Поправил связи ForeignKey чтоб не удалялись важные даннные по SQL CASCADE

abonapp/migrations/0017_auto_20170416_1029.py

@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9 on 2017-04-16 07:29
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('abonapp', '0016_auto_20170415_1311'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='invoiceforpayment',
+            name='author',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='+', to=settings.AUTH_USER_MODEL),
+        ),
+    ]

abonapp/models.py

@@ -360,7 +360,7 @@ class InvoiceForPayment(models.Model):
     comment = models.CharField(max_length=128)
     date_create = models.DateTimeField(auto_now_add=True)
     date_pay = models.DateTimeField(blank=True, null=True)
-    author = models.ForeignKey(UserProfile, related_name='+')
+    author = models.ForeignKey(UserProfile, related_name='+', on_delete=models.C, blank=True, null=True)
 
     def __str__(self):
         return "%s -> %.2f" % (self.abon.username, self.amount)

accounts_app/migrations/0006_auto_20170416_1029.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9 on 2017-04-16 07:29
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('accounts_app', '0005_auto_20170222_2224'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='userprofile',
+            name='avatar',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='photo_app.Photo'),
+        ),
+    ]

accounts_app/models.py

@@ -53,7 +53,7 @@ class UserProfile(AbstractBaseUser, PermissionsMixin):
         #unique=True,
         validators=[RegexValidator('^\+[7,8,9,3]\d{10,11}$')]
     )
-    avatar = models.ForeignKey(Photo, null=True, blank=True)
+    avatar = models.ForeignKey(Photo, null=True, blank=True, on_delete=models.SET_NULL)
     email = models.EmailField(default='admin@example.ru')
 
     USERNAME_FIELD = 'username'

photo_app/models.py

@@ -33,10 +33,14 @@ class Photo(models.Model):
         im = Image.open(self.image.path)
         im.thumbnail((759, 759), Image.ANTIALIAS)
 
-        hs = hashlib.md5(str(time.time())).hexdigest()
+        hs = hashlib.md5(str(time.time()).encode()).hexdigest()
         ext = self.image.path.split('.')[1:][0]
-        fname = "%s/media/%s.%s" % (BASE_DIR, hs, ext)
-
+        path = "%s/media" % BASE_DIR
+        fname = "%s/%s.%s" % (path, hs, ext)
+        if not os.path.exists(path):
+            os.makedirs(path)
+        if not os.path.exists(path + '/min'):
+            os.makedirs(path + '/min')
         im.save(fname)
         os.remove(self.image.path)
         self.image = "%s.%s" % (hs, ext)

taskapp/migrations/0014_auto_20170416_1029.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9 on 2017-04-16 07:29
+from __future__ import unicode_literals
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('taskapp', '0013_auto_20170413_1944'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='task',
+            name='abon',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='abonapp.Abon'),
+        ),
+        migrations.AlterField(
+            model_name='task',
+            name='author',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='+', to=settings.AUTH_USER_MODEL),
+        ),
+    ]

taskapp/models.py

@@ -61,7 +61,7 @@ def _delta_add_days():
 class Task(models.Model):
     descr = models.CharField(max_length=128, null=True, blank=True)
     recipients = models.ManyToManyField(settings.AUTH_USER_MODEL, related_name='them_task')
-    author = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='+')
+    author = models.ForeignKey(settings.AUTH_USER_MODEL, related_name='+', on_delete=models.SET_NULL, null=True, blank=True)
     #device = models.ForeignKey(Device, related_name='dev')
     priority = models.CharField(max_length=1, choices=TASK_PRIORITIES, default=TASK_PRIORITIES[2][0])
     out_date = models.DateField(null=True, blank=True, default=_delta_add_days)
@@ -69,7 +69,7 @@ class Task(models.Model):
     state = models.CharField(max_length=1, choices=TASK_STATES, default=TASK_STATES[0][0])
     attachment = models.ImageField(upload_to='task_attachments/%Y.%m.%d', blank=True, null=True)
     mode = models.CharField(max_length=2, choices=TASK_TYPES, default=TASK_TYPES[0][0])
-    abon = models.ForeignKey(Abon, on_delete=models.SET_NULL, null=True, blank=True, related_name='+')
+    abon = models.ForeignKey(Abon, null=True, blank=True)
 
     class Meta:
         db_table = 'task'