms.ValidationError(
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self.mandatory_error_message % {
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'min_num': self.min_num,
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'name': name,
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}
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)
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class MandatoryTabularInline(admin.TabularInline):
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formset = MandatoryInlineFormSet
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class MandatoryStackedInline(admin.StackedInline):
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formset = MandatoryInlineFormSet
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