django2.2: add default mandatory on_delete on all ForeignKey

accounting/models.py

@@ -110,7 +110,12 @@ class BankAccount(models.Model):
     name = models.CharField(_("name"), max_length=30)
     iban = models.CharField(_("iban"), max_length=255, blank=True)
     number = models.CharField(_("account number"), max_length=255, blank=True)
-    club = models.ForeignKey(Club, related_name="bank_accounts", verbose_name=_("club"))
+    club = models.ForeignKey(
+        Club,
+        related_name="bank_accounts",
+        verbose_name=_("club"),
+        on_delete=models.CASCADE,
+    )
 
     class Meta:
         verbose_name = _("Bank account")
@@ -136,9 +141,17 @@ class BankAccount(models.Model):
 
 class ClubAccount(models.Model):
     name = models.CharField(_("name"), max_length=30)
-    club = models.ForeignKey(Club, related_name="club_account", verbose_name=_("club"))
+    club = models.ForeignKey(
+        Club,
+        related_name="club_account",
+        verbose_name=_("club"),
+        on_delete=models.CASCADE,
+    )
     bank_account = models.ForeignKey(
-        BankAccount, related_name="club_accounts", verbose_name=_("bank account")
+        BankAccount,
+        related_name="club_accounts",
+        verbose_name=_("bank account"),
+        on_delete=models.CASCADE,
     )
 
     class Meta:
@@ -203,7 +216,11 @@ class GeneralJournal(models.Model):
     name = models.CharField(_("name"), max_length=40)
     closed = models.BooleanField(_("is closed"), default=False)
     club_account = models.ForeignKey(
-        ClubAccount, related_name="journals", null=False, verbose_name=_("club account")
+        ClubAccount,
+        related_name="journals",
+        null=False,
+        verbose_name=_("club account"),
+        on_delete=models.CASCADE,
     )
     amount = CurrencyField(_("amount"), default=0)
     effective_amount = CurrencyField(_("effective_amount"), default=0)
@@ -263,7 +280,11 @@ class Operation(models.Model):
 
     number = models.IntegerField(_("number"))
     journal = models.ForeignKey(
-        GeneralJournal, related_name="operations", null=False, verbose_name=_("journal")
+        GeneralJournal,
+        related_name="operations",
+        null=False,
+        verbose_name=_("journal"),
+        on_delete=models.CASCADE,
     )
     amount = CurrencyField(_("amount"))
     date = models.DateField(_("date"))
@@ -282,6 +303,7 @@ class Operation(models.Model):
         verbose_name=_("invoice"),
         null=True,
         blank=True,
+        on_delete=models.CASCADE,
     )
     done = models.BooleanField(_("is done"), default=False)
     simpleaccounting_type = models.ForeignKey(
@@ -290,6 +312,7 @@ class Operation(models.Model):
         verbose_name=_("simple type"),
         null=True,
         blank=True,
+        on_delete=models.CASCADE,
     )
     accounting_type = models.ForeignKey(
         "AccountingType",
@@ -297,6 +320,7 @@ class Operation(models.Model):
         verbose_name=_("accounting type"),
         null=True,
         blank=True,
+        on_delete=models.CASCADE,
     )
     label = models.ForeignKey(
         "Label",
@@ -487,6 +511,7 @@ class SimplifiedAccountingType(models.Model):
         AccountingType,
         related_name="simplified_types",
         verbose_name=_("simplified accounting types"),
+        on_delete=models.CASCADE,
     )
 
     class Meta:
@@ -518,7 +543,10 @@ class Label(models.Model):
 
     name = models.CharField(_("label"), max_length=64)
     club_account = models.ForeignKey(
-        ClubAccount, related_name="labels", verbose_name=_("club account")
+        ClubAccount,
+        related_name="labels",
+        verbose_name=_("club account"),
+        on_delete=models.CASCADE,
     )
 
     class Meta:

club/models.py

@@ -46,7 +46,9 @@ class Club(models.Model):
 
     id = models.AutoField(primary_key=True, db_index=True)
     name = models.CharField(_("name"), max_length=64)
-    parent = models.ForeignKey("Club", related_name="children", null=True, blank=True)
+    parent = models.ForeignKey(
+        "Club", related_name="children", null=True, blank=True, on_delete=models.CASCADE
+    )
     unix_name = models.CharField(
         _("unix name"),
         max_length=30,
@@ -75,7 +77,10 @@ class Club(models.Model):
         return settings.SITH_GROUP_ROOT_ID
 
     owner_group = models.ForeignKey(
-        Group, related_name="owned_club", default=get_default_owner_group
+        Group,
+        related_name="owned_club",
+        default=get_default_owner_group,
+        on_delete=models.CASCADE,
     )
     edit_groups = models.ManyToManyField(
         Group, related_name="editable_club", blank=True
@@ -261,9 +266,15 @@ class Membership(models.Model):
         related_name="memberships",
         null=False,
         blank=False,
+        on_delete=models.CASCADE,
     )
     club = models.ForeignKey(
-        Club, verbose_name=_("club"), related_name="members", null=False, blank=False
+        Club,
+        verbose_name=_("club"),
+        related_name="members",
+        null=False,
+        blank=False,
+        on_delete=models.CASCADE,
     )
     start_date = models.DateField(_("start date"), default=timezone.now)
     end_date = models.DateField(_("end date"), null=True, blank=True)
@@ -317,7 +328,12 @@ class Mailing(models.Model):
     """
 
     club = models.ForeignKey(
-        Club, verbose_name=_("Club"), related_name="mailings", null=False, blank=False
+        Club,
+        verbose_name=_("Club"),
+        related_name="mailings",
+        null=False,
+        blank=False,
+        on_delete=models.CASCADE,
     )
     email = models.CharField(
         _("Email address"),
@@ -334,7 +350,11 @@ class Mailing(models.Model):
     )
     is_moderated = models.BooleanField(_("is moderated"), default=False)
     moderator = models.ForeignKey(
-        User, related_name="moderated_mailings", verbose_name=_("moderator"), null=True
+        User,
+        related_name="moderated_mailings",
+        verbose_name=_("moderator"),
+        null=True,
+        on_delete=models.CASCADE,
     )
 
     def clean(self):
@@ -409,6 +429,7 @@ class MailingSubscription(models.Model):
         related_name="subscriptions",
         null=False,
         blank=False,
+        on_delete=models.CASCADE,
     )
     user = models.ForeignKey(
         User,
@@ -416,6 +437,7 @@ class MailingSubscription(models.Model):
         related_name="mailing_subscriptions",
         null=True,
         blank=True,
+        on_delete=models.CASCADE,
     )
     email = models.EmailField(_("Email address"), blank=False, null=False)
 

com/models.py

@@ -28,7 +28,7 @@ from django.db import models, transaction
 from django.db.models import Q
 from django.utils.translation import ugettext_lazy as _
 from django.utils import timezone
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 from django.conf import settings
 from django.contrib.staticfiles.templatetags.staticfiles import static
 from django.core.mail import EmailMultiAlternatives
@@ -71,13 +71,22 @@ class News(models.Model):
     type = models.CharField(
         _("type"), max_length=16, choices=NEWS_TYPES, default="EVENT"
     )
-    club = models.ForeignKey(Club, related_name="news", verbose_name=_("club"))
+    club = models.ForeignKey(
+        Club, related_name="news", verbose_name=_("club"), on_delete=models.CASCADE
+    )
     author = models.ForeignKey(
-        User, related_name="owned_news", verbose_name=_("author")
+        User,
+        related_name="owned_news",
+        verbose_name=_("author"),
+        on_delete=models.CASCADE,
     )
     is_moderated = models.BooleanField(_("is moderated"), default=False)
     moderator = models.ForeignKey(
-        User, related_name="moderated_news", verbose_name=_("moderator"), null=True
+        User,
+        related_name="moderated_news",
+        verbose_name=_("moderator"),
+        null=True,
+        on_delete=models.CASCADE,
     )
 
     def is_owned_by(self, user):
@@ -138,7 +147,12 @@ class NewsDate(models.Model):
     we don't have to make copies
     """
 
-    news = models.ForeignKey(News, related_name="dates", verbose_name=_("news_date"))
+    news = models.ForeignKey(
+        News,
+        related_name="dates",
+        verbose_name=_("news_date"),
+        on_delete=models.CASCADE,
+    )
     start_date = models.DateTimeField(_("start_date"), null=True, blank=True)
     end_date = models.DateTimeField(_("end_date"), null=True, blank=True)
 
@@ -230,15 +244,25 @@ class Weekmail(models.Model):
 
 class WeekmailArticle(models.Model):
     weekmail = models.ForeignKey(
-        Weekmail, related_name="articles", verbose_name=_("weekmail"), null=True
+        Weekmail,
+        related_name="articles",
+        verbose_name=_("weekmail"),
+        null=True,
+        on_delete=models.CASCADE,
     )
     title = models.CharField(_("title"), max_length=64)
     content = models.TextField(_("content"))
     author = models.ForeignKey(
-        User, related_name="owned_weekmail_articles", verbose_name=_("author")
+        User,
+        related_name="owned_weekmail_articles",
+        verbose_name=_("author"),
+        on_delete=models.CASCADE,
     )
     club = models.ForeignKey(
-        Club, related_name="weekmail_articles", verbose_name=_("club")
+        Club,
+        related_name="weekmail_articles",
+        verbose_name=_("club"),
+        on_delete=models.CASCADE,
     )
     rank = models.IntegerField(_("rank"), default=-1)
 
@@ -271,7 +295,11 @@ class Poster(models.Model):
     )
     file = models.ImageField(_("file"), null=False, upload_to="com/posters")
     club = models.ForeignKey(
-        Club, related_name="posters", verbose_name=_("club"), null=False
+        Club,
+        related_name="posters",
+        verbose_name=_("club"),
+        null=False,
+        on_delete=models.CASCADE,
     )
     screens = models.ManyToManyField(Screen, related_name="posters")
     date_begin = models.DateTimeField(blank=False, null=False, default=timezone.now)
@@ -286,6 +314,7 @@ class Poster(models.Model):
         verbose_name=_("moderator"),
         null=True,
         blank=True,
+        on_delete=models.CASCADE,
     )
 
     def save(self, *args, **kwargs):

core/models.py

@@ -743,7 +743,9 @@ class AnonymousUser(AuthAnonymousUser):
 
 
 class Preferences(models.Model):
-    user = models.OneToOneField(User, related_name="_preferences")
+    user = models.OneToOneField(
+        User, related_name="_preferences", on_delete=models.CASCADE
+    )
     receive_weekmail = models.BooleanField(
         _("do you want to receive the weekmail"), default=False
     )
@@ -777,7 +779,12 @@ def get_thumbnail_directory(instance, filename):
 class SithFile(models.Model):
     name = models.CharField(_("file name"), max_length=256, blank=False)
     parent = models.ForeignKey(
-        "self", related_name="children", verbose_name=_("parent"), null=True, blank=True
+        "self",
+        related_name="children",
+        verbose_name=_("parent"),
+        null=True,
+        blank=True,
+        on_delete=models.CASCADE,
     )
     file = models.FileField(
         upload_to=get_directory,
@@ -800,7 +807,12 @@ class SithFile(models.Model):
         null=True,
         blank=True,
     )
-    owner = models.ForeignKey(User, related_name="owned_files", verbose_name=_("owner"))
+    owner = models.ForeignKey(
+        User,
+        related_name="owned_files",
+        verbose_name=_("owner"),
+        on_delete=models.CASCADE,
+    )
     edit_groups = models.ManyToManyField(
         Group, related_name="editable_files", verbose_name=_("edit group"), blank=True
     )
@@ -818,6 +830,7 @@ class SithFile(models.Model):
         verbose_name=_("owner"),
         null=True,
         blank=True,
+        on_delete=models.CASCADE,
     )
     asked_for_removal = models.BooleanField(_("asked for removal"), default=False)
     is_in_sas = models.BooleanField(
@@ -1133,6 +1146,7 @@ class Page(models.Model):
         related_name="owned_page",
         verbose_name=_("owner group"),
         default=get_default_owner_group,
+        on_delete=models.CASCADE,
     )
     edit_groups = models.ManyToManyField(
         Group, related_name="editable_page", verbose_name=_("edit group"), blank=True
@@ -1147,6 +1161,7 @@ class Page(models.Model):
         blank=True,
         null=True,
         default=None,
+        on_delete=models.CASCADE,
     )
     lock_timeout = models.DateTimeField(
         _("lock_timeout"), null=True, blank=True, default=None
@@ -1347,8 +1362,8 @@ class PageRev(models.Model):
     title = models.CharField(_("page title"), max_length=255, blank=True)
     content = models.TextField(_("page content"), blank=True)
     date = models.DateTimeField(_("date"), auto_now=True)
-    author = models.ForeignKey(User, related_name="page_rev")
-    page = models.ForeignKey(Page, related_name="revisions")
+    author = models.ForeignKey(User, related_name="page_rev", on_delete=models.CASCADE)
+    page = models.ForeignKey(Page, related_name="revisions", on_delete=models.CASCADE)
 
     class Meta:
         ordering = ["date"]
@@ -1386,7 +1401,9 @@ class PageRev(models.Model):
 
 
 class Notification(models.Model):
-    user = models.ForeignKey(User, related_name="notifications")
+    user = models.ForeignKey(
+        User, related_name="notifications", on_delete=models.CASCADE
+    )
     url = models.CharField(_("url"), max_length=255)
     param = models.CharField(_("param"), max_length=128, default="")
     type = models.CharField(
@@ -1422,7 +1439,7 @@ class Notification(models.Model):
 class Gift(models.Model):
     label = models.CharField(_("label"), max_length=255)
     date = models.DateTimeField(_("date"), default=timezone.now)
-    user = models.ForeignKey(User, related_name="gifts")
+    user = models.ForeignKey(User, related_name="gifts", on_delete=models.CASCADE)
 
     def __str__(self):
         return "%s - %s" % (self.translated_label, self.date.strftime("%d %b %Y"))

counter/models.py

@@ -163,7 +163,9 @@ class Product(models.Model):
     icon = models.ImageField(
         upload_to="products", null=True, blank=True, verbose_name=_("icon")
     )
-    club = models.ForeignKey(Club, related_name="products", verbose_name=_("club"))
+    club = models.ForeignKey(
+        Club, related_name="products", verbose_name=_("club"), on_delete=models.CASCADE
+    )
     limit_age = models.IntegerField(_("limit age"), default=0)
     tray = models.BooleanField(_("tray price"), default=False)
     parent_product = models.ForeignKey(
@@ -209,7 +211,9 @@ class Product(models.Model):
 
 class Counter(models.Model):
     name = models.CharField(_("name"), max_length=30)
-    club = models.ForeignKey(Club, related_name="counters", verbose_name=_("club"))
+    club = models.ForeignKey(
+        Club, related_name="counters", verbose_name=_("club"), on_delete=models.CASCADE
+    )
     products = models.ManyToManyField(
         Product, related_name="counters", verbose_name=_("products"), blank=True
     )
@@ -344,12 +348,19 @@ class Refilling(models.Model):
     Handle the refilling
     """
 
-    counter = models.ForeignKey(Counter, related_name="refillings", blank=False)
+    counter = models.ForeignKey(
+        Counter, related_name="refillings", blank=False, on_delete=models.CASCADE
+    )
     amount = CurrencyField(_("amount"))
     operator = models.ForeignKey(
-        User, related_name="refillings_as_operator", blank=False
+        User,
+        related_name="refillings_as_operator",
+        blank=False,
+        on_delete=models.CASCADE,
+    )
+    customer = models.ForeignKey(
+        Customer, related_name="refillings", blank=False, on_delete=models.CASCADE
     )
-    customer = models.ForeignKey(Customer, related_name="refillings", blank=False)
     date = models.DateTimeField(_("date"))
     payment_method = models.CharField(
         _("payment method"),
@@ -584,9 +595,17 @@ class Permanency(models.Model):
     This class aims at storing a traceability of who was barman where and when
     """
 
-    user = models.ForeignKey(User, related_name="permanencies", verbose_name=_("user"))
+    user = models.ForeignKey(
+        User,
+        related_name="permanencies",
+        verbose_name=_("user"),
+        on_delete=models.CASCADE,
+    )
     counter = models.ForeignKey(
-        Counter, related_name="permanencies", verbose_name=_("counter")
+        Counter,
+        related_name="permanencies",
+        verbose_name=_("counter"),
+        on_delete=models.CASCADE,
     )
     start = models.DateTimeField(_("start date"))
     end = models.DateTimeField(_("end date"), null=True, db_index=True)
@@ -607,10 +626,16 @@ class Permanency(models.Model):
 
 class CashRegisterSummary(models.Model):
     user = models.ForeignKey(
-        User, related_name="cash_summaries", verbose_name=_("user")
+        User,
+        related_name="cash_summaries",
+        verbose_name=_("user"),
+        on_delete=models.CASCADE,
     )
     counter = models.ForeignKey(
-        Counter, related_name="cash_summaries", verbose_name=_("counter")
+        Counter,
+        related_name="cash_summaries",
+        verbose_name=_("counter"),
+        on_delete=models.CASCADE,
     )
     date = models.DateTimeField(_("date"))
     comment = models.TextField(_("comment"), null=True, blank=True)
@@ -683,7 +708,10 @@ class CashRegisterSummary(models.Model):
 
 class CashRegisterSummaryItem(models.Model):
     cash_summary = models.ForeignKey(
-        CashRegisterSummary, related_name="items", verbose_name=_("cash summary")
+        CashRegisterSummary,
+        related_name="items",
+        verbose_name=_("cash summary"),
+        on_delete=models.CASCADE,
     )
     value = CurrencyField(_("value"))
     quantity = models.IntegerField(_("quantity"), default=0)
@@ -772,4 +800,5 @@ class StudentCard(models.Model):
         verbose_name=_("student cards"),
         null=False,
         blank=False,
+        on_delete=models.CASCADE,
     )

eboutic/models.py

@@ -37,7 +37,11 @@ class Basket(models.Model):
     """
 
     user = models.ForeignKey(
-        User, related_name="baskets", verbose_name=_("user"), blank=False
+        User,
+        related_name="baskets",
+        verbose_name=_("user"),
+        blank=False,
+        on_delete=models.CASCADE,
     )
     date = models.DateTimeField(_("date"), auto_now=True)
 
@@ -80,7 +84,11 @@ class Invoice(models.Model):
     """
 
     user = models.ForeignKey(
-        User, related_name="invoices", verbose_name=_("user"), blank=False
+        User,
+        related_name="invoices",
+        verbose_name=_("user"),
+        blank=False,
+        on_delete=models.CASCADE,
     )
     date = models.DateTimeField(_("date"), auto_now=True)
     validated = models.BooleanField(_("validated"), default=False)
@@ -158,10 +166,15 @@ class AbstractBaseItem(models.Model):
 
 
 class BasketItem(AbstractBaseItem):
-    basket = models.ForeignKey(Basket, related_name="items", verbose_name=_("basket"))
+    basket = models.ForeignKey(
+        Basket, related_name="items", verbose_name=_("basket"), on_delete=models.CASCADE
+    )
 
 
 class InvoiceItem(AbstractBaseItem):
     invoice = models.ForeignKey(
-        Invoice, related_name="items", verbose_name=_("invoice")
+        Invoice,
+        related_name="items",
+        verbose_name=_("invoice"),
+        on_delete=models.CASCADE,
     )

election/models.py

@@ -111,7 +111,10 @@ class Role(OrderedModel):
     """
 
     election = models.ForeignKey(
-        Election, related_name="roles", verbose_name=_("election")
+        Election,
+        related_name="roles",
+        verbose_name=_("election"),
+        on_delete=models.CASCADE,
     )
     title = models.CharField(_("title"), max_length=255)
     description = models.TextField(_("description"), null=True, blank=True)
@@ -155,7 +158,10 @@ class ElectionList(models.Model):
 
     title = models.CharField(_("title"), max_length=255)
     election = models.ForeignKey(
-        Election, related_name="election_lists", verbose_name=_("election")
+        Election,
+        related_name="election_lists",
+        verbose_name=_("election"),
+        on_delete=models.CASCADE,
     )
 
     def can_be_edited_by(self, user):
@@ -175,13 +181,25 @@ class Candidature(models.Model):
     This class is a component of responsability
     """
 
-    role = models.ForeignKey(Role, related_name="candidatures", verbose_name=_("role"))
+    role = models.ForeignKey(
+        Role,
+        related_name="candidatures",
+        verbose_name=_("role"),
+        on_delete=models.CASCADE,
+    )
     user = models.ForeignKey(
-        User, verbose_name=_("user"), related_name="candidates", blank=True
+        User,
+        verbose_name=_("user"),
+        related_name="candidates",
+        blank=True,
+        on_delete=models.CASCADE,
     )
     program = models.TextField(_("description"), null=True, blank=True)
     election_list = models.ForeignKey(
-        ElectionList, related_name="candidatures", verbose_name=_("election list")
+        ElectionList,
+        related_name="candidatures",
+        verbose_name=_("election list"),
+        on_delete=models.CASCADE,
     )
 
     def delete(self):
@@ -201,7 +219,9 @@ class Vote(models.Model):
     This class allows to vote for candidates
     """
 
-    role = models.ForeignKey(Role, related_name="votes", verbose_name=_("role"))
+    role = models.ForeignKey(
+        Role, related_name="votes", verbose_name=_("role"), on_delete=models.CASCADE
+    )
     candidature = models.ManyToManyField(
         Candidature, related_name="votes", verbose_name=_("candidature")
     )

forum/models.py

@@ -58,12 +58,19 @@ class Forum(models.Model):
     name = models.CharField(_("name"), max_length=64)
     description = models.CharField(_("description"), max_length=512, default="")
     is_category = models.BooleanField(_("is a category"), default=False)
-    parent = models.ForeignKey("Forum", related_name="children", null=True, blank=True)
+    parent = models.ForeignKey(
+        "Forum",
+        related_name="children",
+        null=True,
+        blank=True,
+        on_delete=models.CASCADE,
+    )
     owner_club = models.ForeignKey(
         Club,
         related_name="owned_forums",
         verbose_name=_("owner club"),
         default=settings.SITH_MAIN_CLUB_ID,
+        on_delete=models.CASCADE,
     )
     edit_groups = models.ManyToManyField(
         Group,
@@ -226,8 +233,10 @@ class Forum(models.Model):
 
 
 class ForumTopic(models.Model):
-    forum = models.ForeignKey(Forum, related_name="topics")
-    author = models.ForeignKey(User, related_name="forum_topics")
+    forum = models.ForeignKey(Forum, related_name="topics", on_delete=models.CASCADE)
+    author = models.ForeignKey(
+        User, related_name="forum_topics", on_delete=models.CASCADE
+    )
     description = models.CharField(_("description"), max_length=256, default="")
     subscribed_users = models.ManyToManyField(
         User, related_name="favorite_topics", verbose_name=_("subscribed users")
@@ -291,8 +300,12 @@ class ForumMessage(models.Model):
     "A ForumMessage object represents a message in the forum" -- Cpt. Obvious
     """
 
-    topic = models.ForeignKey(ForumTopic, related_name="messages")
-    author = models.ForeignKey(User, related_name="forum_messages")
+    topic = models.ForeignKey(
+        ForumTopic, related_name="messages", on_delete=models.CASCADE
+    )
+    author = models.ForeignKey(
+        User, related_name="forum_messages", on_delete=models.CASCADE
+    )
     title = models.CharField(_("title"), default="", max_length=64, blank=True)
     message = models.TextField(_("message"), default="")
     date = models.DateTimeField(_("date"), default=timezone.now)
@@ -386,8 +399,12 @@ MESSAGE_META_ACTIONS = [
 
 
 class ForumMessageMeta(models.Model):
-    user = models.ForeignKey(User, related_name="forum_message_metas")
-    message = models.ForeignKey(ForumMessage, related_name="metas")
+    user = models.ForeignKey(
+        User, related_name="forum_message_metas", on_delete=models.CASCADE
+    )
+    message = models.ForeignKey(
+        ForumMessage, related_name="metas", on_delete=models.CASCADE
+    )
     date = models.DateTimeField(_("date"), default=timezone.now)
     action = models.CharField(_("action"), choices=MESSAGE_META_ACTIONS, max_length=16)
 

launderette/models.py

@@ -89,7 +89,10 @@ class Launderette(models.Model):
 class Machine(models.Model):
     name = models.CharField(_("name"), max_length=30)
     launderette = models.ForeignKey(
-        Launderette, related_name="machines", verbose_name=_("launderette")
+        Launderette,
+        related_name="machines",
+        verbose_name=_("launderette"),
+        on_delete=models.CASCADE,
     )
     type = models.CharField(
         _("type"), max_length=10, choices=settings.SITH_LAUNDERETTE_MACHINE_TYPES
@@ -124,14 +127,22 @@ class Machine(models.Model):
 class Token(models.Model):
     name = models.CharField(_("name"), max_length=5)
     launderette = models.ForeignKey(
-        Launderette, related_name="tokens", verbose_name=_("launderette")
+        Launderette,
+        related_name="tokens",
+        verbose_name=_("launderette"),
+        on_delete=models.CASCADE,
     )
     type = models.CharField(
         _("type"), max_length=10, choices=settings.SITH_LAUNDERETTE_MACHINE_TYPES
     )
     borrow_date = models.DateTimeField(_("borrow date"), null=True, blank=True)
     user = models.ForeignKey(
-        User, related_name="tokens", verbose_name=_("user"), null=True, blank=True
+        User,
+        related_name="tokens",
+        verbose_name=_("user"),
+        null=True,
+        blank=True,
+        on_delete=models.CASCADE,
     )
 
     class Meta:
@@ -182,12 +193,22 @@ class Slot(models.Model):
         _("type"), max_length=10, choices=settings.SITH_LAUNDERETTE_MACHINE_TYPES
     )
     machine = models.ForeignKey(
-        Machine, related_name="slots", verbose_name=_("machine")
+        Machine,
+        related_name="slots",
+        verbose_name=_("machine"),
+        on_delete=models.CASCADE,
     )
     token = models.ForeignKey(
-        Token, related_name="slots", verbose_name=_("token"), blank=True, null=True
+        Token,
+        related_name="slots",
+        verbose_name=_("token"),
+        blank=True,
+        null=True,
+        on_delete=models.CASCADE,
+    )
+    user = models.ForeignKey(
+        User, related_name="slots", verbose_name=_("user"), on_delete=models.CASCADE
     )
-    user = models.ForeignKey(User, related_name="slots", verbose_name=_("user"))
 
     class Meta:
         verbose_name = _("Slot")

pedagogy/models.py

@@ -61,6 +61,7 @@ class UV(models.Model):
         verbose_name=_("author"),
         null=False,
         blank=False,
+        on_delete=models.CASCADE,
     )
     credit_type = models.CharField(
         _("credit type"),
@@ -210,8 +211,11 @@ class UVComment(models.Model):
         verbose_name=_("author"),
         null=False,
         blank=False,
+        on_delete=models.CASCADE,
+    )
+    uv = models.ForeignKey(
+        UV, related_name="comments", verbose_name=_("uv"), on_delete=models.CASCADE
     )
-    uv = models.ForeignKey(UV, related_name="comments", verbose_name=_("uv"))
     comment = models.TextField(_("comment"), blank=True)
     grade_global = models.IntegerField(
         _("global grade"),
@@ -283,8 +287,12 @@ class UVResult(models.Model):
              a semester (P/A)20xx
     """
 
-    uv = models.ForeignKey(UV, related_name="results", verbose_name=_("uv"))
-    user = models.ForeignKey(User, related_name="uv_results", verbose_name=("user"))
+    uv = models.ForeignKey(