# -*- coding: utf-8 -*-
from django.db import models

from .invoice import Invoice
from .. import consts


class SignedStatusFieldMixin(models.Model):
    """Mixin: добавляет поле `Подписан?`"""
    signed_status = models.BooleanField(u'Подписан?', choices=consts.BOOL_CHOICES, default=False)

    class Meta:
        abstract = True


class InvoiceFieldMixin(models.Model):
    """Mixin: добавляет FK поле `Создать по счёту`"""
    invoice = models.ForeignKey(Invoice, related_name='+', verbose_name=u'Создать по счёту', blank=True, null=True,
        default=None)

    class Meta:
        abstract = True