Finetuned on_delete settings

contour/models.py

@@ -41,7 +41,7 @@ class Venue(models.Model):
 class Image(models.Model):
   published = models.BooleanField(default=False)
   oldImage = models.ImageField(upload_to="images", null=True, blank=True)
-  image = FilerImageField(null=True, blank=True, on_delete=models.PROTECT)
+  image = FilerImageField(null=True, blank=True, on_delete=models.CASCADE)
   title_nl = models.CharField(max_length=255)
   tagline_nl = models.CharField(max_length=255, null=True, blank=True)
   title_en = models.CharField(max_length=255, verbose_name="Title (English)", null=True, blank=True)
@@ -153,8 +153,8 @@ class Event(models.Model):
   published = models.BooleanField(default=True)
   continuous = models.BooleanField(default=False)
   project = models.ForeignKey(Project, on_delete=models.CASCADE)
-  event_type = models.ForeignKey(EventType, on_delete=models.PROTECT)
-  venue = models.ForeignKey(Venue, on_delete=models.PROTECT)
+  event_type = models.ForeignKey(EventType, on_delete=models.SET_NULL, null=True)
+  venue = models.ForeignKey(Venue, on_delete=models.SET_NULL, null=True)
   notes_nl = models.TextField(null=True, blank=True)
   notes_en = models.TextField(verbose_name="Notes (English)", null=True, blank=True)
   start = models.DateTimeField()
@@ -216,8 +216,8 @@ class ProjectParticipant(models.Model):
   def __str__ (self):
     return self.participant.__str__()
 
-  participant = models.ForeignKey(Participant, on_delete=models.PROTECT)
-  project = SortableForeignKey(Project, on_delete=models.PROTECT)
+  participant = models.ForeignKey(Participant, on_delete=models.CASCADE)
+  project = SortableForeignKey(Project, on_delete=models.CASCADE)
   role_nl = models.CharField(max_length=255)
   role_en = models.CharField(max_length=255, verbose_name="Role (English)")
   position = models.PositiveIntegerField(default=0, editable=True, db_index=True)
@@ -243,8 +243,8 @@ class ProjectImage(models.Model):
   class Meta:
     ordering = ('position',)
 
-  project = SortableForeignKey(Project, on_delete=models.PROTECT)
-  image = models.ForeignKey(Image, on_delete=models.PROTECT)
+  project = SortableForeignKey(Project, on_delete=models.CASCADE)
+  image = models.ForeignKey(Image, on_delete=models.CASCADE)
   position = models.PositiveIntegerField(default=0, editable=True, db_index=True)
   cover_image = models.BooleanField(default=True)
   
@@ -253,8 +253,8 @@ class ProjectImage(models.Model):
 
 
 class ProjectPad(models.Model):
-  project = models.ForeignKey(Project, on_delete=models.PROTECT)
-  pad = models.ForeignKey(Pad, on_delete=models.PROTECT)
+  project = models.ForeignKey(Project, on_delete=models.CASCADE)
+  pad = models.ForeignKey(Pad, on_delete=models.CASCADE)
   position = models.PositiveIntegerField(default=0, editable=True, db_index=True)
   
   def __getattr__ (self, attrname):
@@ -281,7 +281,7 @@ class Page(models.Model):
   title_en = models.CharField(max_length=255, verbose_name="Title (English)", null=True, blank=True)
   summary_en = models.TextField(null=True, blank=True, verbose_name="Summary (English) shown on parent page")
   content_en = models.TextField(verbose_name="Content (English)", null=True, blank=True)
-  parent = models.ForeignKey('Page', on_delete=models.CASCADE, related_name='subpage', null=True, blank=True)
+  parent = models.ForeignKey('Page', on_delete=models.SET_NULL, related_name='subpage', null=True, blank=True)
 
   def __str__ (self):
     return '{}'.format(self.title)
@@ -318,7 +318,7 @@ class Loop(models.Model):
   published = models.BooleanField(default=False)
   description_nl = models.TextField(verbose_name="Description (Dutch)", null=True, blank=True)
   description_en = models.TextField(verbose_name="Description (English)", null=True, blank=True)
-  page = models.ForeignKey(Page, on_delete=models.CASCADE, related_name='loop', null=True, blank=True)
+  page = models.ForeignKey(Page, on_delete=models.SET_NULL, related_name='loop', null=True, blank=True)
 
   def __str__ (self):
     return '{}'.format(self.name)