implement model changes

- add new domains.apps.AppConfig to allow translatable app description for
  domains app
- link domains to a customer
- extract common functionality from domains.models.MailDomain into abstract
  domains.models.DomainBase
- add separate domains.models.HostingDomain to allow for generic external
  domains
- add new hostingpackages.models.CustomerHostingPackageDomain to assign hosting
  domains to hosting packages

gnuviechadmin/hostingpackages/migrations/0004_customerhostingpackagedomain.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+import django.utils.timezone
+import model_utils.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('domains', '0002_auto_20150124_1909'),
+        ('hostingpackages', '0003_auto_20150118_1407'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CustomerHostingPackageDomain',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('created', model_utils.fields.AutoCreatedField(default=django.utils.timezone.now, verbose_name='created', editable=False)),
+                ('modified', model_utils.fields.AutoLastModifiedField(default=django.utils.timezone.now, verbose_name='modified', editable=False)),
+                ('domain', models.OneToOneField(verbose_name='hosting domain', to='domains.HostingDomain')),
+                ('hosting_package', models.ForeignKey(related_name='domains', verbose_name='hosting package', to='hostingpackages.CustomerHostingPackage')),
+            ],
+            options={
+                'abstract': False,
+            },
+            bases=(models.Model,),
+        ),
+    ]

gnuviechadmin/hostingpackages/models.py

@@ -14,6 +14,7 @@ from django.utils.translation import ugettext_lazy as _, ungettext
 from model_utils import Choices
 from model_utils.models import TimeStampedModel
 
+from domains.models import HostingDomain
 from managemails.models import Mailbox
 from osusers.models import (
     AdditionalGroup,
@@ -66,6 +67,7 @@ class HostingOption(TimeStampedModel):
 
     """
 
+
 @python_2_unicode_compatible
 class DiskSpaceOptionBase(models.Model):
     diskspace = models.PositiveIntegerField(_('disk space'))
@@ -83,6 +85,7 @@ class DiskSpaceOptionBase(models.Model):
         return _("Additional disk space {space} {unit}").format(
             space=self.diskspace, unit=self.get_diskspace_unit_display())
 
+
 class DiskSpaceOption(DiskSpaceOptionBase, HostingOption):
     """
     This is a class for hosting options adding additional disk space to
@@ -329,6 +332,30 @@ class CustomerHostingPackage(HostingPackageBase):
         return super(CustomerHostingPackage, self).save(*args, **kwargs)
 
 
+@python_2_unicode_compatible
+class CustomerHostingPackageDomain(TimeStampedModel):
+    """
+    This class defines the relationship from a hosting package to a hosting
+    domain.
+
+    """
+    hosting_package = models.ForeignKey(
+        CustomerHostingPackage, verbose_name=_('hosting package'),
+        related_name='domains')
+    domain = models.OneToOneField(
+        HostingDomain, verbose_name=_('hosting domain'))
+
+    def __str__(self):
+        return self.domain.domain
+
+    def is_usable_for_email(self):
+        """
+        Tells wether the related domain is usable for email addresses.
+
+        """
+        return self.domain.maildomain is not None
+
+
 class CustomerHostingPackageOption(TimeStampedModel):
     """
     This class defines options for customer hosting packages.